15d8405584
* Add basic flashing tutorial ** Describe internal and external flashing ** Describe flash supply diode protection ** Gives general advices on flashing ** Describe how to use flashrom --ifd * Describe basic flashing on Lenovo T4xx devices ** Describe how to disassemble and access the flash IC on T4xx ** Describe flash layout on Sandy Bridge and Ivy Bridge series. Change-Id: Ia833e27f4e7d89ee32be9bed21a0c021839facec Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/27852 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
1.7 KiB
1.7 KiB
Lenovo Sandy Bridge series
Flashing coreboot
+---------------------+--------------------+
| Type | Value |
+=====================+====================+
| Socketed flash | no |
+---------------------+--------------------+
| Size | 8 MiB |
+---------------------+--------------------+
| In circuit flashing | Yes |
+---------------------+--------------------+
| Package | SOIC-8 |
+---------------------+--------------------+
| Write protection | No |
+---------------------+--------------------+
| Dual BIOS feature | No |
+---------------------+--------------------+
| Internal flashing | Yes |
+---------------------+--------------------+
Installation instructions
- Update the EC firmware, as there's no support for EC updates in coreboot.
- Do NOT accidently swap pins or power on the board while a SPI flasher is connected. It will destroy your device.
- It's recommended to only flash the BIOS region. In that case you don't need to extract BLOBs from vendor firmware. If you want to flash the whole chip, you need BLOBs when building coreboot.
- The shipped Flash layout allocates 3MiB to the BIOS region, which is the space usable by coreboot.
- ROM chip size should be set to 8MiB.
Please also have a look at :doc:`../../flash_tutorial/index`.
Flash layout
There's one 8MiB flash which contains IFD, GBE, ME and BIOS regions. On Lenovo's UEFI the EC firmware update is placed at the start of the BIOS region. The update is then written into the EC once.
