- l4-hackers - example.com Site

Fiasco.OC port on Jailhouse
by Muneeswaran Rajendran 19 Dec '17

19 Dec '17

Hi, I trying to understand the porting of fiasco.OC kernel into jailhouse but not able locate the source code of jailhouse porting code for fiasco.OC kernel. Please share the same. I refer this below document to get 'jailhouse/configs/fiasco-demo.c' this file. But i do not find it. https://rtime.felk.cvut.cz/~sojka/students/F3-BP-2016-Baryshnikov-Maxim-bar… Please help me out to find out. Regards, Munees

1 0

exception while running L4linux on raspberry pi 2
by vmc doe 17 Dec '17

17 Dec '17

Hi Adam/l4-hackers, I tried to build l4+l4Re+l4linux for raspberry pi 2. The build was successful, but when I tried to run this in qemu I am getting the following error. Could you pls help me to fix this error? I am new to L4 and L4Re and would like to try out some virtualization options with L4 Microkernel. Could you pls suggest some initial modules or portions where I can start with. Regards vmc L4 Bootstrapper Build: #3 Mon Dec 11 15:24:01 IST 2017, 4.8.3 20140303 (prerelease) Scanning up to 512 MB RAM, starting at offset 32MB Memory size is 512MB (00000000 - 1fffffff) RAM: 0000000000000000 - 000000001fffffff: 524288kB Total RAM: 512MB Scanning fiasco Scanning sigma0 Scanning moe Moving up to 8 modules behind 1100000 moving module 02 { 1823000-18544df } -> { 1914000-19454df } [201952] moving module 01 { 1811000-1822373 } -> { 1902000-1913373 } [70516] moving module 00 { 1786000-1810e23 } -> { 1877000-1901e23 } [568868] moving module 07 { 1486000-1785fff } -> { 1577000-1876fff } [3145728] moving module 06 { 108c000-148547f } -> { 117d000-157647f } [4166784] moving module 05 { 102a000-108b717 } -> { 111b000-117c717 } [399128] moving module 04 { 1010000-10294a3 } -> { 1101000-111a4a3 } [103588] moving module 03 { 100f000-100f12d } -> { 1100000-110012d } [302] Loading fiasco Loading sigma0 Loading moe find kernel info page... found kernel info page (via ELF) at 2000 Regions of list 'regions' [ 1000, 1a3f] { a40} Kern fiasco [ 2000, 9afff] { 99000} Kern fiasco [ 9b000, 9b137] { 138} Root mbi_rt [ e0000, e9ec3] { 9ec4} Sigma0 sigma0 [ f0000, f6177] { 6178} Sigma0 sigma0 [ 140000, 169e37] { 29e38} Root moe [ 170000, 18242b] { 1242c} Root moe [ 1000000, 100e573] { e574} Boot bootstrap [ 1100000, 1876fff] { 777000} Root Module found kernel options (via ELF) at 3000 Sigma0 config ip:000e0100 sp:00000000 Roottask config ip:00140250 sp:00000000 Starting kernel fiasco at 0000120c Hello from Startup::stage2 ARM generic timer: freq=62500000 interval=62500 cnt=5558234 SERIAL ESC: allocated IRQ 57 for serial uart Not using serial hack in slow timer handler. Welcome to L4/Fiasco.OC! L4/Fiasco.OC microkernel on arm Rev: unknown compiled with gcc 4.8.3 20140303 (prerelease) for Broadcom 2836 [] Build: #2 Mon Dec 11 14:06:49 IST 2017 Calibrating timer loop... done. MDB: use page size: 20 MDB: use page size: 12 SIGMA0: Hello! KIP @ 2000 allocated 4KB for maintenance structures SIGMA0: Dump of all resource maps RAM:------------------------ [0:0;fff] [4:9b000;9bfff] [0:9c000;dffff] [0:ea000;effff] [0:f7000;13ffff] [4:140000;169fff] [0:16a000;16ffff] [4:170000;182fff] [0:183000;10fffff] [4:1100000;1876fff] [0:1877000;1effffff] IOMEM:---------------------- [0:20000000;ffffffff] MOE: Hello world MOE: found 499336 KByte free memory MOE: found RAM from 9b000 to 1f000000 MOE: allocated 495 KByte for the page array @0x183000 MOE: virtual user address space [0-bfffffff] MOE: rom name space cap -> [C:103000] MOE: rwfs name space cap -> [C:105000] BOOTFS: [1100000-110012e] [C:107000] l4lx.cfg BOOTFS: [1101000-111a4a4] [C:109000] l4re BOOTFS: [111b000-117c718] [C:10b000] ned BOOTFS: [117d000-1576480] [C:10d000] vmlinuz BOOTFS: [1577000-1877000] [C:10f000] ramdisk-arm.rd MOE: cmdline: moe rom/l4lx.cfg MOE: Starting: rom/ned rom/l4lx.cfg MOE: loading 'rom/ned' Ned says: Hi World! L4Re: unhandled exception: pc=0x1029198 (pfa=205a48) L4Re: Global::l4re_aux->ldr_flags=0

2 1

Trying l4re-snapshot-17.10 on a Wanboard(iMX6Q) hangs at Starting kernel ...
by Sathish Kumar Balasubramaniam -ERS, HCL Tech 17 Dec '17

17 Dec '17

Build machine is Debian 8.10 (jessie) 64-Bit GCC toolchain is gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf I tried to build the l4re-snapshot-17.10 for Freescale iMX6 and the build completed. When i loaded the bootstrap.uimage (both hello and L4Linux-basic) boots till the following U-Boot 2016.11+fslc+gc44711d (Nov 15 2017 - 16:14:11 +0530) CPU: Freescale i.MX6Q rev1.2 at 792 MHz Reset cause: POR Board: Wandboard rev C1 I2C: ready DRAM: 2 GiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 *** Warning - bad CRC, using default environment auto-detected panel HDMI Display: HDMI (1024x768) In: serial Out: serial Err: serial Net: FEC [PRIME] Hit any key to stop autoboot: 0 => ext4load mmc 0 ${loadaddr} /boot/bootstrap.uimage 8790080 bytes read in 628 ms (13.3 MiB/s) => bootm ${loadaddr} ## Booting kernel from Legacy Image at 12000000 ... Image Name: L4 Image #2 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 8790016 Bytes = 8.4 MiB Load Address: 11000000 Entry Point: 11000000 Verifying Checksum ... OK Loading Kernel Image ... OK Starting kernel ... I have a JTAG BDI-3000 with Cortex-A9 license. Any ideas how to debug the issue ??? ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ---------------------------------------------------------------------------------------------------------------------------------------------------- ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ----------------------------------------------------------------------------------------------------------------------------------------------------

