85 lines
3.2 KiB
Markdown
85 lines
3.2 KiB
Markdown
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# Gigabyte GA-H61M-S2PV
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This page describes how to run coreboot on the [Gigabyte GA-H61M-S2PV] desktop
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from [Gigabyte].
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## Flashing coreboot
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```eval_rst
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+---------------------+------------+
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| Type | Value |
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+=====================+============+
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| Socketed flash | No |
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+---------------------+------------+
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| Model | MX25L3206E |
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+---------------------+------------+
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| Size | 4 MiB |
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+---------------------+------------+
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| In circuit flashing | Yes |
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+---------------------+------------+
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| Package | SOIC-8 |
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+---------------------+------------+
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| Write protection | No |
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+---------------------+------------+
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| Dual BIOS feature | Yes |
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+---------------------+------------+
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| Internal flashing | Yes |
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+---------------------+------------+
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```
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### Internal programming
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The main SPI flash can be accessed using [flashrom]. The DualBIOS backup flash
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chip is accessible as well using the `dualbiosindex` programmer parameter.
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Since the flash recovery mechanism works even with coreboot installed on the
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main flash chip (it still restores the vendor UEFI though), it is useful to
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leave the backup chip untouched.
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### Notes about the original firmware
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The original IFD defines the BIOS region as the whole flash chip. While this is
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not an issue if flashing a complete image, it confuses flashrom and trashes the
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flash chip's contents when using the --ifd option. However, this can be easily
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fixed by reading the IFD with flashrom, editing the correct values into it with
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ifdtool and then reflashing it.
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Create a layout.txt with the following contents:
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00000000:00000fff fd
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00180000:003fffff bios
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00001000:0017ffff me
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After that, simply run:
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```bash
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sudo flashrom -p internal --ifd -i fd -r ifd.rom
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ifdtool -n layout.txt ifd.rom
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sudo flashrom -p internal --ifd -i fd -w ifd.rom.new
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```
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After flashing, power cycle the computer to ensure the new IFD is being used.
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If only a reboot is done, the old IFD layout is still seen by flashrom, even if
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the IFD on the flash chip is correctly defining the new region layout.
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## Technology
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```eval_rst
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+------------------+--------------------------------------------------+
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| Northbridge | :doc:`../../northbridge/intel/sandybridge/index` |
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+------------------+--------------------------------------------------+
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| Southbridge | bd82x6x |
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+------------------+--------------------------------------------------+
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| CPU | model_206ax |
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+------------------+--------------------------------------------------+
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| SuperIO | ITE IT8728F |
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+------------------+--------------------------------------------------+
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| EC | None |
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+------------------+--------------------------------------------------+
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| Coprocessor | Intel ME |
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+------------------+--------------------------------------------------+
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```
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[Gigabyte GA-H61M-S2PV]: https://www.gigabyte.com/us/Motherboard/GA-H61M-S2PV-rev-10
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[Gigabyte]: https://www.gigabyte.com
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[flashrom]: https://flashrom.org/Flashrom
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