Re: Mac Pro Mojave with AMD RX580 need to fix ROM for boot screen.

[Mike Banon]

Dear Ray,

Sorry, but I am quite sure that you will not be able to successfully
flash a memory chip of your video card using the flashrom's Internal
flashing mode, especially on a Mac: even the internal flashing of its'
own BIOS chip is likely not supported (if a chipset isn't) and could
result in a (software) bricking. So, most likely you'll have to use
the external flashing adapter, like USB CH341A, which hopefully could
be connected to a memory chip of your video card using a test clip (to
avoid the soldering). Then, the command line will look like

sudo ./flashrom -p ch341a_spi -r dump.bin -V

And you could find an example of flashing setup here:
http://dangerousprototypes.com/docs/Flashing_a_BIOS_chip_with_Bus_Pirate#CH3...

I am sending a copy of this e-mail to a flashrom mailing list, just in
case someone would see a mistake in my message and would like to
clarify or add some useful info.

Best regards,
Mike

On Thu, Sep 5, 2019 at 10:39 PM Ray Nygren  wrote:
> Sorry for the misunderstanding.
> I have flashrom install on mac pro correctly.
> I am not flahing mac pro rom its the AMD RX580 Video card which has a mistake in the ROM bios that
> need updated to make it compatable with Mac as the pre graphics screen is blank
> I attached the link in the reques you replied to on the fix
> My question to forum is:
> what is the arg to dump list of roms seen.
> need to identify and dump rom from RX580 video card
> edit 5 bytes and flash video card rom
>
> If you are not able to help please forward to anyone who can assist me.
> Thanks
>
> Sent: Monday, September 02, 2019 at 6:26 AM
> From: "Mike Banon" 
> To: [e-mail], flashrom 
> Subject: Re: [flashrom] Mac Pro Mojave with AMD RX580 need to fix ROM for boot screen.
> Are you trying the internal flashing mode? If a Mac Pro chipset is not
> supported by a flashrom, it wouldn't be successful.
> You might need the external flashing: get a hardware programmer like
> CH341A, find a ROM chip at RX 580 motherboard,
> try to connect CH341A to a chip using some test clip which is
> compatible with a chip (make sure this chip supports 3.3V
> since there are some flash chips that are 1.8V), and try. This is how
> I would have tried to do it.
>
> On Fri, Aug 30, 2019 at 9:45 PM  wrote:
> > I found a link to correct the problem that many people have but no one has completed with flashrom on Mac they e 580 from Mac Pro then insert to PC to use flash program,
> > I would like to try to do all on MAC usin flash rom. I was able to complete install brew then flashrom but now am overwelmened by manual
> > here is the link with fix
> > https://forums.macrumors.com/threads/turn-a-new-sapphire-rx580-pulse-into-th...
> >
> > I need arguments to dump rx580 ROM to file
> > copy to backup
> > edit changes
> > save file
> > flash rx580 card
> >
> > What args should I use to dump to file and then flash
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