l4-hackers June 2013

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

14 participants
19 discussions

Error during the "ned" package build (svn revision 42)
by ggasnier31＠free.fr 16 Jul '13

16 Jul '13

Hello, I got the following error building the "ned" package for ARM architecture (Cortex-A9, Pandaboard). I use the last Linaro toolchain "gcc-linaro-arm-linux-gnueabihf-4.7-2012.12-20121214_linux". === Building package "ned" === make[1]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned' make[2]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server' make[3]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' ... … [View More]Building /home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/.general.d make[3]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[3]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[4]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' ... Building .general.d ... Building Makefile.inc make[4]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[4]: Entering directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[4]: *** No rule to make target `ned.lua.bin.o', needed by `ned'. Stop. make[4]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[3]: *** [/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f] Error 2 make[3]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[2]: *** [src] Error 2 make[2]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server' make[1]: *** [server] Error 2 make[1]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned' make: *** [ned] Error 2 Commenting the line "OBJS += ned.lua.bin.o" in the file l4/pkg/ned/server/src/Makefile gives this error. ==> Linking ned lua.o: In function `lua(int, char const* const*)': /home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src/lua.cc:97: undefined reference to `_binary_ned_lua_start' /home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src/lua.cc:97: undefined reference to `_binary_ned_lua_end' make[4]: *** [ned] Error 1 make[4]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f' make[3]: *** [/home/repository/L4.kernel/fiasco/src/l4/ArmBuild/pkg/ned/server/src/OBJ-arm_armv7a-l4f] Error 2 make[3]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server/src' make[2]: *** [src] Error 2 make[2]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned/server' make[1]: *** [server] Error 2 make[1]: Leaving directory `/home/repository/L4.kernel/fiasco/src/l4/pkg/ned' make: *** [ned] Error 2 Regards, Guillaume GASNIER [View Less]

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Thought you'd find this interesting
by Rahul Singhal 30 Jun '13

30 Jun '13

Hi! I’ve just learned about the water crisis and thought you would be interested to check out this story: https://waterforward.charitywater.org/et/xclFZthf Let me know what you think! Thanks, Rahul -- Sent via WaterForward, an initiative of charity: water WaterForward, 387 Tehama Street, San Francisco, CA 94103, USA. Click here to unsubscribe: https://waterforward.charitywater.org/opt_out?et=xclFZthf

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15th Real Time Linux Workshop - Call for Papers
by Nicholas Mc Guire 25 Jun '13

