Usage: Difference between revisions

Revision as of 15:06, 4 May 2013

Usage scenarios

Boot firmware(BIOS/coreboot)

Option roms

Flashrom can be used to flash option roms such as ipxe or sgabios, they can respectively be flashed on network card and graphic card, but it's not mandatory: you can use any card as a carrier as long as the card is supported by flashrom and that the BIOS runs its option rom.

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

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

@@ Line 24: / Line 24: @@
           return 0;
 * compile it
+* download and build sgabios
+* Identify your flash chip size by running:
+ flashrom -pgfxnvidia
+* 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