Re: [Qemu-devel] [PATCH v1 2/3] arm: fix the armv7m reset state

[KONRAD Frederic <frederic.konrad@adacore.com>]

On 07/03/2017 10:51 AM, Peter Maydell wrote:
> On 3 July 2017 at 08:31, KONRAD Frederic <frederic.konrad@adacore.com> wrote:
>> On 06/30/2017 11:06 AM, Peter Maydell wrote:
>>> On 30 June 2017 at 09:24, KONRAD Frederic <frederic.konrad@adacore.com>
>>> wrote:
>>>> If I choose (b) I won't be able to load it to SRAM and it is
>>>> basically the same result I'll need to move or modify the config.
>>>
>>>
>>> I don't understand this, though. Option (b) is probably painful
>>> to implement (I don't have a good idea of how to do it) but
>>> it ought to mean that the ELF files that work on the board
>>> also work for QEMU (regardless of how the board model
>>> implemented the aliased flash).
>>>
>>
>> Yes that's exactly what I want.
>>
>> Basically the 0x00000000 alias can point to the SRAM or the ROM
>> during the reset depending on some boot config. The ELF is
>> directly loaded in the ROM or in the SRAM and my patch allows to
>> fetch the two first words in the reset handler to make it work
>> for any boot config.
> 
> Yes, but it only works if you implemented it that way
> round, and not for board implementations which put the
> real device at 0 and the alias at high memory. I'd like a fix
> which deals with all of this, not just with the particular
> arrangement your board implementation has.

Ok got it, I'll check if I can do something clean which can
handle both ways.

Fred

> 
> thanks
> -- PMM
>