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Re: [Qemu-devel] vexpress-a9: coreboot is unable to push any data on sta

From: Peter Maydell
Subject: Re: [Qemu-devel] vexpress-a9: coreboot is unable to push any data on stack
Date: Sat, 16 Aug 2014 12:19:21 +0100

On 16 August 2014 10:50, Piotr Król <address@hidden> wrote:
> On Fri, Aug 15, 2014 at 11:54:55PM +0100, Peter Maydell wrote:
>> I'm not looking for advocacy, just for an explanation of what it's
>> doing, and in particular whether anybody's ever tested this on real
>> hardware. (Running guest code only on QEMU is a recipe for bugs,
>> because our emulation is often not very accurate and if you only test
>> on QEMU you can end up accidentally relying on our bugs.)
> Creboot is an open source replacement for BIOS. Almost every supported
> board contain its own memory map. According to commit message from
> Chromium developer coreboot build for qemu vexpress-a9 was created to
> 'simplify testing ARM implementation (... and) to verify the boot loader
> functionality'. I think that code for real hardware got little in common
> with qemu implementation.

> I'm trying to use this implementation for pure educational purposes.
> Going back to my initial issues with stack, changing stack location to
> SRAM improves situation but does not fix booting. It looks like whole
> implementation assumes running from RAM.

It sounds like this guest code is just broken and needs fixing to
relocate itself into RAM somehow, then...

-- PMM

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