[flashrom] [PATCH] Add -p gfxnvidia for flashing NVIDIA graphics cards

[Uwe Hermann]

See patch.

Please do NOT try write/erase on any important cards yet, it doesn't
seem to fully work properly yet and you could "brick" your card.

I tested a "RIVA TNT2 Model 64/Model 64 Pro", which successfully
identified and read a Winbond W29C011 chip, but erase and write behaved
incorrect and I finally bricked the card.

Will look into recovery soon (likely will work via software I assume,
no hardware hacking strictly required I think/hope, we'll see).

As for the list of supported cards: I have no idea which of those may
work (i.e. have the same flash programming interface), maybe none, maybe
all of them (and lots more NVIDIA cards), we'll see as soon as others
test more cards.

Uwe.