User:GNUtoo

I've no code in flashrom yet, but I made a flashrom compatible arduino programmer and participated in testing and documentation.

With regard to testing I've the following programmers:

(old) M4A785T-M with W25x80 DIP8(with and without coreboot) => works fine
(old) X60 with coreboot and MX25L1605 => works fine
(old) T60 with coreboot and MX25L1605 => works fine
Arduino uno and duemillanove (serprog based) => 5v only, which is problematic
openmoko debug board (FTDI based) => worked fine until broken in lastest svn at the time of writing,also had speed issues with some chips...
(really old) 3com Nic => works fine
some (really really old) reaktek cards but without chip on them.
linux_spi compatible hardwre... => works fine too so far...
~~An atahpt that doesn't work when adding its PCI IDs(but atahpt are known not to work according to the mailing list)~~
~~A very old AGP Nvidia card => works with a patch~~
A recent geforce 210 that didn't work when adding the PCI IDs

I've also the following hardware:

pomona clip for recovering my x60
some chips(2MB SO8(currently soldered), 16MB SO8)

Work in progress for the wiki

Don't try that, it's dangerous!!!!

Howto(Dangerous, not ready for the wiki)

Howto flash sgabios on an Nvidia video card

Use case

Servers often lack a screen.
Some blind people also lack a way to see the startup of the computer until the braille tablet is running.

This Howto will help you transform your Nvidia video card in a something that send to a serial port what would have been displayed on the screen. The card will probably stop working as a graphic card due to the lack of VGA option rom tailored to the card.

The user is expected to see the output trough a serial console.

Howto

Here's an example on how to flash sgabios on an Nvidia video card:

download flashrom
apply that patch:

diff --git a/gfxnvidia.c b/gfxnvidia.c
index d0a9feb..35e4687 100644
--- a/gfxnvidia.c
+++ b/gfxnvidia.c
@@ -110,7 +110,7 @@ int gfxnvidia_init(void)
        rpci_write_long(dev, 0x50, reg32);
 
        /* Write/erase doesn't work. */
-       programmer_may_write = 0;
+       //programmer_may_write = 0;
        register_par_programmer(&par_programmer_gfxnvidia, BUS_PARALLEL);
 
        return 0;

compile it
download and build sgabios
Identify your flash chip size by running:

flashrom -pgfxnvidia

save the content of the chip with:

flashrom -pgfxnvidia -r original.rom

pad sgabios to the size of your flashchip:

dd if=/dev/zero of=sgabios.rom bs=1 count=65536
dd if=10b79200.rom of=sgabios.rom conv=notrunc

flash it(and retry in case of failure, it has a high failure rate)

Howto flash ipxe on an 3com network card

Clone ipxe:

$ git clone git://git.ipxe.org/ipxe.git

Then locate your network card with:

# lspci -nnnn

it will look like that:

[...]
00:0c.0 Ethernet controller [0200]: 3Com Corporation 3c905C-TX/TX-M [Tornado] [10b7:9200] (rev 78)
[...]

Note the pci ids that are here: [10b7:9200]

Ajust your settings in src/config/local/

Then build ipxe:

cd ipxe/src/
make bin/10b79200.rom

Then backup the existing rom:

cd ../../
flashrom -pnic3com -r 3com_rom_backup.rom

The flashchip size is written in the output of that command.

Then generate a rom that is exactly the size of your rom chip:

dd if=/dev/zero of=bin/10b79200.rom.64k bs=1 count=65536
dd if=bin/10b79200.rom of=bin/10b79200.rom.64k conv=notrunc