Devel September 2014

devel@sel4.systems

10 participants
6 discussions

x86 Bootable USB install
by Matthew Scaperoth 14 Oct '14

14 Oct '14

Hello, I am at the George Washington University working on benchmarking the seL4 system. I am new to systems, and I am having a hard time building a bootable USB image On Ubuntu 14.04 x86. I understand that there is a Grub2 stanza on the Downloads page <https://sel4.systems/Download/> on the SeL4 website, but I cannot find the sel4kernel and sel4rootserver files in the system to build into a boot image. I would like to build an image using a process similar to the one in Pistachio (see https://www.l4ka.org/120.php) except for using Grub2 of course. Are there instructions for booting on full hardware such as a PC? Regards, Matthew Scaperoth Jr. Programmer Analyst The George Washington University Academic Technologies Tel: 202-994-6907

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several questions about seL4
by 조현우 25 Sep '14

25 Sep '14

Hi I am new in seL4. It is really interesting OS. I would like to ask some questions even though the FAQ explains many things. 1. How different is seL4+VMM with OKL4 or codezero? If there is some performance gap between them, I am curious where the overheads are for? 2. I am wondering how well seL4 can support virtualization services. Can seL4 supports more than two linux simultaneously on the VMM layers? Moreover, can it execute different kind of guest OSes at the same time? What about RTOS? A RTOS can be executed with keeping their real time property on the seL4+VMM?? Lastly, I would like to know when new version of the VMM for A15 support will be released. 3. Did you use a code generator when you hit the steps for “Specification”, “Haskell Prototype” and “C code” In the Proof Processing? If you did it using any automatic tool, I am so curious how you verified and validated the codes. 4., According to the FAQ, current multicore support is through a multikernel configuration. Do you have any plan for one seL4 kernel to manage several processors? Thank you much in advance. Regards, Joe.

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Building a Custom Test
by Matthew Scaperoth 23 Sep '14

23 Sep '14

Hello All, First I wanted to say thank you for this dev forum. The more I learn about SeL4 the more I am amazed with how well it is written. I am working on a 32-bit Ubuntu 14.04 and I would like to run your individual test suites in the sel4-manifest with a 32-bit build. Specifically some of the tests from the https://github.com/seL4/sel4test/tree/master/apps/sel4test-tests/src directory. For example, I'd like to alter the code a little bit and run qemu to output cycle time for IPC or memory mapping. So potentially I would boot up the image, the files would load and I would get an output saying "Intra-as IPC 151 cycles" or something along those lines after the test was automatically run. I was reading through the files and noticed that the main.c accepts arguments to say which test I'd like to run using the find_test() method with the argv passed in. I am now trying to find a way to use the main.c file in sel4test-tests to achieve the build I am after. I also noticed that a .bin file and a another file in stage/ia32/pc99/bin/sel4test-tests are generated when you run the first top-level make after the configuration. So I have tried booting the sel4test-tests file in qemu with qemu-system-i386 -m 512 -serial stdio -kernel images/kernel-ia32-pc99 -initrd stage/ia32/pc99/bin/sel4test-tests but nothing happens. My thought process was that it could replace the driver image for ia32 pc99 (sel4test-driver-image-ia32-pc99) . So I am missing a piece here (or pieces?). I am not sure if there is a Makefile that I can alter to include only a specific test, or if it's something else entirely. I'd be happy to clarify what I aim to achieve or details about my system if necessary. Also, I am really enjoying the code that generates these tests in the main.c file mentioned earlier. I feel like it is a much more graceful solution to running these tests than other l4 systems I've worked with. Thanks again, Matt

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Re: [seL4] Fault Tolerant Operating System for ______________
by da Tyga 19 Sep '14

19 Sep '14

> > Date: Thu, 18 Sep 2014 15:58:29 +0800 >> From: XilongPei(???) <pei_xilong(a)tongji.edu.cn> >> To: "'Aniruddha Bhide'" <aniruddha.360(a)gmail.com>, "'Peter Chubb'" >> <peter.chubb(a)nicta.com.au> >> Cc: devel(a)sel4.systems >> Subject: [seL4] ??: x86 Bootable USB install >> Message-ID: <007c01cfd316$565647b0$0302d710$(a)tongji.edu.cn> >> Content-Type: text/plain; charset="utf-8" >> Hi, >> I am at Tongji University (China, http://www.tongji.edu.cn/english/ ), I >> want to build a Fault Tolerant Operating System for high speed railway. >> >> The seL4 is just a micro-kernel operating system, there is still no >> centre-service to let it work as a PC operating system, and it still can?t >> work as a virtual-machine, such as VirtualBox. There are a lot of works >> should be done before seL4 used as a really operating system. >> >> Xilong Pei >> 2014/9/18 > > > > You are correct. seL4 is a microKernel upon which an operating system could be built. Instead of writing a proprietary OS for your high speed railway (of which there are several already in operation, e.g in France, Germany) you might want to consider porting an existing OS to run on top of seL4, or even better build your specific requirements on top of a robust OS such as those found at http://cog.systems/products.shtml.

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[PATCH] trivial: remove redundant newline in fail() calls.
by Eduard Nicodei 19 Sep '14

19 Sep '14

Hello, I have noticed certain fail() calls include newline. This does not seem necessary since fail() is defined as printf( "seL4 called fail at %s:%u in function %s, saying \"%s\"\n", file, line, function, s ); Which causes affected error messages to contain a single " character on a new line. Patch attached. Regards, Eduard Nicodei

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Sel4 on Pi
by Robert Clove 09 Sep '14

09 Sep '14

Hi All, I am all new to this raspberry pi.I was trying to port sel4 ( https://github.com/seL4/seL4) on raspberry pi but the build instruction ( http://sel4.systems/Hardware/General/) are only for another board. Has anyone successfully ported sel4 on pi. Please guide me Another query does sel4 has networking stack? Regards

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Devel September 2014