25 Jun '13

15th Real Time Linux Workshop 1st Call for Papers October 28 - 31, 2013 Dipartimento tecnologie innovative Scuola universitaria professionale della Svizzera italiana Lugano-Manno Switzerland Following the meetings of academics, developers and users of real-time and embedded Linux at the previous 14 Real Time Linux Workshops held world-wide (Vienna, … [View More]Orlando, Milano, Boston, Valencia, Singapore, Lille, Lanzhou, Linz, Guadalajara, Dresden, Nairobi, Prague and Chapel Hill) - the 2013 Real Time Linux Workshop will come to the Scuola Universitaria Professionale della Svizzera Italiana in Lugano-Manno, Switzerland. It will be held from October 28 to October 31, 2013. Rationale Real-time systems have evolved over the past decades in a relatively calm manner - performance has increased, one can say dramatically, but the main paradigms were pretty stable since the mid 80s. With the considerable increase of computing power, notably with multicore systems becoming mainstream in embedded devices, the requirements on RTOS are shifting and the tools are again trying to catch up. In stark contrast to 1999 (when the first RTLWS took place), Linux has a strong position in all kind of embedded systems, ranging from consumer electronics to network devices and a broad range of industrial applications including safety related systems. The technological resources suitable for high-availability, real-time, and safety critical systems have been continuously expanding and improving - allowing to cover the entire development life cycle of industrial projects based on open-source tools. At the core of this development is the availability of stable operating systems with reliable real-time properties. Extending and improving the real-time properties of Open Source RTOS is a continuous research and development effort. The OSADL has set itself the ambitious goal to document these efforts and it's most effective tool to do so is the annual Real Time Linux Workshop. Call for papers Authors from regulatory bodies, academics, industry as well as the user-community are invited to submit original work dealing with general topics related to Open Source and Free Software based real-time systems research, experiments and case studies, as well as issues of integration of open-source real-time and embedded OS. A special focus will be on industrial case studies and safety related systems. Topics of interest include, but are not limited to: - Modifications and variants of the GNU/Linux operating system and extending its real-time capabilities, - Contributions to real-time Linux variants, drivers and extensions, - Tools for the verification and validation of real-time properties, - User-mode real-time concepts, implementation and experience, - Real-time Linux applications, in academia, research and industry, - Safety related FLOSS systems, - Safety related systems using FLOSS components, - FLOSS Tools used to analyze, verify or validate safety properties, - Work in progress reports, covering recent developments, - Educational material on real-time Linux, - RTOS core concepts, RT-safe synchronization mechanisms, - RT-safe IPC mechanisms for RT and non RT components, - Analysis and benchmarking methods and results of real-time GNU/Linux variants, - Debugging techniques and tools, both for code and temporal debugging of core RTOS components, drivers and real-time applications, - Real-time related extensions to development environments Abstract submission If you wish to present a paper at the workshop, please submit an abstract using the submission page at https://www.osadl.org/RTLWS15-Abstract.submission-form.0.html. Final paper to be included into the RTLWS15 Proceedings Upon acceptance of an abstract by the RTLWS15 Program Committee, the author will be invited to submit a full paper in a form defined by https://www.osadl.org/paper.tgz. A detailed description of the editing and formatting process will be provided along with the notification email. Further information: http://www.osadl.org/RTLWS Important dates July 29, 2013 - Abstract submission deadline August 26, 2013 - Notification of acceptance September 23, 2013 - Submission of final paper October 28-31, 2013 - Workshop Organization committee: Local organizers: - Roberto Bucher, Scuola universitaria professionale della Svizzera italiana SUPSI, Switzerland OSADL/RTLF - Carsten Emde, OSADL - Nicholas Mc Guire, OSADL - Andreas Platschek, ICT, Vienna University of Technology, Austria Program committee: - Alexey Khoroshilov, ISPRAS, Russia - Andrea Bastoni, SYSGO AG, Germany - Andreas Platschek, TU-Wien, Austria - Bernhard N�lte, IQSE TueV SueD Rail, Germany - Carsten Emde, OSADL, Germany - Cheng Sheng, Beijing Shenzhou Aerospace Software Technology, China - Fans, Spectrum Sys, China - Georg Schiesser, OpenTech EDV Research, Austria - Herman H�rtig, Technische Universit�t Dresden, Germany - Julia Lawall, Inria/LIP6, France - Julien Delange, Carnegie Mellon Software Engineering Institute, USA - Klaus Reichl, Base Systems Technology Thales, Austria - Matthias Auchmann, A&R TECH, Austria - Michal Sojka, Czech Technical University in Prague, Czech Republic - Nicholas Mc Guire, OpenTech EDV Research, Austria - Paul E. McKenney, IBM Linux Technology Center, USA - Paolo Mantegazza, Politecnico di Milano, Italy - Peter Okech, University of Nairobi, Kenya - Peter Wurmsdobler, Aveillant Ltd, UK - Peter Zijlstra, RedHat, Netherlands - Philippe Gerum, Xenomai, France - Roberto Bucher, SUPSI, Switzerland - Shawn Choo, Weslab, Singapur - Stefan Schoenegger, B&R, Austria - Steven Rostedt, RedHat, USA - Thomas Gleixner, Linutronix, Germany - Yutaka Matsuno, University of Electro-Communications, Japan - Zhou Qingguo, DSLab, Lanzhou University, China Workshop organizers: - Dipartimento Tecnologie Innovative, SUPSI, Switzerland - Open Source Automation Development Lab (OSADL) Roberto Bucher Carsten Emde Nicholas Mc Guire Andreas Platschek [View Less]

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How to run simple client server example
by Thang Tran 24 Jun '13

24 Jun '13

Hi, I'm new to Fiasco and L4Re. I want to write a new program in C++ which will run on L4Re. I'm looking at the simple client server example in the l4/pkg/examples/clntsrv directory for my reference. I was able to get it compiled eventually on L4Re, but I have no idea how to run it. Is there anyway that I can run examples/clntsrv package just like we run the hello package by using grub2iso and qemu? Thanks in advance, Thang Tran.

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Unable to boot 64bit hello
by Daniel Müller 14 Jun '13

