[Xenomai] Xenomai on Atmel SAMA5D3 with a 3.14 kernel

[Maxime Ripard <maxime.ripard@free-electrons.com>]

Hi Gilles,

I've been experimenting these days with the i-pipe 3.14 kernel, and
current xenomai master branch on the Atmel SAMA5D3 SoC.

There's a few issues there, the first one being that
at91_ipipe_early_init crashes because of a NULL pointer
dereference. This is due to the clk_get_rate call on the clock
returned by clk_get(NULL, "mck").

This clk_get call cannot since 3.14 because the clock code has been
rewritten, and you can't use clkdev anymore.

This is quite simple to fix, and after actually fixing it, you get a
more interesting issue: either the timers or the interrupts don't work
at all.

The first symptom is that it get stuck at the delay loop
calibration. Setting the loops per jiffy in the command line make the
boot go further, until the switch to the ipipe_tsc clocksource. This
actually makes me think that it's more the timers that are broken
rather than the interrupts. Changing the timer counter block doesn't
solve anything.

Do you have an idea of what could be going on?

You'll find the boot logs here: http://pastebin.com/58N20Xxs

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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