Enabling Dediprog by default in flashrom

[Stefan Tauner]

Hi,

the release of flashrom 0.9.7 is imminent and I would really like to
enable the Dediprog programmer by default. Carl-Daniel informed me that
the only problem is that we do not know which opcode is actually used
for reading on the SPI bus. It could be that we initiate a fast read
(0x0b) instead of a normal read (0x03). This would work with the
majority of flash chips but would not with others where flashrom
should normally work. Since we are not sure we don't want to enable it
without further consideration/testing/warning messages. Furthermore
not all chips supporting fast read have this fact noted in their
datashets. So testing any apparently non-fast read chip does not
suffice. We would rather be able to check the opcode on the SPI bus
with a logic analyzer directly. Are there any Dediprog users who can
help us with that please?

[coreboot] Enabling Dediprog by default in flashrom

[Alexandre Pereira da Silva]

I think its safe to use a read opcode by default.

The DediProg can't reach high clock rates, well below the limit for the
normal read on most memories.

I have a DediProg available for testing.

Thanks.
Em 16/06/2013 11:10, "Stefan Tauner" 
escreveu:
> Hi,
>
> the release of flashrom 0.9.7 is imminent and I would really like to
> enable the Dediprog programmer by default. Carl-Daniel informed me that
> the only problem is that we do not know which opcode is actually used
> for reading on the SPI bus. It could be that we initiate a fast read
> (0x0b) instead of a normal read (0x03). This would work with the
> majority of flash chips but would not with others where flashrom
> should normally work. Since we are not sure we don't want to enable it
> without further consideration/testing/warning messages. Furthermore
> not all chips supporting fast read have this fact noted in their
> datashets. So testing any apparently non-fast read chip does not
> suffice. We would rather be able to check the opcode on the SPI bus
> with a logic analyzer directly. Are there any Dediprog users who can
> help us with that please?