[LinuxBIOS] BIOS Saver RD1

Andi Kleen ak at suse.de
Wed Aug 3 21:53:16 CEST 2005

On Wed, Aug 03, 2005 at 09:50:49AM -0700, yhlu wrote:
> You need split mess into two seperate thing
> 1. does flash_rom support your MB, some mb has gpio to disable the
> flash write or last 64KiB
> 2. are you give dead bios savior.
> ps. other thing about flash_rom
> 1. with 2.6 kernel 64 bit for amd8111 based MB, you can not install 4G
> or more in CPU0.
> 2. with 2.6 kernel 64 bit for Nvidia ck804 based MB, you must install
> 4G or more in CPU0
> solution is use 32 bit 2.6 or 2.4 32bit or 2.4 64 bit.
> for case 1 you can command line: maxmem to limit mem to 4G less.
> It seems last 4KiB near 4G can not be accessed. when read in Linux it
> alreays show 0.
> Andi may have some idea about it. maybe something related iommu...

IOMMU is not involved here. Me and Torsten looked at it some time ago
and we suspected a chipset issue because there was nothing obviously
special with the way that memory was mapped via /dev/mem.


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