2 1

Re: Add network device to L4Linux
by Yiyang Su 28 Nov '17

28 Nov '17

Hi, Thanks so much for your explanation. Now the L4Linux has access to the network and SD card. The problem was that in order to access these two device in Cubietruck, additional hardware devices must also be provided for L4Linux such as clock source, pin control (pinctrl), power management unit and direct memory access (dma) . To add the required drivers for all hardware devices i have modified some Kconfig and Makefile of L4Linux. Furthermore at the moment Two L4Linux are running and can communicate each other via shmn. I would like to configure as that one L4Linux (call it L1 here) is only allowed to access network device and another one (L2) is only allowed to access SD card device. Now i am struggling how can i provide the right ".io" file for the vbus. First, L1 and L2 require their own devices such as """ Io.add_vbus("l4linux_1", Io.Vi.System_bus { gmacclk = wrap(Hw.GMACTX); miiclk = wrap(Hw.MII); gmacint = wrap(Hw.GMACINT); ethernet = wrap(Hw.NIC); }) Io.add_vbus("l4linux_2", Io.Vi.System_bus { mmc0clk = wrap(Hw.MMC0CLK); regachi5v = wrap(Hw.ACHI5V); regv3v3 = wrap(Hw.V3V3); mmc0 = wrap(Hw.MMC0); }) """ But L1 and L2 still require other common devices such as pinctrl, dma, clk, etc. Here comes the problem, i cannot write the ".io" file like this """ Io.add_vbus("l4linux_1", Io.Vi.System_bus { osc24mclk = wrap(Hw.OSC24M); ahbclk = wrap(Hw.AHB); apb0clk = wrap(Hw.APB0); pinctrl = wrap(Hw.PIO); dmac = wrap(Hw.DMA); gmacclk = wrap(Hw.GMACTX); miiclk = wrap(Hw.MII); gmacint = wrap(Hw.GMACINT); ethernet = wrap(Hw.NIC); }) Io.add_vbus("l4linux_2", Io.Vi.System_bus { osc24mclk = wrap(Hw.OSC24M); ahbclk = wrap(Hw.AHB); apb0clk = wrap(Hw.APB0); pinctrl = wrap(Hw.PIO); dmac = wrap(Hw.DMA); mmc0clk = wrap(Hw.MMC0CLK); regachi5v = wrap(Hw.ACHI5V); regv3v3 = wrap(Hw.V3V3); mmc0 = wrap(Hw.MMC0); }) """ and to boot two L4Linux as: """ loader:start( { caps = { icu = L4.Env.icu, sigma0 = L4.cast(L4.Proto.Factory, L4.Env.sigma0):create(L4.Proto.Sigma0), input = vbus_input:svr(), general = vbus_general:svr(), l4linux_1 = vbus_l4linux_1:svr(), l4linux_2 = vbus_l4linux_2:svr(), }, log = {"IO", "y"}, l4re_dbg = L4.Dbg.Warn, }, "rom/io -vvv rom/l4lx-net-cubi-two.devs rom/l4lx-net-cubi-two.io" ); -- start L4Linux 1 loader:start( { caps = { vbus = vbus_l4linux_1, shmns = shmns:mode("rw"), }, .... } ); -- start L4Linux 2 loader:start( { caps = { vbus = vbus_l4linux_2, shmns = shmns:mode("rw"), }, .... } ); """ There will be conflicting virtual clients because of the two times assignments of the same device to the vbus and the two L4Linux won't be booted. I am stuck here and thinking about to implement a driver server, but don't know if it is the right direction. Any suggestions would be greatly appreciated. Yang

2 1

Porting Fiasco + L4Re to Raspberry Pi 2
by Antoine DEBUT 26 Nov '17

26 Nov '17

Hello l4-hackers, I am currently working on porting the Fiasco.OC micro kernel onto the Raspberry pi 2. Therefore, I am struggling with memory mapping, and I encounter the following error when launching the default 'hello' entry: L4 Bootstrapper Build: #2 Tue Feb 23 11:57:19 CET 2016, 4.8.3 20140303 (prerelease) Scanning up to 1024 MB RAM, starting at offset 32MB Memory size is 1024MB (00000000 - 3fffffff) RAM: 0000000000000000 - 000000003fffffff: 1048576kB Total RAM: 1024MB Scanning fiasco Scanning sigma0 Scanning moe Moving up to 5 modules behind 1100000 moving module 02 { 10db000-110c4d7 } -> { 11cc000-11fd4d7 } [201944] moving module 01 { 10c9000-10da373 } -> { 11ba000-11cb373 } [70516] moving module 00 { 1043000-10c889f } -> { 1134000-11b989f } [546976] moving module 04 { 1029000-10425af } -> { 111a000-11335af } [103856] moving module 03 { 100f000-102849b } -> { 1100000-111949b } [103580] Loading fiasco Loading sigma0 Loading moe find kernel info page... found kernel info page at 0x2000 Regions of list 'regions' [ 1000, 1aff] { b00} Kern fiasco [ 2000, 92fff] { 91000} Kern fiasco [ 93000, 930eb] { ec} Root mbi_rt [ c0000, c9c33] { 9c34} Sigma0 sigma0 [ d0000, d6177] { 6178} Sigma0 sigma0 [ 140000, 16905b] { 2905c} Root moe [ 170000, 17b58b] { b58c} Root moe [ 1000000, 100e4ff] { e500} Boot bootstrap [ 1100000, 1133fff] { 34000} Root Module API Version: (87) experimental Sigma0 config ip:000c0100 sp:00000000 Roottask config ip:00140250 sp:00000000 Starting kernel fiasco at 000012b8 Non-HYP kernel detected but running in HYP mode, switching back. Hello from Startup::stage2 Assertion failed at /home/adebut/Documents/snapshotTest/l4re-snapshot-2015123115/src/kernel/fiasco/src/kern/buddy_alloc.cpp:101: (unsigned long)block >= _base Press any key to reboot. I am currently working on the latest snapshot (2015123115), with U-Boot as a bootloader, and testing on a real board (Raspberry Pi 2 model B V1.1). The entry built is the standard 'hello', and I use the ramdisk-arm.rd given in the snapshot. I did add a custom Bsp for the board, mainly based on the first Raspberry Pi except for the Base Address, that is 0x3F000000 instead of the first Pi's 0x20000000. I highly think that it is an address configuration problem, because it first happened when I did expand the RAM size to 1024MB. With further investigation, I found out that it was the kernel memory allocation that causes this error, and suspect an incorrect MMU mapping. This suspicion comes from the fact that the assertion takes the address _base (0xf0400000) and the currently allocated block (0xee100000). I did not modify any parameter in the kern/arm/mem_layout-arm.cpp file on the Fiasco directory, which provides the default ARM addressing. Maybe that's where my error comes from ? How can I correctly configure my memory mapping, besides what I already configure in the Bsp (given in attachment) ? Also, it is the first time that I am assigned for porting a system, do you have some hints, like important steps to follow ? I am pretty sure it is a newbie error, but I cannot figure it out for now :( Thanks in advance for your time, -- Antoine Debut EPITA 2016 - GISTRE

