[Linaro-acpi] Touching the initrd before paging_init

[jcm@redhat.com (Jon Masters)]

On 12/15/2015 11:28 AM, G Gregory wrote:
> On 15 December 2015 at 16:13, G Gregory <graeme.gregory@linaro.org> wrote:
>> On 15 December 2015 at 15:36, Jon Masters <jcm@redhat.com> wrote:
>>> On 12/15/2015 06:19 AM, G Gregory wrote:
>>>
>>> <below refers to the GRUB-based approach not the initrd override>
>>>
>>>> Tried it, results were not great :-(
>>>>
>>>> set root='hd0,gpt2'
>>>> insmod acpi
>>>> acpi /DSDT.aml
>>>> linux /Image-leg earlycon=pl011,0xe1010000 console=ttyAMA0 acpi=force root
>>>> =/dev/sda2
>>>
>>> <snip>
>>>
>>>> [    0.000000] PC is at setup_arch+0xfc/0x564
>>>> [    0.000000] LR is at setup_arch+0xf8/0x564
>>>
>>> <snip>
>>>
>>> So we unmask SError in setup_arch, which happens now later enough that
>>> it'll come out of the UART where you can see it. However there are still
>>> occasions on some of these early platforms where an unhandled SError can
>>> exist as GRUB exits. I have seen that a number of times on Seattle if
>>> there's a pending error from one of the IO IP blocks on the SoC You
>>> might need a firmware update, but can you also confirm that this
>>> happened reproducibly?
>>>
>> It is Seattle RevB I am using and it is repeatable. I have pre-release
>> firmware on there!
>>
> Repeatable on ROD0084E as well.

I'll try it on a couple of other platforms later this week. I've
pondered before whether GRUB should unmask SError and report this prior
to entering the kernel, because today Linux always gets the blame ;)

Jon.