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Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA ver
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version |
Date: |
Tue, 10 May 2016 21:00:11 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0 |
On 05/10/16 19:36, Richard W.M. Jones wrote:
> On Tue, May 10, 2016 at 07:24:28PM +0200, Paolo Bonzini wrote:
>>
>>
>> On 09/05/2016 18:48, Richard W.M. Jones wrote:
>>>
>>> Of course we're well outside any standards here. Can we tell clang
>>> users to use the GCC/pre-compiled option ROMs :-? Any other ideas? I
>>> don't think I've missed a flag (GCC has -fno-toplevel-reorder, but
>>> clang 3.8 doesn't ...)
>>
>> I guess the checksumming script (scripts/signrom.py) could take care of
>> padding the file to a multiple of 512 bytes, and fill in the size in the
>> third byte. Then "_end" would not be necessary anymore and -m16 could
>> replace the .code16 directive.
>
> In my rather limited testing on gcc, gcc -m16 broke booting. However
> I've not investigated this further. I'll do so shortly.
>
> However I have a question: is there a formal standard or documentation
> for the option ROM format? Are we sticking to the (ancient) "BIOS Boot
> Specification" or is there something newer? (My copy is from 1996).
To my knowledge, the most recent specification that describes PCI
expansion ROMs is:
PCI Firmware Specification
Revision 3.2
January 26, 2015
See Chapter 5, "PCI Expansion ROMs".
(Maybe a newer release has been made, not sure.)
Of course, this spec is not public (you have to be a PCI SIG member to
get it, or some such, which costs $$$), but since Red Hat is a member,
I'll send you a link off-list (and you can't share the PDF outside of
RH, of course).
Regarding general (device independent) oproms: I'm not sure.
Thanks
Laszlo
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Marc MarĂ, 2016/05/08
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Stefan Hajnoczi, 2016/05/09
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Stefan Hajnoczi, 2016/05/09
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Richard W.M. Jones, 2016/05/09
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Richard W.M. Jones, 2016/05/09
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Laszlo Ersek, 2016/05/09
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Richard W.M. Jones, 2016/05/09
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Paolo Bonzini, 2016/05/10
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Paolo Bonzini, 2016/05/10
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version, Richard W.M. Jones, 2016/05/10
- Re: [Qemu-devel] [PATCH v6] Add optionrom compatible with fw_cfg DMA version,
Laszlo Ersek <=