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

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Russell,

On 08/18/2015 04:13 AM, Russell King - ARM Linux wrote:
> On Mon, Aug 17, 2015 at 08:09:17PM -0700, santosh.shilimkar@oracle.com 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.
>
Thanks for your input.

The patch works now once I move the local_abort_enable() to later just 
before calling reserve_crashkernel() in setup_arch(). The abort handler 
gets called right after enabling it which means it has happened even 
before reaching here.

I have added the abort handler to u-boot code and I get the same abort 
which means the root cause is u-boot or ROM boot loader. I would try to 
debug if root cause is u-boot. If it is ROM boot loader, I will have to 
add a work around in u-boot or Linux. Is there a preference of one over 
the other? The exception handling in u-boot is premature and will 
require more work to add a work around. Is there still a possibility of 
adding the work around in Linux?

-- 
Murali Karicheri
Linux Kernel, Keystone
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[PATCH] ARM: keystone: add a work around to handle asynchronous external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-11 21:20 +0200
  Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-08-14 16:10 +0200
    Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Lucas Stach <l.stach@pengutronix.de> - 2015-08-14 16:30 +0200
      Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-15 00:00 +0200
        Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-08-15 00:00 +0200
          Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-17 16:20 +0200
    Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort santosh shilimkar <santosh.shilimkar@oracle.com> - 2015-08-14 17:20 +0200
      Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-08-15 00:00 +0200
        Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-18 00:20 +0200
          Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-08-18 00:50 +0200
          Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort "santosh.shilimkar@oracle.com" <santosh.shilimkar@oracle.com> - 2015-08-18 05:20 +0200
            Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-08-18 10:20 +0200
              Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Lucas Stach <l.stach@pengutronix.de> - 2015-08-18 10:30 +0200
                Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Afzal Mohammed <afzal.mohd.ma@gmail.com> - 2015-08-18 14:10 +0200
              Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Jisheng Zhang <jszhang@marvell.com> - 2015-08-18 10:40 +0200
                Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-18 17:00 +0200
              Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-18 22:30 +0200
      Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-15 00:00 +0200
        Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort "santosh.shilimkar@oracle.com" <santosh.shilimkar@oracle.com> - 2015-08-15 02:10 +0200
  Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-14 16:10 +0200
    Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Lucas Stach <l.stach@pengutronix.de> - 2015-08-14 16:20 +0200
      Re: [PATCH] ARM: keystone: add a work around to handle asynchronous  external abort Murali Karicheri <m-karicheri2@ti.com> - 2015-08-17 16:20 +0200

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