81 lines
3.1 KiB
Markdown
81 lines
3.1 KiB
Markdown
# 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 | No |
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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. A possible workaround is
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to create a `layout.txt` file with a non-overlapping BIOS region:
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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, use flashrom with the new layout file. For example, to create a
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backup of the BIOS region and then flash a `coreboot.rom`, do:
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```bash
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sudo flashrom -p internal -l layout.txt -i bios -r backup.rom
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sudo flashrom -p internal -l layout.txt -i bios -w coreboot.rom
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```
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Modifying the IFD so that the BIOS region does not overlap would work as well.
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However, this makes DualBIOS unable to recover from a bad flash for some reason.
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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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