New subject: [Non-DoD Source] Devel Digest, Vol 65, Issue 5

4 Oct 2019

      I have noticed this also.
Thad
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From: Devel [devel-bounces@sel4.systems] on behalf of devel-request@sel4.systems [devel-request@sel4.systems]
Sent: Thursday, October 03, 2019 8:24 AM
To: devel@sel4.systems
Subject: [Non-DoD Source] Devel Digest, Vol 65, Issue 5
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Today's Topics:
1. Re: Zynq UltraScale+ locks up after hours running
      (Shen, Yanyan (Data61, Kensington NSW))
   2. Re: How to use sel4runtime
      (Millar, Curtis (Data61, Kensington NSW))
   3. Re: Zynq UltraScale+ locks up after hours running
      (Leonid Meyerovich)
----------------------------------------------------------------------
Message: 1
Date: Thu, 3 Oct 2019 06:43:52 +0000
From: "Shen, Yanyan (Data61, Kensington NSW)"
        Yanyan.Shen@data61.csiro.au
To: "lmeyerovich@i-a-i.com" lmeyerovich@i-a-i.com,
        "devel@sel4.systems" devel@sel4.systems
Subject: Re: [seL4] Zynq UltraScale+ locks up after hours running
Message-ID:
        78ebf24ad9274ca75e18b5fca8575a09bc423b82.camel@data61.csiro.au
Content-Type: text/plain; charset="utf-8"
Hi Leonid,
Could you provide a bit more about your software configuration? For
instance, do you have multiple VMs running on dedicated hardware cores?
How are the VM and processes configured?
Also, you mean there were no interrupts at all on all the four cores?
Regards,
Yanyan
On Wed, 2019-10-02 at 16:01 +0000, Leonid Meyerovich wrote:
...
Hello,
We are running seL4 microkernel on 4 cores Zynq UltraScale+ (zcu102
board). The implementation includes multiple processes, hypervisor
and virtual machine running on dedicated core. After several hours
running (it could be 2 or even 8 hours) the whole microkernel locks
up. After some investigation I have found that no interrupts
generated anymore - at least there is no interrupts coming to ISR.
Inside ISR I have monitored PL2 Physical Timer Control register,
which feeds a scheduler and didn't find any problems - it stays
enabled and not masked.
I will appreciate any idea/direction for approaching this problem.
Thank you,
Leonid
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Message: 2
Date: Thu, 3 Oct 2019 07:04:41 +0000
From: "Millar, Curtis (Data61, Kensington NSW)"
        Curtis.Millar@data61.csiro.au
To: "devel@sel4.systems" devel@sel4.systems
Subject: Re: [seL4] How to use sel4runtime
Message-ID:
        ad55f3a5de7838e0f9d16a94905647a0ead42249.camel@data61.csiro.au
Content-Type: text/plain; charset="utf-8"
Hi Baltazar,
...
Another (less exclusively RISC-V related, though I am targeting RISC-V
still) question - I've been trying to figure out the sel4runtime repo,
but I'm a bit confused on how to set it up. Specifically:

How much of a "minimal seL4 environment" do I need to initialize
first?

The sel4runtime is a minimal C runtime specifically for seL4. It handles
the initialization of all applications (root servers and System-V ELF
processes) on an seL4 system.
A minimal project will require a repo project containing seL4,
seL4_tools, musl, and sel4runtime (along with a root task application).
sel4runtime is then used as the C runtime for all applications built in
the project and is responsible for providing the entrypoints and calling
into the main function.
...

Do does my program with main() also need to specify a root task, or
is that part of the minimal environment?

You will still need to provide a root task application. sel4runtime is
only responsible for handling process startup for C applications.
...

Is there a specific recommended location for the sel4runtime repo?

The sel4runtime repo is usually placed in the projects directory. You
can see sel4-tutorials-manifest[^1]  repository on github for an example
of how the dependecies are laid out.
[^1]: https://github.com/SEL4PROJ/sel4-tutorials-manifest
Cheers,
Curtis Millar
Systems Engineer,
Trustworthy Systems, CSIRO's Data61
curtis.millar@data61.csiro.au
Data61, CSIRO
Level 3, K17 Building
UNSW Gate 14, Barker St
Kensington NSW 2033 Australia

Re: [seL4] [Non-DoD Source] Devel Digest, Vol 65, Issue 5