Difference between revisions of "User:GNUtoo"

Revision as of 20:27, 4 May 2013

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
• 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(I didn't test it yet)
• 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!!!!

Examples

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

TODO