GNUBoot/coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
coreboot-kgpe-d16/Documentation/flash_tutorial/ext_standalone.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

884 B
Raw Blame History

Flashing firmware standalone

If none of the other methods work, there are three possibilities:

Desolder

You must remove or desolder the flash IC before you can flash it. It's recommended to solder a socket in place of the flash IC.

When flashing the IC, always connect all input pins. If in doubt, pull /WP, /HOLD, /RESET and alike up towards Vcc.

SPI flash emulator

If you are a developer, you might want to use an EM100Pro instead, which sets the onboard flash on hold, and allows to run custom firmware. It provides a very fast development cycle without actually writing to flash.

SPI flash overwrite

It is possible to set the onboard flash on hold and use another flash chip. Connect all lines one-to-one, except /HOLD. Pull /HOLD of the soldered flash IC low, and /HOLD of your replacement flash IC high.