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| -rw-r--r-- | Documentation/mainboard/gigabyte/ga-h61m-s2pv.md | 40 |
1 files changed, 35 insertions, 5 deletions
diff --git a/Documentation/mainboard/gigabyte/ga-h61m-s2pv.md b/Documentation/mainboard/gigabyte/ga-h61m-s2pv.md index 54c647eef5..06c0ff7e89 100644 --- a/Documentation/mainboard/gigabyte/ga-h61m-s2pv.md +++ b/Documentation/mainboard/gigabyte/ga-h61m-s2pv.md @@ -9,13 +9,13 @@ from [Gigabyte]. +---------------------+------------+ | Type | Value | +=====================+============+ -| Socketed flash | no | +| Socketed flash | No | +---------------------+------------+ | Model | MX25L3206E | +---------------------+------------+ | Size | 4 MiB | +---------------------+------------+ -| In circuit flashing | yes | +| In circuit flashing | Yes | +---------------------+------------+ | Package | SOIC-8 | +---------------------+------------+ @@ -23,13 +23,43 @@ from [Gigabyte]. +---------------------+------------+ | Dual BIOS feature | Yes | +---------------------+------------+ -| Internal flashing | yes | +| Internal flashing | Yes | +---------------------+------------+ ``` ### Internal programming -The main SPI flash can be accessed using [flashrom]. +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. However, this can be easily +fixed by reading the IFD with flashrom, editing the correct values into it with +ifdtool and then reflashing it. + +Create a layout.txt with the following contents: + + 00000000:00000fff fd + 00180000:003fffff bios + 00001000:0017ffff me + +After that, simply run: + +```bash +sudo flashrom -p internal --ifd -i fd -r ifd.rom +ifdtool -n layout.txt ifd.rom +sudo flashrom -p internal --ifd -i fd -w ifd.rom.new +``` + +After flashing, power cycle the computer to ensure the new IFD is being used. +If only a reboot is done, the old IFD layout is still seen by flashrom, even if +the IFD on the flash chip is correctly defining the new region layout. ## Technology @@ -43,7 +73,7 @@ The main SPI flash can be accessed using [flashrom]. +------------------+--------------------------------------------------+ | SuperIO | ITE IT8728F | +------------------+--------------------------------------------------+ -| EC | | +| EC | None | +------------------+--------------------------------------------------+ | Coprocessor | Intel ME | +------------------+--------------------------------------------------+ |