This page describes how to run coreboot on the Gigabyte GA-H61M-S2PV desktop from Gigabyte.
+---------------------+------------+ | 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 | +---------------------+------------+
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.
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.
+------------------+--------------------------------------------------+ | Northbridge | :doc:`../../northbridge/intel/sandybridge/index` | +------------------+--------------------------------------------------+ | Southbridge | bd82x6x | +------------------+--------------------------------------------------+ | CPU | model_206ax | +------------------+--------------------------------------------------+ | SuperIO | ITE IT8728F | +------------------+--------------------------------------------------+ | EC | None | +------------------+--------------------------------------------------+ | Coprocessor | Intel ME | +------------------+--------------------------------------------------+