Re: [Xenomai] imx28 linux 3.10.32 + ipipe v7 + GPIO IRQ machine freeze

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On Thu, Jan 29, 2015 at 11:46:50AM +0100, Gilles Chanteperdrix wrote:
> On Thu, Jan 29, 2015 at 09:46:13AM +0100, Gautier HAOUY wrote:
> > Hello everyone,
> > 
> > I am kindly requesting your help today as I am facing a complete freeze on
> > an Freescale iMX28 based board (armadeus APF28-Dev).
> > I have developed a very simple kernel module which registers a GPIO
> > interrupt handler, working properly on linux 3.10.32 kernel.
> > The same code, compiled on a 3.10.32 + ipipe7 (also tested on ipipe v4)
> > patched kernel generates a machine freeze on IRQ reception, without message
> > and any other possibility than resetting the board.
> > 
> > I would appreciate any help/hint/procedure I could use to dive into the
> > problem and solve it.
> > Hoping to help others afterwards,
> > Best regards,
> > G0TieR.
> 
> What is the problem exactly. Only applying the I-pipe patch breaks
> the GPIOs, or you need to compile the kernel with CONFIG_IPIPE?

I assume the latter. Please replace the calls to generic_handle_irq
with ipipe_handle_demuxed_irq in drivers/gpio/gpio-mxs.c. The change
got forgotten when the gpio file moved to drivers/gpio it seems.

-- 
					    Gilles.