[flashrom] flashrom Rangeley with WINDBOND25Q64

[Rich Futyma]

Hi,

In addition to what Stefan described about ME descriptors, there is also
BIOS CNTL register, that if BIOS
enables it, you will not be able to write to flash using flashrom.

Refer to:

Intel® C600 Series Chipset and
Intel® X79 Express Chipset

BIOS_CNTL—BIOS Control Register
(LPC I/F—D31:F0)

---
Rich


On Tue, Aug 12, 2014 at 3:07 PM, Stefan Tauner <
stefan.tauner at alumni.tuwien.ac.at> wrote:

> On Tue, 12 Aug 2014 12:15:53 -0400 (EDT)
> wenw at adiengineering.com wrote:
>
> > 0x54: 0x000f0000 FREG0: Warning: Flash Descriptor region
> (0x00000000-0x0000ffff) is read-only.
> > 0x58: 0x07ff0200 FREG1: BIOS region (0x00200000-0x007fffff) is
> read-write.
>
> Hello Wen,
>
> it seems like this bogus kind of descriptor layout becomes popular. Let
> me explain in case you don't understand: The descriptor region in the
> first 4kB of the flash chip - similar to a partition table - defines
> (among other things) which parts of the flash chip are used for what
> components. Usually all addresses of the flas chip are covered by this
> but sometimes vendor forget to do this properly - or do have no use for
> it.
>
> The problem (for flashrom) is that the Intel SPI controllers forbid
> accesses to addresses that are not covered by the descriptor regions -
> like 0x00010000 to 0x001FFFFF in this case, which is almost a quarter
> of the flash chip - but flashrom tries to read the whole chip
> nevertheless (for good reasons).
>
> So flashrom works more or less as expected on that board as far as you
> have tested it. That result is probably not very useful to you, but
> fine with me for now... :)
>
> If you want to be able to write to the BIOS region, you
> will also need my layout patches (they are also on github), and also
> set the read_all_first variable in doit() in flashrom.c to 0.
> I'd welcome such further tests of course but please be prepared for
> recovery if need be.
>
> I have included Marc from Sage because I guess he may be able to tell
> us about the reason for this.
> --
> Kind regards/Mit freundlichen Grüßen, Stefan Tauner
>
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