[Xenomai] Xenomai on Atmel SAMA5D3 with a 3.14 kernel

Maxime Ripard maxime.ripard at free-electrons.com
Tue Jun 10 11:10:28 CEST 2014


On Sat, Jun 07, 2014 at 04:34:34PM +0200, Gilles Chanteperdrix wrote:
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> On 06/06/2014 04:00 PM, Maxime Ripard wrote:
> > On Fri, Jun 06, 2014 at 03:59:12PM +0200, Maxime Ripard wrote:
> >> 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?
> > 
> > 
> > Actually, the boot seem just to be *much* slower, so maybe the 
> > timers are working after all, but it's just yet another issue with 
> > the clocks.
> > 
> Does __ipipe_tsc_update get called in Linux timer interrupt?

Yes, it does.

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