[flashrom] SB700 IMC disabling

[Bao, Zheng]

Sorry, I don't have any idea about imc accessing.


Zheng

> -----Original Message-----
> From: Carl-Daniel Hailfinger
[mailto:c-d.hailfinger.devel.2006 at gmx.net]
> Sent: Thursday, August 19, 2010 6:10 PM
> To: flashrom; Bao, Zheng; Matthias Kretz
> Subject: [flashrom] SB700 IMC disabling
> 
> Hi Zheng,
> 
> running flashrom on certain systems with SB700 family chipsets will
> result in read and write corruption. I have added a corruption check
to
> latest flashrom, and it seems that the IMC will access flash even if
> flashrom holds the BiosSemaphore (LPC bridge config space register
0x40,
> bit 5).
> 
> Matthias Kretz owns a Supermicro H8DGT with this problem, but other
> boards (including a MITAC development board) exhibit the same issue.
> If we use flashrom to write, the SPI registers (especially FIFO
counter
> and FIFO) will lock up after some time, and we have not been
successful
> in getting the stuck board working again.
> 
> Is there a way to stop the IMC from the host or to stop all IMC flash
> accesses (including read and instruction fetch)?
> 
> Regards,
> Carl-Daniel
> 
> --
> http://www.hailfinger.org/
>