3 7

Does the latest version of L4Re support 64bit VMM?
by nico 20 Nov '17

20 Nov '17

Hi, The latest kernel supports armv8 and 64bit Hyp mode. Does that mean we can run a guest OS in VM, such as 64bit Linux? Does L4Re provide the corresponding interfaces for that? Regards, Nico

2 1

Booting L4Re with qemu-system-arm: Panic in sigma0
by Leslie Zhai 01 Nov '17

01 Nov '17

Hi L4 hackers, $ svn info Path: . Working Copy Root Path: /data/project/l4re URL: https://svn.l4re.org/repos/oc/l4re/trunk Relative URL: ^/trunk Repository Root: https://svn.l4re.org/repos/oc/l4re Repository UUID: d050ee49-bd90-4346-b210-929a50b99cfc Revision: 75 Node Kind: directory Schedule: normal Last Changed Author: l4check Last Changed Rev: 75 Last Changed Date: 2017-10-15 19:49:39 +0800 (Sun, 15 Oct 2017) My Fiasco build config: # # Automatically generated file; DO NOT EDIT. # Fiasco configuration # CONFIG_HAS_FPU_OPTION=y CONFIG_HAS_SERIAL_OPTION=y CONFIG_HAS_JDB_GZIP_OPTION=y # # Target configuration # # CONFIG_IA32 is not set # CONFIG_AMD64 is not set CONFIG_ARM=y # CONFIG_MIPS is not set CONFIG_PF_INTEGRATOR=y # CONFIG_PF_REALVIEW is not set # CONFIG_PF_SUNXI is not set # CONFIG_PF_BCM283X is not set # CONFIG_PF_SA1100 is not set # CONFIG_PF_XSCALE is not set # CONFIG_PF_ARMADA38X is not set # CONFIG_PF_KIRKWOOD is not set # CONFIG_PF_TEGRA is not set # CONFIG_PF_LAYERSCAPE is not set # CONFIG_PF_IMX is not set # CONFIG_PF_RCAR3 is not set # CONFIG_PF_EXYNOS is not set # CONFIG_PF_S3C2410 is not set # CONFIG_PF_OMAP is not set # CONFIG_PF_ZYNQ is not set CONFIG_BSP_NAME="integrator" CONFIG_CAN_ARM_CPU_926=y CONFIG_CAN_ARM_CPU_1176=y CONFIG_ABI_VF=y CONFIG_ARM_926=y # CONFIG_ARM_1176 is not set CONFIG_FPU=y CONFIG_ARM_ALIGNMENT_CHECK=y CONFIG_ARM_EM_STD=y CONFIG_ARM_CPU_ERRATA=y # # Kernel options # # CONFIG_CONTEXT_8K is not set CONFIG_CONTEXT_4K=y CONFIG_FINE_GRAINED_CPUTIME=y CONFIG_SCHED_FIXED_PRIO=y # CONFIG_SCHED_WFQ is not set # CONFIG_SCHED_FP_WFQ is not set # # Debugging # CONFIG_INLINE=y # CONFIG_NDEBUG is not set # CONFIG_NO_FRAME_PTR is not set CONFIG_STACK_DEPTH=y CONFIG_LIST_ALLOC_SANITY=y CONFIG_SERIAL=y CONFIG_JDB=y CONFIG_JDB_LOGGING=y CONFIG_JDB_GZIP=y # CONFIG_JDB_ACCOUNTING is not set # CONFIG_WARN_NONE is not set # CONFIG_WARN_WARNING is not set CONFIG_WARN_ANY=y # # ARM debugging options # CONFIG_VMEM_ALLOC_TEST=y CONFIG_DEBUG_KERNEL_PAGE_FAULTS=y # # Compiling # CONFIG_CC="gcc" CONFIG_CXX="g++" CONFIG_HOST_CC="gcc" CONFIG_HOST_CXX="g++" CONFIG_MAINTAINER_MODE=y CONFIG_LABEL="" CONFIG_EXPERIMENTAL=y CONFIG_PERF_CNT=y CONFIG_BIT32=y CONFIG_WARN_LEVEL=2 CONFIG_XARCH="arm" CONFIG_ABI="vf" My L4Re build config: # Automatically generated. Don't edit BID_COMPILER_TYPE=gcc BUILD_SYSTEMS=arm_armv5te arm_armv5te-l4f CONFIG_ARCH_ENABLE_STACK_PROTECTOR=y CONFIG_BID_GCC_ENABLE_STACK_PROTECTOR=y CONFIG_BID_GCC_STACK_PROTECTOR=y CONFIG_BUILD_ABI="l4f" CONFIG_BUILD_ABI_l4f=y CONFIG_BUILD_ARCH="arm" CONFIG_BUILD_ARCH_arm=y CONFIG_CPU_ARM_ARMV5TE=y CONFIG_CPU="armv5te" CONFIG_CTAGS="ctags" CONFIG_DROPS_INSTDIR="/path/to/l4re" CONFIG_DROPS_STDDIR="/path/to/l4re" CONFIG_ETAGS="etags" CONFIG_LEX="flex" CONFIG_MAKECONFS_ADD="" CONFIG_YACC="yacc" GCCDIR=/usr/lib/gcc/arm-linux-gnueabi/6.1.1 GCCFORTRANAVAIL= GCC_HAS_ATOMICS= GCCINCFIXEDPATH=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/include-fixed GCCLIB_EH=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/libgcc_eh.a GCCLIB_FILE_crtbegin.o=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/crtbegin.o GCCLIB_FILE_crtbeginS.o=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/crtbeginS.o GCCLIB_FILE_crtbeginT.o=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/crtbeginT.o GCCLIB_FILE_crtend.o=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/crtend.o GCCLIB_FILE_crtendS.o=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/crtendS.o GCCLIB_HOST=/usr/lib/gcc/arm-linux-gnueabi/6.1.1/libgcc.a GCCLIB_S_SO= GCCMAJORVERSION=6 GCCMINORVERSION=1 GCCNOSTACKPROTOPT=-fno-stack-protector GCCPATCHLEVEL=1 GCCSTACKPROTALLOPT=-fstack-protector-all GCCSTACKPROTOPT=-fstack-protector GCCSYSLIBDIRS=-L/usr/lib/gcc/arm-linux-gnueabi/6.1.1/ -L/usr/lib/gcc/arm-linux-gnueabi/6.1.1/../../../../arm-linux-gnueabi/lib/arm-linux-gnueabi/6.1.1/ -L/usr/lib/gcc/arm-linux-gnueabi/6.1.1/../../../../arm-linux-gnueabi/lib/ -L/usr/arm-linux-gnu/sys-root/lib/arm-linux-gnueabi/6.1.1/ -L/usr/arm-linux-gnu/sys-root/lib/ -L/usr/arm-linux-gnu/sys-root/usr/lib/arm-linux-gnueabi/6.1.1/ -L/usr/arm-linux-gnu/sys-root/usr/lib/ GCCVERSION=6 HOST_SYSTEM=linux INT_CPP_NAME=cc1 INT_CXX_NAME=cc1plus INT_LD_NAME=arm-linux-gnu-ld LD_EMULATION=armelf_linux_eabi LD_GENDEP_PREFIX=LD_PRELOAD=libgendep.so LD_LIBRARY_PATH=/data/project/xiangzhai/l4re/l4/build-arm/tool/gendep/64:/data/project/xiangzhai/l4re/l4/build-arm/tool/gendep/32 LD_HAS_HASH_STYLE_OPTION=n LDVERSION=227-3 include /data/project/xiangzhai/l4re/l4/build-arm/.config.indep include /data/project/xiangzhai/l4re/l4/build-arm/.config.platform Booting L4Re with qemu-system-arm: $ make qemu CROSS_COMPILE=arm-linux-gnu- E=hello MODULE_SEARCH_PATH=/data/project/xiangzhai/l4re/kernel/fiasco/build-arm make[1]: Entering directory '/data/project/xiangzhai/l4re/l4' Image size(s) in bytes: bootstrap_hello.elf: 1279488 Start address: 0x1000000 --> Build-Nr: 6 QEMU-cmd: qemu-system-arm -kernel /data/project/xiangzhai/l4re/l4/build-arm/images/bootstrap.elf -serial stdio -M integratorcp -m 256 L4 Bootstrapper Build: #6 Tue Oct 31 15:50:55 CST 2017, 6.1.1 20160621 (Red Hat Cross 6.1.1-2) Scanning up to 256 MB RAM, starting at offset 32MB Memory size is 256MB (00000000 - 0fffffff) RAM: 0000000000000000 - 000000000fffffff: 262144kB Total RAM: 256MB Scanning fiasco Scanning sigma0 Scanning moe Moving up to 5 modules behind 1100000 moving module 02 { 10e7000-11284af } -> { 11d8000-12194af } [267440] moving module 01 { 10d5000-10e6343 } -> { 11c6000-11d7343 } [70468] moving module 00 { 1053000-10d4edb } -> { 1144000-11c5edb } [532188] moving module 04 { 1031000-1052697 } -> { 1122000-1143697 } [136856] moving module 03 { 100f000-1030473 } -> { 1100000-1121473 } [136308] Loading fiasco Loading sigma0 Loading moe find kernel info page... found kernel info page (via ELF) at 2000 Regions of list 'regions' [ 1000, 193f] { 940} Kern fiasco [ 2000, 8efff] { 8d000} Kern fiasco [ 8f000, 8f0eb] { ec} Root mbi_rt [ e0000, eb16b] { b16c} Sigma0 sigma0 [ f0000, f517b] { 517c} Sigma0 sigma0 [ 140000, 1711df] { 311e0} Root moe [ 180000, 18c4eb] { c4ec} Root moe [ 1000000, 100e4f7] { e4f8} Boot bootstrap [ 1100000, 1143fff] { 44000} Root Module found kernel options (via ELF) at 3000 Sigma0 config ip:000e0100 sp:00000000 Roottask config ip:00140254 sp:00000000 Starting kernel fiasco at 00001118 Hello from Startup::stage2 FPU: Initialize FPU0: Subarch: 1, Part: 10, Rev: 0, Var: 9, Impl: 41 KERNEL: Warning: Buddy::alloc: Size mismatch: 1c000 v 20000 SERIAL ESC: allocated IRQ 1 for serial uart Not using serial hack in slow timer handler. Welcome to L4/Fiasco.OC! L4/Fiasco.OC microkernel on arm Rev: 362fdae-dirty compiled with gcc 6.1.1 20160621 (Red Hat Cross 6.1.1-2) for Integrator [] Build: #2 Tue Oct 31 15:39:15 CST 2017 Calibrating timer loop... done. MDB: use page size: 20 MDB: use page size: 12 EXCEPTION: (00) Why undef insn? pfa=00002000, error=00000000 psr=20000110 R[0]: 00002000 00000000 00000000 000e01d0 000f0004 00002000 000f0030 00000000 R[8]: 00000000 00000000 00000000 000f281c 000f2808 00000000 00000000 000e01d4 KERNEL: Warning: Sigma0 raised an exception --> HALT Panic: ... --------------------------------------------------------------------- CPU 0 [f001519c]: abort jdb: Then how to use addr2line to find the root cause? please give me some hint, thanks a lot! $ arm-linux-gnu-addr2line -p -i -e bin/arm_armv5te/bootstrap.elf -a 00002000 Because 0001-Fix-invalid-initialization-in-new.patch has been already merged into svn trunk, so this http://os.inf.tu-dresden.de/pipermail/l4-hackers/2017/008111.html might not fix my issue, but as Sarah mentioned "looks like a compiler issue"? $ arm-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=arm-linux-gnu-gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/arm-linux-gnueabi/6.1.1/lto-wrapper Target: arm-linux-gnueabi Configured with: ../gcc-6.1.1-20160621/configure --bindir=/usr/bin --build=x86_64-redhat-linux-gnu --datadir=/usr/share --disable-decimal-float --disable-dependency-tracking --disable-gold --disable-libgcj --disable-libgomp --disable-libmpx --disable-libquadmath --disable-libssp --disable-libunwind-exceptions --disable-shared --disable-silent-rules --disable-sjlj-exceptions --disable-threads --with-ld=/usr/bin/arm-linux-gnu-ld --enable-__cxa_atexit --enable-checking=release --enable-gnu-unique-object --enable-initfini-array --enable-languages=c,c++ --enable-linker-build-id --enable-lto --enable-nls --enable-obsolete --enable-plugin --enable-targets=all --exec-prefix=/usr --host=x86_64-redhat-linux-gnu --includedir=/usr/include --infodir=/usr/share/info --libexecdir=/usr/libexec --localstatedir=/var --mandir=/usr/share/man --prefix=/usr --program-prefix=arm-linux-gnu- --sbindir=/usr/sbin --sharedstatedir=/var/lib --sysconfdir=/etc --target=arm-linux-gnueabi --with-bugurl=http://bugzilla.redhat.com/bugzilla/ --with-isl --with-newlib --with-plugin-ld=/usr/bin/arm-linux-gnu-ld --with-sysroot=/usr/arm-linux-gnu/sys-root --with-system-libunwind --with-system-zlib --without-headers --with-tune=cortex-a8 --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16 --with-abi=aapcs-linux --enable-gnu-indirect-function --with-linker-hash-style=gnu Thread model: single gcc version 6.1.1 20160621 (Red Hat Cross 6.1.1-2) (GCC) -- Regards, Leslie Zhai - https://reviews.llvm.org/p/xiangzhai/

