[flashrom] Re: Support for M50FLW080A

[Paul Kocialkowski]

Hi,

On Wed 19 Apr 23, 20:51, Javier Bizcocho wrote:
> Hello Paul,
>
> Thank you very much for the advice, I'll have a look at how to enable this
> "board enable code".
>
> Perhaps I can have look at the code of other chips of similar "LPC/FWH"
> types (some Winbond?).

Well the board enable part is typically not very related to which flash chip
is used but instead has to do with how the flash chip is wired on the
mainboard.

You can find examples of enable code for support boards at:
https://review.coreboot.org/plugins/gitiles/flashrom/+/refs/heads/master/boa...

If you have access to the schematics of your board, that will make it easier.
Otherwise you can try to look for supported boards with the same chipset as
yours, use that as a base and do some trial/error to find out how to disable
write protection for your board specifically.

Cheers,

Paul
> Regards,
>
> Javi.
>
> On 19/04/2023 09:14, Paul Kocialkowski wrote:
> > Hi Javier,
> >
> > On Wed 19 Apr 23, 01:32, Javier Bizcocho wrote:
> > > Hello guys,
> > >
> > > Just a soft bump.
> > >
> > > No one has any comment about this? :).
> >
> > So if what you're trying to do is to flash from the live system running on
> > said motherboard, you probably need some kind of board enable code to allow
> > write/erase access. Seehttps://www.flashrom.org/Board_Enable
> >
> > This can be as trivial as toggling a GPIO, but the less trivial part is usually
> > to find out which GPIO that is.
> >
> > Quoting the datasheet for the chip about security:
> > – Hardware Write Protect pins for block protection
> > – Register-based Read and Write Protection
> > – Individual Lock Register for each 4 KByte sector
> >
> > So you might want to take a look at the status of the two latter points as well.
> >
> > Cheers,
> >
> > Paul
> > > Kind Regards,
> > >
> > > Javi.
> > >
> > > On 17/04/2023 14:34, Javier Bizcocho wrote:
> > > > Hello guys,
> > > >
> > > > I'm trying to flash a modded bios on my motherboard. The computer is a
> > > > Dell SC1435 and the flash chip in question "M50FLW080A" is supported by
> > > > the tool already, but just partially.
> > > >
> > > > It looks like it can read the bios, but when reading or erasing it
> > > > always fails (and every now and then it even forces my PC to reboot). My
> > > > server is running FreeBSD 13.1, but I've also tried with Ubuntu (same
> > > > result). Even though it fails to erase / write the chip was never
> > > > altered at all, so I wonder if there is any kind of protection on it.
> > > >
> > > > Is there any logs that I can extract from the tool itself? I'd like to
> > > > avoid the need to de-soldering the chip in order to flash it :).
> > > >
> > > > Any thoughts?
> > > >
> > > > Thank you in advance,
> > > >
> > > > Javi.
> > >
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