[coreboot] [Bug?] 3 different bytes in VGAbios after upgrade to coreboot
Vladimir
quickcracktime at gmail.com
Sun Jun 7 02:12:06 CEST 2015
Thank you very much for solving this riddle!
And one more question for Rudolf: please tell, are you using atomDis
utility to disassemble atombios into C code? Or there are some other
special tools, which probably have more recent versions? (latest version of
atomDis is already 4 years old...)
On 3 June 2015 at 20:27, Rudolf Marek <r.marek at assembler.cz> wrote:
> Hi all,
>
> First byte after IBM is usually a checksum. So in fact only two bytes
> differ.
> Now you may ask what it is... and it is a IOBASE :)
>
> typedef struct _ATOM_ROM_HEADER
> {
> ATOM_COMMON_TABLE_HEADER sHeader;
> UCHAR> uaFirmWareSignature[4]; /*Signature to distinguish between
> Atombios
> and non-atombios,atombios should init it as "ATOM", don't change the
> position */
> USHORT usBiosRuntimeSegmentAddress;
> USHORT usProtectedModeInfoOffset;
> USHORT usConfigFilenameOffset;
> USHORT usCRC_BlockOffset;
> USHORT usBIOS_BootupMessageOffset;
> USHORT usInt10Offset;
> USHORT usPciBusDevInitCode;
> USHORT usIoBaseAddress; <---------------this changes
>
> I guess IOBASE of PCI device changes also...
>
> USHORT usSubsystemVendorID;
> USHORT usSubsystemID;
> USHORT usPCI_InfoOffset;.
> USHORT usMasterCommandTableOffset; /*Offset for SW to get all command
> table
> offsets, Don't change the position */
> USHORT usMasterDataTableOffset; /*Offset for SW to get all data table
> offsets, Don't change the position */
> UCHAR ucExtendedFunctionCode;
> UCHAR ucReserved;
> }ATOM_ROM_HEADER;
>
> You can use atomDis to dump it I guess (Did not check if it dumps also the
> header.
>
> Thanks
> Rudolf
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.coreboot.org/pipermail/coreboot/attachments/20150607/214e321c/attachment.html>
More information about the coreboot
mailing list