l4-hackers November 2017

l4-hackers@os.inf.tu-dresden.de

7 participants
5 discussions

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

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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/

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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 ----

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l4-hackers November 2017