3 4

Problem with L4Linux accessing ethernet clocks
by Manolis Ragkousis 01 Nov '17

01 Nov '17

Hello everyone, I am having trouble getting the network to work on L4Linux running on the zedboard. I have enabled the macb driver which my net card needs, I have created a device tree telling l4linux where to find the device and I have written the io configuration. The problem is that L4linux doesn't have access to the 3 clocks it needs for the network device to work. Those are "pclk", "hclk", "tx_clk". I understand that I have to assign those clocks to l4linux. But how can I do that? I cannot find any examples of assigning clocks. Won't this create an issue to the Fiasco kernel? Should the driver use "l4kipclk" instead of "pclk"? Below you will find the dmesg output, my io files, my cfg file and the device tree. Thank you for your time and help! Manolis ----dmesg output part begin---- __l4x_ioremap: Mapping physaddr e000b000 [0x1000 Bytes, e000b000+001000] to 00002000+000000 /amba/ethernet@e000b000: could not find phandle ERROR: could not get clock /amba/ethernet@e000b000:pclk(0) macb e000b000.ethernet: failed to get macb_clk (4294967294) macb: probe of e000b000.ethernet failed with error -2 ----dmesg output part end---- ---- zynq.dts begin ---- { model = "L4Linux (DT)"; compatible = "L4Linux"; #address-cells = <1>; #size-cells = <1>; chosen { }; aliases { }; amba { compatible = "simple-bus"; #address-cells = <0x1>; #size-cells = <0x1>; interrupt-parent = <0x3>; ranges; ethernet@e000b000 { compatible = "cdns,zynq-gem", "cdns,gem", "cdns,macb"; reg = <0xe000b000 0x1000>; status = "okay"; interrupts = <0x0 0x16 0x4>; clocks = <0x1 0x1e 0x1 0x1e 0x1 0xd>; clock-names = "pclk", "hclk", "tx_clk"; #address-cells = <0x1>; #size-cells = <0x0>; phy-mode = "rgmii-id"; phy-handle = <0x4>; ethernet-phy@0 { reg = <0x0>; linux,phandle = <0x4>; phandle = <0x4>; }; }; }; }; ---- zynq.dts end ---- ---- zedboard.devs begin ---- local Res = Io.Res local Hw = Io.Hw Io.hw_add_devices(function() NIC = Hw.Device(function() compatible = {"cdns,zynq-gem", "cdns,gem", "cdns,macb"}; Property.hid = "cdns,zynq-gem"; Property.flags = Io.Hw_device_DF_dma_supported; Resource.irq = Io.Res.irq(54); Resource.mem = Res.mmio(0xe000b000, 0xe000bfff); end); end); ---- zedboard.devs end ---- ---- hw_devices.io begin ---- local Hw = Io.system_bus() Io.add_vbus("l4linux", Io.Vi.System_bus { ethernet = wrap(Hw.NIC); }) ---- hw_devices.io end ---- ---- l4lx.cfg begin ---- local L4 = require("L4"); local loader = L4.default_loader; local lxname = "vmlinuz"; -- Start io vbus_l4linux = loader:new_channel(); local vbus_input = loader:new_channel(); loader:start( { caps = { sigma0 = L4.cast(L4.Proto.Factory, L4.Env.sigma0):create(L4.Proto.Sigma0); icu = L4.Env.icu; input = vbus_input:svr(); l4linux = vbus_l4linux:svr(); }, log = { "IO", "y" }, l4re_dbg = L4.Dbg.Warn, }, "rom/io rom/zedboard.devs rom/hw_devices.io"); L4.default_loader:start( { caps = { vbus = vbus_l4linux; }, l4re_dbg = L4.Dbg.Warn, log = L4.Env.log:m("rws"), }, "rom/vmlinuz mem=312M console=ttyLv0 " .. "l4x_dtb=rom/zynq-zed.dtb " .. "l4x_rd=rom/ramdisk-" .. L4.Info.arch() .. ".rd " .. "root=1:0 ramdisk_size=5000"); ---- l4lx.cfg end ----

