# Gigabyte GA-H61M-S2PV

This page describes how to run coreboot on the Gigabyte GA-H61M-S2PV desktop from Gigabyte.

## Flashing coreboot

Type | Value
--- | ---
Socketed flash | No
Model | MX25L3206E
Size | 4 MiB
In circuit flashing | No
Package | SOIC-8
Write protection | No
Dual BIOS feature | Yes
Internal flashing | Yes

### Internal programming

The main SPI flash can be accessed using flashrom. The DualBIOS backup flash chip is accessible as well using the `dualbiosindex` programmer parameter. Since the flash recovery mechanism works even with coreboot installed on the main flash chip (it still restores the vendor UEFI though), it is useful to leave the backup chip untouched.

### Notes about the original firmware

The original IFD defines the BIOS region as the whole flash chip. While this is not an issue if flashing a complete image, it confuses flashrom and trashes the flash chip’s contents when using the `--ifd` option. A possible workaround is to create a `layout.txt` file with a non-overlapping BIOS region:

    00000000:00000fff fd
    00180000:003fffff bios
    00001000:0017ffff me

After that, use flashrom with the new layout file. For example, to create a backup of the BIOS region and then flash a `coreboot.rom`, do:

    sudo flashrom -p internal -l layout.txt -i bios -r backup.rom
    sudo flashrom -p internal -l layout.txt -i bios -w coreboot.rom

Modifying the IFD so that the BIOS region does not overlap would work as well. However, this makes DualBIOS unable to recover from a bad flash for some reason.

## Technology

Northbridge | Intel Sandy Bridge-specific documentation
Southbridge | bd82x6x
CPU | model_206ax
SuperIO | ITE IT8728F
EC | None
Coprocessor | Intel ME