[LinuxBIOS] flashrom erase failed

[Lane Brooks]

I am trying to flash an SST49LF008A on a board with a Geode CS5536AD 
southbridge using flashrom.  It reads fine, but when I try to write, it 
failed with an ERASE FAILED message.  Any ideas on why?

Thanks,
Lane Brooks

[ron minnich]

On 9/29/07, Lane Brooks  wrote:
> I am trying to flash an SST49LF008A on a board with a Geode CS5536AD
> southbridge using flashrom.  It reads fine, but when I try to write, it
> failed with an ERASE FAILED message.  Any ideas on why?

this usually implies a write disable jumper of some sort -- maybe GPIO
controlled.

thanks

ron

[Marc Jones]

Lane Brooks wrote:
> I am trying to flash an SST49LF008A on a board with a Geode CS5536AD 
> southbridge using flashrom.  It reads fine, but when I try to write, it 
> failed with an ERASE FAILED message.  Any ideas on why?
>
> Thanks,
> Lane Brooks

Lane,
Geode systems write protect the BIOS via RCONFs (cache settings similar 
to MTRRs). Change MSR 0x1808 top byte to 0x22. Then run flashrom.
> rdmsr 0x1808

MSR register 0x1808 => 25:ff:fc:02:13:f7:df:00
> wrmsr 0x1808 22:ff:fc:02:13:f7:df:00

MSR register 0x1808 => 22:ff:fc:02:13:f7:df:00

Marc