Re: [coreboot] coreboot image signature

[John Lewis]

Hi Benoit,

Please see https://www.coreboot.org/CBFS

Kind Regards,

John.

On 19/08/16 10:43, Benoit SANSONI wrote:
> Hi all,
>
> I would like to know if it is possible, via a signature or a magic
> number, in the coreboot.rom file to recognize that it is a "coreboot"
> file.
> I did not find anything in the Makefile.inc.
>
> Thanks in advance

coreboot image signature

[Łukasz Dobrowolski]

Bear in mind that on some mainboards (at least the one that I'm trying
to port) the beginning of the rom is occupied by EC firmware blob. On
x86 you could check the reset vector at 0xFFFFFFF0 but i don't know if
it's the same way with all architectures. Also You would have to
somehow tell the difference between vendor bios and coreboot rom.

To me it seems that storing cb roms with ".cbrom" extension would be
more practical.

coreboot image signature

[Zoran Stojsavljevic]

> Please see https://www.coreboot.org/CBFS

Hello John,
> From the pointer:* magic** is a 32 bit number that identifies the ROM as a

CBFS type. The magic number is 0x4F524243, which is 'ORBC' in ASCII.*

I did install on my F24 VM (in order to verify this info) wxHexEditor
source code package (wxHexEditor-v0.23-src.tar.bz2):
http://www.wxhexeditor.org/home.php

Please, you can all try it, there are some environmental catches/packages
and CCP flags (CCPFLAGS) to be added, but it is fairly manageable. Here is
how GUI looks like:

[image: Inline image 1]

Interesting enough, wxHexAuthor Erdem (U. Altinyurt) is a jobless computer
engineer, born and living since 1981,in Istanbul, Turkey. Why Erdem is
jobless, that is the (crucial) question??? ;-)

Zoran

On Fri, Aug 19, 2016 at 11:49 AM, John Lewis  wrote:
> Hi Benoit,
>
> Please see https://www.coreboot.org/CBFS
>
> Kind Regards,
>
> John.
>
> On 19/08/16 10:43, Benoit SANSONI wrote:
>
> Hi all,
>
> I would like to know if it is possible, via a signature or a magic number,
> in the coreboot.rom file to recognize that it is a "coreboot" file.
> I did not find anything in the Makefile.inc.
>
> Thanks in advance