[LinuxBIOS] Fwd: Intel Southbridge ROM Protection mechanism

[Darmawan Salihun]

---------- Forwarded message ----------
From: Darmawan Salihun 
Date: Apr 22, 2007 8:15 AM
Subject: Re: [LinuxBIOS] Intel Southbridge ROM Protection mechanism
To: Stefan Reinauer

On 4/20/07, Stefan Reinauer  wrote:
> Darmawan Salihun  [070419 19:22]:
> > the matter, does Intel ICH5 southbridge  (or other newer Inte
>
> southbridge)
> > still protects (probably mirrors) the last 8KB block (bootblock) in the
>
> BIOS
> > chip even when the protection bits in Block Locking Registers (BLRs) has
>
> been
> > disabled?
> >     I experienced weird results between several flashing attempts using
> > flashrom in Linux. SOme succeeded, some retain the original values.
>
> Anyone has
> > an explanation on the issue?
>
> Some flash chips support "write protecting" their boot block (and/or other
> blocks). I think the data sheets have more details on this.
>
> What flash chip are you using?

Winbond W39V040FA

Usually if the south bridge or a GPIO does the protection, you'd be able
> to write all or nothing. AFAIK

At some points I couldn't write at all. Maybe there is a a timing issue in
the code that I added. Gonna check it again.
>