3 13

Add network device to L4Linux
by Yiyang Su 27 Oct '17

27 Oct '17

Hi, Starting from a previous work [1], I have succeeded in booting L4Linux on Cubietruck with the snapshot (l4re-snapshot-2016082114). Then I have been trying to configure L4Linux to access Ethernet device. With current configuration I cannot boot L4Llinux anymore. Following is my configuration and boot log: l4lx-net-cubi.devs =========================================== local Res = Io.Res local Hw = Io.Hw Io.hw_add_devices(function() NIC = Hw.Device(function() Property.hid = "sun7ia20gmac"; compatible = {"allwinner,sun7i-a20-gmac"}; Resource.regs = Res.mmio(0x01c50000, 0x01c5ffff); --Resource.irq = Res.irq(0); Resource.irq = Res.irq(85); --Resource.irq = Res.irq(4); Property.flags = Io.Hw_device_DF_dma_supported; end); end) l4lx-net-cubi.io =========================================== local hw = Io.system_bus() Io.add_vbus("l4linux", Io.Vi.System_bus { NIC = wrap(hw:match("allwinner,sun7i-a20-gmac")); }) l4lx-net-cubi.cfg =========================================== local L4 = require("L4"); local loader = L4.default_loader; vbus_l4linux = loader:new_channel(); loader:start( { caps = { icu = L4.Env.icu, sigma0 = L4.cast(L4.Proto.Factory, L4.Env.sigma0):create(L4.Proto.Sigma0), l4linux = vbus_l4linux:svr(), }, log = {"IO", "y"}, l4re_dbg = L4.Dbg.Warn, }, "rom/io -vvv rom/l4lx-net-cubi.devs rom/l4lx-net-cubi.io" ); -- start L4Linux loader:start( { caps = { vbus = vbus_l4linux, }, --log = {"l4linux", "cyan"}, log = L4.Env.log:m("rws"), l4re_dbg = L4.Dbg.Warn, }, "rom/vmlinuz mem=64M console=ttyLv0 earlyprintk=1 l4x_dtb=rom/sun7i-a20-cubietruck.dtb " .. "l4x_rd=rom/ramdisk-" .. L4.Info.arch() .. ".rd " .. "root=1:0 rw ramdisk_size=4000" ); modules.list ============================================ entry L4Linux-net-cubi roottask moe rom/l4lx-net-cubi.cfg module l4re module ned module io module sun7i-a20-cubietruck.dtb module l4lx-net-cubi.cfg module l4lx-net-cubi.devs module l4lx-net-cubi.io module vmlinuz module[perl] "ramdisk-$ENV{ARCH}.rd" boot log =================================== U-Boot SPL 2017.03-rc3 (Aug 14 2017 - 13:26:17) DRAM: 2048 MiB CPU: 912000000Hz, AXI/AHB/APB: 3/2/2 Trying to boot from MMC1 U-Boot 2017.03-rc3 (Aug 14 2017 - 13:26:17 +0200) Allwinner Technology CPU: Allwinner A20 (SUN7I) Model: Cubietech Cubietruck I2C: ready DRAM: 2 GiB MMC: SUNXI SD/MMC: 0 *** Warning - bad CRC, using default environment Setting up a 1024x768 vga console (overscan 0x0) In: serial Out: vga Err: vga SCSI: SATA link 0 timeout. AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA mode flags: ncq stag pm led clo only pmp pio slum part ccc apst Net: eth0: ethernet@01c50000 starting USB... USB0: USB EHCI 1.00 USB1: USB OHCI 1.0 USB2: USB EHCI 1.00 USB3: USB OHCI 1.0 scanning bus 0 for devices... 1 USB Device(s) found scanning bus 2 for devices... 1 USB Device(s) found scanning usb for storage devices... 0 Storage Device(s) found Hit any key to stop autoboot: 0 switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1... Found U-Boot script /boot/boot.scr reading /boot/boot.scr 1165 bytes read in 24 ms (46.9 KiB/s) ## Executing script at 43100000 Failed to mount ext2 filesystem... ** Unrecognized filesystem type ** reading boot/uImage 10481728 bytes read in 652 ms (15.3 MiB/s) ## Booting kernel from Legacy Image at 48000000 ... Image Name: L4 Image #32 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 10481664 Bytes = 10 MiB Load Address: 41000000 Entry Point: 41000000 Verifying Checksum ... OK Loading Kernel Image ... OK Starting kernel ... L4 Bootstrapper Build: #32 Mi 13. Sep 11:47:18 CEST 2017, 4.9.4 Scanning up to 1024 MB RAM, starting at offset 32MB Memory size is 1024MB (40000000 - 7fffffff) RAM: 0000000040000000 - 000000007fffffff: 1048576kB Total RAM: 1024MB Scanning fiasco Scanning sigma0 Scanning moe Moving up to 12 modules behind 41100000 moving module 02 { 419cd000-419fe49b } -> { 41abd000-41aee49b } [201884] moving module 01 { 419bb000-419cc337 } -> { 41aab000-41abc337 } [70456] moving module 00 { 4192d000-419ba98b } -> { 41a1d000-41aaa98b } [579980] moving module 11 { 4162d000-4192cfff } -> { 4171d000-41a1cfff } [3145728] moving module 10 { 4122b000-4162c473 } -> { 4131b000-4171c473 } [4199540] moving module 09 { 4122a000-4122a0c2 } -> { 4131a000-4131a0c2 } [195] moving module 08 { 41229000-412291ef } -> { 41319000-413191ef } [496] moving module 07 { 41228000-4122835d } -> { 41318000-4131835d } [862] moving module 06 { 4121f000-41227d73 } -> { 4130f000-41317d73 } [36212] moving module 05 { 41094000-4121e8d3 } -> { 41184000-4130e8d3 } [1616084] moving module 04 { 41032000-410936a7 } -> { 41122000-411836a7 } [399016] moving module 03 { 41010000-4103145f } -> { 41100000-4112145f } [136288] Loading fiasco Loading sigma0 Loading moe find kernel info page... found kernel info page (via ELF) at 40002000 Regions of list 'regions' [ 40000000, 400001cf] { 1d0} Root mbi_rt [ 40001000, 40001a7f] { a80} Kern fiasco [ 40002000, 4009afff] { 99000} Kern fiasco [ 400c0000, 400ca287] { a288} Sigma0 sigma0 [ 400d0000, 400d6177] { 6178} Sigma0 sigma0 [ 40140000, 40168fcb] { 28fcc} Root moe [ 40170000, 40176ff3] { 6ff4} Root moe [ 41000000, 4100f5cb] { f5cc} Boot bootstrap [ 41100000, 41a1cfff] { 91d000} Root Module found kernel options (via ELF) at 40003000 API Version: (87) experimental Sigma0 config ip:400c0100 sp:00000000 Roottask config ip:40140210 sp:00000000 Starting kernel fiasco at 4000124c Non-HYP kernel detected but running in HYP mode, switching