14 Jun '13

Hi, I tried booting a 64bit hello world program on L4/Fiasco but that fails with a region overlap: ============================================= xc: info: VIRTUAL MEMORY ARRANGEMENT: Loader: 0000000000100000->000000000019dd88 TOTAL: 0000000000000000->000000007f800000 ENTRY ADDRESS: 0000000000100000 xc: info: PHYSICAL MEMORY ALLOCATION: 4KB PAGES: 0x0000000000000200 2MB PAGES: 0x00000000000003fb 1GB PAGES: 0x0000000000000000 Daemon running with PID 9320 … [View More]net0: 00:16:3e:72:79:e5 using rtl8139 on PCI00:04.0 (open) [Link:up, TX:0 TXE:0 RX:0 RXE:0] DHCP (net0 00:16:3e:72:79:e5)... ok net0: 192.168.178.200/255.255.255.0 gw 192.168.178.54 Booting from PXE menu boot PXEBS (net0 type 128).... ok Next server: 192.168.178.54 Filename: pxeboot.0 tftp://192.168.178.54/pxeboot.0... ok L4 Bootstrapper Build: #7 Sun Jun 9 16:51:46 CEST 2013, x86-64, 4.6.3 RAM: 0000000000000000 - 000000000009a7ff: 618kB RAM: 0000000000100000 - 000000007f7b9fff: 2087656kB Total RAM: 2039MB New region for list regions: [ 20d000, 4c62c9] { 2b92ca} Root Module overlaps with: [ 2d0080, 2e45c7] { 14548} Boot bootstrap Regions of list 'regions' [ 0, fff] { 1000} Arch BIOS [ e0000, fffff] { 20000} Arch BIOS [ 106000, 1a646f] { a0470} Root Module [ 1a7000, 20c9bd] { 659be} Root Module [ 2d0080, 2e45c7] { 14548} Boot bootstrap [ 1013000, 10a8fff] { 96000} Boot bootstrap-ptab64 [ fc000000, ffffffff] { 4000000} Arch BIOS region overlap Key press reboots... ============================================= Everything works for 32bit. I took a look at bootstrap/server/src/startup.cc. I verified that modaddr is correctly passed to boostrap in both cases (32 and 64bit; it is 0x2000000 everytime). It appears that the failure happens in the call to add_boot_modules_region(): /* we're just a GRUB-booted kernel! */ add_boot_modules_region(mbi); if (_mod_addr) move_modules(mbi, _mod_addr); I do not fully understand all this code but to me this looks like a logic error: first the move should happen to honor "-modaddr" and only then the overlap check should be done. Here is the output for 32bit: ============================================= L4 Bootstrapper Build: #3 Sun Jun 9 16:55:38 CEST 2013, x86-32, 4.6.3 RAM: 0000000000000000 - 000000000009a7ff: 618kB RAM: 0000000000100000 - 000000007f7b9fff: 2087656kB Total RAM: 2039MB Moving up to 7 modules behind 2000000 moving module 00 { 139000-1ba783 } -> { 2829000-28aa783 } [530308] moving module 01 { 1bb000-21015e } -> { 28ab000-290015e } [348511] moving module 02 { 2e5000-51f51c } -> { 2901000-2b3b51c } [2336029] moving module 03 { 520000-762e3b } -> { 2000000-2242e3b } [2371132] moving module 04 { 763000-8880c6 } -> { 2243000-23680c6 } [1200327] moving module 05 { 211000-211080 } -> { 2369000-2369080 } [129] moving module 06 { 889000-9616a6 } -> { 236a000-24426a6 } [886439] Scanning /fiasco -serial -serial_esc -comspeed 115200 -comport 1 -nokdb Scanning /sigma0 Scanning /moe rom/hello.lua Bootloader MMAP: [ 0, 9a800) RAM (1) [ e0000, 100000) reserved (2) [ 100000, 7f7ba000) RAM (1) [ fc000000, 100000000) reserved (2) Relocated mbi to [0x2e0000-0x2e043f] Loading /fiasco Loading /sigma0 Loading /moe find kernel info page... found kernel info page at 0x400000 ... ============================================= Since the module addresses are also different between the two version this might also be an issue with the linker scripts (and thus just luck that the 32bit version boots), I would guess. I am using a Xen VM for testing. Any help would be appreciated. Thanks, Daniel [View Less]

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How to make task run on different cores?
by Chao-Jui Chang 12 Jun '13

12 Jun '13

Hi, I start up 4 L4Linux on intel core2quad platform. In jdb, I can see 4 vmlinuz on the task list (command 's' in jdb). Next, I run 4 benchmarks, one in each L4Linux, but the experiment result shows that the 4 benchmark are running on the same core. The kernel seems not scheduling them to different cpu cores. I have enabled "Enable multi processor support" option in fiasco config menu and the jdb shows there are 4 cores: *** Cut start *** -------------------------------------------------… [View More]

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How Fiasco reclaim task resources when the task exits (abnormally) ?
by BogDan 11 Jun '13

11 Jun '13

Hello, What happens with a task resources when a task crashes or it leaks resources at exit? How this resources (e.g. memory, file descriptors, any other capabilities) are reclaimed back by the o.s. ? Cheers, BogDan.

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Re: Fiasco.OC with ARM TrustZone
by Chao-Jui Chang 11 Jun '13

11 Jun '13

Hi Adam, Thanks for your reply. After I change the memory to 1023, it runs but stops at ### Timer for CPU0 is at IRQ 28 Calibrating timer loop... ### By the way, how to turn on the module loading information during booting? The latest snapshot and svn only prints message starting from "Hello from Startup::stage2" ### Start cur ### Exynos4412 # run fiasco Partition1: Start Address(0x1000), Size(0x32000) reading bootstrap.raw 803080 bytes read Boot with zImage Starting kernel ... Hello from … [View More]

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Program development for L4Re
by Rahul Singhal 11 Jun '13

11 Jun '13

I have recently ported l4 fiasco + l4Re on raspberry pi. I tested the port with the sample hello world program and it works fine.Now I want to write some of my own programs (C++, C and python) and run it on this environment. All I have done as of now is modify the sample hello world code a bit and test it. How do I go about doing this and where to start from? i appreciate your help. Regards Rahul

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Task threads are not killed at exit
by BogDan 10 Jun '13

10 Jun '13

Hello, Not all the task threads are killed when a task exits or it crashes. I've created a simple example here: http://paste.kde.org/760274 After application crashes (line 22), test thread is still alive, I still can see "Test thread alive" message printed. If I call exit or return instead to crash the task, the test thread is still alive . Cheers, BogDan.

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l4-hackers June 2013