[flashrom] Re: Flashrom (from freedos-user mailing list)

[Betibeteka Beranduetxea]

Ooops... here's the attachment

El mié, 17 nov 2021 a las 23:51, Betibeteka Beranduetxea (<
[e-mail]>) escribió:
> Hi,
>
> This is what I'm getting:
>
> https://aliexpress.com/item/1005001614869060.html (adapter)
> https://aliexpress.com/item/32725360255.html (burner + clamp,dirty cheap,
> I wanted the clamp, couldn't resist it)
> https://es.aliexpress.com/item/1005002412971490.html (puller)
>
> About the chip: It seems to me that it could be this (please see
> attachment) However i looked for it on the web and it seems to be a 4 MB
> chip, while flashrom-listed one would be 512 KB? I hope it will be right...
>
> If I'm getting it right, FreeDOS 1.3RC4 includes flashrom? It would be
> nice to put anything BIOS-related on a salvaged laptop disk. Perhaps with a
> DOS boot partition. Hell, last time I flashed a BIOS was almost a decade
> ago, and I really never played with DOS much more than just doing a win98
> boot floppy. But, it could be interesting to do and to have a little hard
> disk ready for flashing any BIOS I could play wildly with at least 2-3
> machines.
>
> Does FreeDOS flashrom work fine? Or  are there any known bugs?
>
> Best wishes
>
> El mié, 17 nov 2021 a las 16:19, Ivan Ivanov ()
> escribió:
> > Regarding the flashing equipment (test clip, programmer) - you could
> > refer to
> > http://dangerousprototypes.com/docs/Flashing_a_BIOS_chip_with_Bus_Pirate
> > . There's a SOIC8 test clip with 2.54mm bent pins, so that you can use
> > any 1P wires of any length and material (preferably copper), and
> > CH341A programmer with a green PCB.
> >
> > You'd need to re-check this, but it seems to me that flashrom doesn't
> > support PMC Pm49FL004T : although not sure, I could only find messages
> > like this one:
> > https://mail.coreboot.org/pipermail/flashrom/2014-May/012437.html
> > . The question is, could this chip be replaced with another
> > alternative chip that's supported by flashrom? But, if you'll still
> > need to read the existing firmware from Pm49FL004T , then you may have
> > to get a proprietary programmer (that'll be really overpriced in
> > comparison to $2 CH341A).
> >
> > ср, 10 нояб. 2021 г. в 21:00, Betibeteka Beranduetxea <
> > [e-mail]>:
> > > Hi
> > >
> > > Thank you very much for the heads-up about flashrom.
> > >
> > > As said, motherboard is OK with flashrom, but I'm unable to find my
> >
> > BIOS chip on the supported hardware list.
> > > These are the numbers on the chip:
> > > PMC.
> > > 0639
> > > Pm49FL004T-33JCE
> > >
> > > As you look much more fluent than me on this matter, could you give any
> >
> > pointer to that chip or an equivalent one?
> > > I looked for the PLCC puller on aliexpress and I have seen some cheap
> >
> > ones, but, would you mind to give me any pointer, should you have any
> > preferences. Same for the programmer...
> > > With that equipement, I could do many tests without fear to brik the
> >
> > machine....
> > > History is, since 2012 I'm using an allmost identical machine to run
> >
> > LinuxCNC. I have been unable to find any other with a so low jitter < 20
> > usec (excellent for stepper pulse generation). Even current systems give me
> > more jitter. Then this second machine came to me. Only differences are in
> > the case: hard disk placement and frontal USB ports vs USB multicard
> > reader. OS is exactly the same, only BIOS version differs. However, jitter
> > in this second machine is 3-4x worse. That's the reason why I think a BIOS
> > update is in order.
> > > Again, thank you very much
> > >
> > > Kind regards from Spain
> > >
> > > Roman