I think the only thing you can't do in linux is manage the MMU, since sel4 reserves that task to itself (plus it's a ring 0 operation and sel4 IIRC runs guests, even the linux kernel, as ring 3)

What I'm not so sure about is I/O capabilities.

Does seL4 require a system call to do I/O or can seL4 manipulate a task's IO permission bitmap?

If the former, I think you could tie an exception handler to the linux kernel and use that to emulate any privileged opcodes.

On Mon, Jan 4, 2016 at 1:35 PM, Julien Delange <julien.delange@gmail.com> wrote:
So, there is no chance for running linux on top of sel4 on a beagleboard black?

On Mon, Jan 4, 2016 at 4:30 PM, Peter Chubb <peter.chubb@nicta.com.au> wrote:
>>>>> "Andrea" == Andrea Sorbini <asorbini@rti.com> writes:

Andrea> I can confirm from experience that seL4 supports both serial
Andrea> and ethernet on the FreeScale Sabre Lite i.MX6 board (although
Andrea> through some buggy, GPL'd, drivers for ethernet).  No idea
Andrea> about USB nor running Linux on top of seL4.

For running virtualised environments, you need a platform with the ARM
virtualisation extensions -- a Cortex A53, A15 or A7.  Our preferred
platform was the Odroid XU; as this has been discontinued, we're
looking around for a different readily available platform, preferably
with a System MMU to protect all DMA.  It's looking like the Nvidia
Tegra TK1 will be apropriate, but we haven't started the port yet.

Dr Peter Chubb         Tel: +61 2 8306 0552      http://www.data61.csiro.au
http://www.ssrg.nicta.com.au   Software Systems Research Group/NICTA/Data61

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