[flashrom] MX25L6445E erase and write failed!

[Stefan Tauner]

On Wed, 4 Mar 2015 11:32:04 +0200
Urja Rannikko <urjaman at gmail.com> wrote:

> Hi,
> 
> > I've an idea. Maybe you've managed to switch the MX25L6445E into the
> > "individual block protection mode" (read the datasheet page 30 - its
> > an OTP, once done once its for good) and now it isnt actually
> > erasing/writing anything at all (that 1M just happens to have
> > succeeded previously) because flashrom currently doesnt know of the
> > invidividual block unlock commands (or even the GBULK gang block
> > unlock) and thinks everything is ok because the status register looks
> > like unlocked.
> >
> > So maybe read the current contents into a file and modify a little bit
> > in the erased area (eg. swap out the first 4k to random data*) and see
> > if it writes. My theory is it wont.
> >
> > *here's example commands:
> > flashrom <insert your parameters> -r current.bin
> > dd if=/dev/urandom of=4krandom.bin bs=1024 count=4
> > dd if=current.bin bs=1024 skip=4 of=current-4.bin
> > cat 4krandom.bin current-4.bin > modified.bin
> > flashrom <parameters> -w modified.bin
> >
> > Somebody'd need to write a patch to flashrom to use the RDSCUR command
> > to see if WPSEL is set to see for sure. But support for this wouldnt
> > hurt anyways. I'll see if i have time later in the evening to make a
> > prototype/test patch for this...
> 
> I already had the datasheet open, so... here it is (in slightly crude form).
> https://github.com/urjaman/flashrom/commit/b51f09e5f21bf14d492c7d006e0bdd869eee36b9
> there's the commit if somebody wants to just web see.
> To test, in the flashrom-serprog git tree you have:
> git pull
> git checkout mx25l6445e-debug
> make
> ./flashrom ...

Hi,

was this ever tested? I have a MX25L25635F which is yet unsupported due
to the larger address space etc. and I could test this eventually some
time in the future... but I would prefer to get support for this into
flashrom earlier than that (2016? :)

-- 
Kind regards/Mit freundlichen Grüßen, Stefan Tauner