back. Hello from Startup::stage2 Number of IRQs available at this GIC: 160 FPU: Initialize FPU0: Subarch: 2, Part: 30, Rev: 4, Var: 7, Impl: 41 ARM generic timer: freq=24000000 interval=24000 cnt=212673046 SERIAL ESC: allocated IRQ 33 for serial uart Not using serial hack in slow timer handler. Welcome to L4/Fiasco.OC! L4/Fiasco.OC microkernel on arm Rev: unknown compiled with gcc 4.9.4 for Allwinner A20 [] Build: #4 Mon Sep 11 10:25:38 CEST 2017 Calibrating timer loop... done. MDB: use page size: 20 MDB: use page size: 12 SIGMA0: Hello! KIP @ 40002000 allocated 4KB for maintenance structures SIGMA0: Dump of all resource maps RAM:------------------------ [4:40000000;40000fff] [0:4009b000;400bffff] [0:400cb000;400cffff] [0:400d7000;4013ffff] [4:40140000;40168fff] [0:40169000;4016ffff] [4:40170000;40176fff] [0:40177000;410fffff] [4:41100000;41a1cfff] [0:41a1d000;7effffff] IOMEM:---------------------- [0:0;3fffffff] [0:80000000;ffffffff] MOE: Hello world MOE: found 1021976 KByte free memory MOE: found RAM from 40000000 to 7f000000 MOE: allocated 1008 KByte for the page array @0x40177000 MOE: virtual user address space [0-bfffffff] MOE: rom name space cap -> [C:103000] BOOTFS: [41100000-41121460] [C:105000] l4re BOOTFS: [41122000-411836a8] [C:107000] ned BOOTFS: [41184000-4130e8d4] [C:109000] io BOOTFS: [4130f000-41317d74] [C:10b000] sun7i-a20-cubietruck.dtb BOOTFS: [41318000-4131835e] [C:10d000] l4lx-net-cubi.cfg BOOTFS: [41319000-413191f0] [C:10f000] l4lx-net-cubi.devs BOOTFS: [4131a000-4131a0c3] [C:111000] l4lx-net-cubi.io BOOTFS: [4131b000-4171c474] [C:113000] vmlinuz BOOTFS: [4171d000-41a1d000] [C:115000] ramdisk-arm.rd MOE: cmdline: moe rom/l4lx-net-cubi.cfg MOE: Starting: rom/ned rom/l4lx-net-cubi.cfg MOE: loading 'rom/ned' Ned says: Hi World! Ned: loading file: 'rom/l4lx-net-cubi.cfg' IO | Io service IO | Verboseness level: 4 IO | unused physical memory space: IO | [00000000000000-0000003fffffff] IO | [00000080000000-000000ffffffff] IO | no 'iommu' capability found use CPU-phys for DMA IO | Loading: config 'rom/l4lx-net-cubi.devs' IO | warning: inconsistent fixed resource @ device: /System Bus/ IO | : hid=sun7ia20gmac IO | DMADOM [00000000000000-00000000000000 1] non-pref (32bit) (align=0 flags=6) IO | Loading: config 'rom/l4lx-net-cubi.io' IO | Real Hardware ----------------------------------- IO | System Bus: hid= IO | Resources: ==== start ==== IO | DMADOM [00000000000000-00000000000000 1] non-pref (32bit) (align=0 flags=6) IO | Resources: ===== end ===== IO | NIC: hid=sun7ia20gmac IO | Clients: ===== start ==== IO | NIC: [N2Vi9Proxy_devE] IO | Clients: ===== end ==== IO | Resources: ==== start ==== IO | IRQ [00000000000055-00000000000055 1] none (32bit) (align=0 flags=1) IO | IOMEM [00000001c50000-00000001c5ffff 10000] non-pref (32bit) (align=ffff flags=2) IO | DMADOM [00000000000000-00000000000000 1] non-pref (32bit) (align=0 flags=6) IO | Resources: ===== end ===== IO | warning: could not register control interface at cap 'platform_ctl' IO | Ready. Waiting for request. PH 0 offs=00010000 flags=rwx PH-type=0x1 virt=02000000 evirt=0245b5dc phys=02000000 ephys=0245b5dc f_sz=003d3653 memsz=0045b5dc PH 1 offs=00394898 flags=r-x PH-type=0x4 virt=02384898 evirt=023848bc phys=02384898 ephys=023848bc f_sz=00000024 memsz=00000024 PH 2 offs=00000000 flags=rwx PH-type=0x6474e551 virt=00000000 evirt=00000000 phys=00000000 ephys=00000000 f_sz=00000000 memsz=00000000 Starting binary at 0x2000330, argc=9 argv=0xafff4f84 *argv=0xb1007ff4 argv0=rom/vmlinuz External resolver is at 0xa80007cc ======> L4Linux starting... <======== Linux version 4.7.0-l4 (yiyang@i85217) (gcc version 4.9.4 (Linaro GCC 4.9-2017.01) ) #4 Wed Sep 13 11:18:30 CEST 2017 Binary name: rom/vmlinuz This is an AEABI build. Linux kernel command line (8 args): mem=64M console=ttyLv0 earlyprintk=1 l4x_dtb=rom/sun7i-a20-cubietruck.dtb l4x_rd=rom/ramdisk-arm.rd root=1:0 rw ramdisk_size=4000 CPU mapping (l:p)[1]: 0:0 Image: 02000000 - 02600000 [6144 KiB]. Areas: Text: 02000000 - 023848bc [3602kB] RO-Data: 022ad000 - 02370000 [780kB] Data: 023ac000 - 023cefe0 [139kB] Init: 02385000 - 023ac000 [156kB] BSS: 023d3653 - 0245b5dc [543kB] Device scan: Device: L4ICU Device: NIC IRQ: 00000055 - 00000055 MEM: 01c50000 - 01c5ffff DMAD: 00000000 - 00000000 Device scan done. l4lx_thread_create: Created thread 41e (cpu0) (u:b3000e00, v:b3000c00, sp:023adfa4) main thread will be 41e L4x: section-with-init(-data): Virt: 0x2000000 to 0x245bfff [4464 KiB] section-with-init(-data): Phys: 0x40273000 to 0x406cefff, [4464 KiB] L4x: section-with-init-text: Virt: 0x2000000 to 0x245bfff [4464 KiB] error: failed to get physical address for 2000000. L4x: Main thread running, waiting... L4x: Memory size: 64MB L4x: Setting superpages for main memory L4x: Adjusted memory start: 02000000 L4x: Main memory: Virt: 0x2600000 to 0x65fffff [65536 KiB] Main memory: Phys: 0x41c00000 to 0x45bfffff, [65536 KiB] l4x: vmalloc area: 06600000 - 0e600000 L4x: text: Virt: 0x2000000 to 0x245bfff [4464 KiB] error: failed to get physical address for 2000000. The boot process stops at this point. Compare with other boot logs in archives the following step could be the loading ramdisk and device tree blob. Then I delete the "l4x_dtb=rom/sun7i-a20-cubietruck.dtb" from the cmdline, it can boot the L4Linux again. Does it mean there is a problem with loading the device tree blob? Any suggestion is very appreciated. Thanks. Best regards, Yang [1] http://os.inf.tu-dresden.de/pipermail/l4-hackers/2017/008120.html

