Re: [PATCH] ARM: keystone: add a work around to handle asynchronous external abort

From: Jisheng Zhang
Date: Tue Aug 18 2015 - 04:32:59 EST


On Tue, 18 Aug 2015 09:13:34 +0100
Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote:

> On Mon, Aug 17, 2015 at 08:09:17PM -0700, santosh.shilimkar@xxxxxxxxxx wrote:
> > From the logs this seems to be mostly clock related issue for some
> > peripheral. If the bootloader clock enable all hack still exists,
> > may be you can try that out.
> >
> > Another way to debug this is to start disabling peripheral drivers
> > from the kernel 1 by 1 and see if the issue goes away.
>
> Highly unlikely to make any difference. As the failure happens soo early
> with the patch applied, the kernel hasn't had much of a chance to touch
> the hardware - about the only things are the decompressor and the kernel
> touching the early console. As they seem to be working, it suggests
> that's not the cause.
>
> It seems to be pointing towards something in the boot loader...
>
> Normally, uboot will hook itself into the vectors to report errors, but
> I wonder whether uboot enables asynchronous aborts while it's running.
> Don't forget to make sure that the aborts are disabled again prior to
> calling the kernel.
>

Another possible cause: trustzone software.

we root caused such kind of asynchronous external abort on Marvell Berlin SoCs
to a trustzone bug. I'm not sure whether keystone linux is running at normal
world or not.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/