snip
I'm trying to flash the ROM externally now, but it's telling me it
can't
disable block protection. It gets as far as trying to erase 0x600000,
then
goes through all the erase functions, finally crapping out. Do you
know
how
I can work-around that?
The write protect screw is removed, right? After that the flash's
write protect register needs to be updated. Do you know the status
register values? Flashrom should be able to do that.
Yes, it is definitely removed - I didn't put it back in after the
initial
brick. It says the register value is 0x94 - I did also hook up the Bus
Pirate for use with statically linked ChromeOS Flashrom (as the
particular
version I have doesn't have Dediprog support) - I had an idea running
--wp-disable might help, but it didn't recognise the chip and said the
register was already 0x94 (paraphrasing). I am currently compiling a
newer
statically linked version of ChromeOS Flashrom using the SDK, in the
hope
that might be able to do the job. Am I barking up the wrong tree
though, or
is there something else I could do?
You are in the right spot. The fact that it failed at 6MiB is very
indicative of the SPI part write protection. There are, however, more
than one status register. There should be 3 of them:
Read Status Register-1 (05h), Status Register-2 (35h) & Status
Register-3 (15h)
Btw, I'm referencing W25Q64FW datasheet.
-Aaron
Yeah, using --wp-status with Clapper's Flashrom tells me that the write
protect *is* enabled, after all. But I can't see where, apart from the
screw I took out right next to the battery, the write-protect screw
would be? And I'm confused as to why it let me write initially if the
write-protect wasn't enabled.
This is the output I get trying to run --wp-disable:
w25_set_srp0: old status: 0x94
w25_set_srp0: new status: 0x94
w25q_disable_writeprotect(): error=1.
No -i argument is specified, set ignore_fmap.
FAILED
Setting SPI voltage to 0.000 V
restore_power_management: Re-enabling power management.
I've sorted it out now - had to bridge pins 3,7 and 8 using a large
paper-clip, as alluded to in the OSCON presentation, referenced by Barry
Schultz. Never had to do that before, oddly.
--
coreboot mailing list: [email protected]
http://www.coreboot.org/mailman/listinfo/coreboot
