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Documentation/mainboard/gigabyte/ga-h61m-s2pv: Expand page 

Uniformize the Yes/No in the tables, expand the internal programming
section and explain how to patch a defective flash descriptor.

Change-Id: I972bb8948c29ce0eba46daa92ce6b6052db7b063
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/28833
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Angel Pons 2018-09-30 22:42:52 +02:00 committed by Nico Huber
parent 645064a59e
commit 3b6bddafe7
1 changed files with 35 additions and 5 deletions
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40
Documentation/mainboard/gigabyte/ga-h61m-s2pv.md
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@ -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 |
+------------------+--------------------------------------------------+