I believe, sometime the SB eat some byte...write to LPC.
On 8/3/05, Andi Kleen firstname.lastname@example.org wrote:
On Wed, Aug 03, 2005 at 09:50:49AM -0700, yhlu wrote:
You need split mess into two seperate thing
- 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
- 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.