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-rw-r--r--Documentation/mainboard/gigabyte/ga-h61m-s2pv.md40
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 |
+------------------+--------------------------------------------------+