On 10/07/2010 01:18, [email protected] wrote:
Hello,
Just messed up a little bit with the code. Seems that the whole region f0000-
fffff is write-protected. No idea what is actually stored in it and why it is
write-protected apart it being rewritten by the HP flash utility when upgrading
(but not when downgrading). So didn't find out anything, sad :|
Best regards,
Julius
The top 64KB (or 16KB on older boards) is often used to contain the
'bootblock' by an OEM BIOS. This contains just enough code to verify the
rest of the BIOS image and if a problem is detected to launch a means to
flash in a new image. It is very often protected with a GPIO or jumper
to control a write protect line to the flash device. When updating an
OEM BIOS containing a bootblock it would not normally update the
bootblock ever as that would risk making the recovery mechanism unusable
so I am surprised when you say that the HP flash utlility updates it on
an upgrade.
Andrew
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