[coreboot] [flashrom] Transaction Error with opcode 0x03 failed...
stanne at gmail.com
Fri May 8 11:42:46 CEST 2009
Thanks for the guidance.
Not sure if Is there any more useful documentation beside the datasheet of
the ICH9 that i can refer to to read more about SPI chip programming?
On Fri, May 8, 2009 at 12:03 AM, FENG Yu Ning <fengyuning1984 at gmail.com>wrote:
> Stan Yong wrote:
> > i'm thinking of modifying the FRAP register value in order to enable
> > and read permission to all the region.
> (I don't like giving discouraging information. I have given much.)
> I am afraid that it could not be done if datasheet is correct.
> As you may have read in the datasheet, FRAP in the chipset is a
> shadowing register, it is read-only. The original data is in region
> 0(flash descriptor) of the flash chip, being read during chipset
> initialization. Since region 0 is also write-protected, flashrom
> cannot change it. That is a cycle.
> > How to exactly use flashrom to bring the SPI into descriptor mode so that
> > can do a read and write to FRAP?
> I have some words here because I think you might misunderstand something.
> The SPI controller sets itself in descriptor mode when it sees some
> mark in the flash chip during initialization. It does not need
> flashrom to bring it into d-mode. And as a memory-mapped register,
> FRAP can be read regardless of the mode it is in.
> yu ning
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