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coreboot-kgpe-d16/Documentation/flash_tutorial/int_flashrom.md
Patrick Rudolph 15d8405584 Documentation: Add basic flashing tutorial for Lenovo 
* 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>
2018-09-30 03:20:36 +00:00

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Flashing firmware internally

WARNING: If you flash a broken firmware and have no recovery mechanism, you must use the external method to flash a working firmware again.

Using flashrom

This method does only work on Linux, if it isn't locked down. You may also need to boot with 'iomem=relaxed' in the kernel command line if CONFIG_IO_STRICT_DEVMEM is set.

For more details please also check flashrom's wiki. Use the programmer internal to flash coreboot.rom internally:

flashrom -p internal -w coreboot.rom