5 7

FOSDEM 2018 - Microkernels developer room - CfP
by Jakub Jermar 09 Oct '17

09 Oct '17

FOSDEM 2018 - Microkernels developer room CALL FOR PARTICIPATION The developers of several free and open-source microkernel-based operating systems will meet at FOSDEM 2018 [1] in Brussels, Belgium and will share a developer room on Saturday of February 3, 2018 [2]. The devroom is currently looking for content in the form of talks and activities related to the area of microkernel-based operating systems. Possible topics include, but are not limited to: * Introduction of a specific OS or framework * Design of subsystems and the general architecture of an OS * Enabling support for hardware (architectures, device drivers) * Used languages and tools * Maintenance and testing * Security and robustness * Trends and challenges * Use cases, experiences, lessons learned and demos Please use the Pentabarf [3] system to submit your proposals and file it under the track “Microkernels devroom”. You do not need to create a new account if you already have one. When in doubt, please use the devroom mailing list [4]. If you do not want to give a talk yourself, you may still send suggestions for what else you would like to see, or do in the devroom. Please send your suggestions to the mailing list. The deadline for your proposal is on December 8. Make sure to include the following in your proposal: * Title of your talk (will be printed in the FOSDEM booklet) * Your full name (will be printed in the FOSDEM booklet) * A short abstract (one or two paragraphs) * Duration of your talk (please, at least 25 and no longer than 45 min) The official devroom schedule (along with the accepted talks) will be announced on December the 15th on the devroom's mailing list and the speakers will be notified via e-mail. The schedule will also be published on the FOSDEM website. About FOSDEM FOSDEM is a two-day event organised by volunteers to promote the widespread use of free and open source software. Taking place in the beautiful city of Brussels (Belgium), FOSDEM is widely recognised as the best such conference in Europe. FOSDEM covers a wide spectrum of free and open source software projects, and offers a platform for people to collaborate. To this end, FOSDEM has set up developer rooms (devrooms) with network/internet connectivity and projectors where teams can meet and showcase their projects. Devrooms are a place for teams to discuss, hack and publicly present latest directions, lightning talks, news and discussions. Besides developer rooms, FOSDEM also offers main tracks, lightning talks, certification exams and project stands. Every year, FOSDEM hosts more than 5000 developers at the ULB Solbosch campus. Participation and attendance is totally free, though the organisers gratefully accept donations and sponsorship. No registration necessary. About the devroom Since the first Microkernel devroom in 2012 this devroom has been part of each following FOSDEM. By now it has become a somewhat institutionalized tradition for the microkernel community to meet there; to this date over a dozen projects have participated in one way or another. Each of the projects face similar challenges but come up with partially different solutions. Therefore, the goal of the Microkernel devroom is to bring the various projects together, let them exchange ideas, cross-pollinate and socialize. Social events It also has become a habit that the microkernel projects dine together somewhere in downtown Brussels after the devroom closes. The year 2018 will not be any different, so there is going to be a microkernel family dinner on Saturday night. The exact location and time will be specified later. Consult the FOSDEM web and other projects for additional social events such as the famous FOSDEM-organized Friday Beer Event and the FOSDEM-arranged free sightseeing tours for spouses. Important dates recap * 08.12.2017: Deadline for submissions * 15.12.2017: Schedule published and speakers notified of acceptance * 03.02.2018: The devroom takes places Links [1] http://fosdem.org/ [2] https://fosdem.org/2018/practical/transportation/ [3] https://penta.fosdem.org/submission/FOSDEM18 [4] https://lists.fosdem.org/listinfo/microkernel-devroom See you all at FOSDEM!

1 0