[LinuxBIOS] flash issue with AMD Ref board

beneo beneo at comcast.net
Thu May 12 04:14:02 CEST 2005

EEPROM is SST 48LF004.

I install 2GB to CPU0 and 2GB to CPU1. I use 512MB DIMM, 4 DIMM per CPU, so total should be 4GB. But linux command cat /proc/meminfo report one 2 GB when using LinuxBIOS.

I have two opteron CPU, I'm not sure the version though.



  ----- Original Message ----- 
  From: YhLu 
  To: beneo ; linuxbios at openbios.org 
  Sent: Wednesday, May 11, 2005 7:27 PM
  Subject: RE: [LinuxBIOS] flash issue with AMD Ref board

  what is EEPROM in your BIOS socket?

  How do you install your DIMM? 4x1G in CPU0?

  What is your cpu version?


    From: beneo [mailto:beneo at comcast.net] 
    Sent: Wednesday, May 11, 2005 6:57 PM
    To: linuxbios at openbios.org
    Subject: [LinuxBIOS] flash issue with AMD Ref board

    I'm playing with the AMD seranede board. The flash_and_burn utility can not program linuxBIOS to the flash. but I can read the linuxbios and save to a file correctly.

    If I boot from AMI BIOS, using same utility, I can program a linuxBIOS into the flash. That made me believe some setting by linuxBIOS on the AMD Ref board is not right. I just don't know what.

    I used gdb to trace the code, Flash_and_burn utility enables flash by program two AMD Southbridge 8111 registers, One for enable 4MB window to flash (DevB, 0x43), one for enable write to the flash (DevB, 0x40). I checked the AMD datasheet, it seems all it need. But if I boot with LinuxBIOS, the flash erase command has no effect. with AMI BIOS, I can sucessfully erase a sector. 

    could anybody give me some pointer on what to check? 

    I should add, the linuxBIOS only reports 2GB memory when I really have 4GB in the system. I don't know if this have something to do with my issue.




  LinuxBIOS mailing list
  LinuxBIOS at openbios.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.coreboot.org/pipermail/coreboot/attachments/20050511/1ae485cc/attachment.html>

More information about the coreboot mailing list