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| author | Patrick Rudolph <siro@das-labor.org> | 2018-08-04 10:04:45 +0200 |
|---|---|---|
| committer | Philipp Deppenwiese <zaolin.daisuki@gmail.com> | 2018-09-30 03:20:36 +0000 |
| commit | 15d840558480536ddaca71bc1876254d59fca7fe (patch) | |
| tree | ecbb8b330e53b9413eaf17a72e0fb79a9ed2523f /Documentation/flash_tutorial/ext_standalone.md | |
| parent | 3d1d966dd8866e8fd399f988b38b7ceba9f4cfee (diff) | |
| download | coreboot-15d840558480536ddaca71bc1876254d59fca7fe.tar.xz | |
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>
Diffstat (limited to 'Documentation/flash_tutorial/ext_standalone.md')
| -rw-r--r-- | Documentation/flash_tutorial/ext_standalone.md | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/flash_tutorial/ext_standalone.md b/Documentation/flash_tutorial/ext_standalone.md new file mode 100644 index 0000000000..3a676ce47c --- /dev/null +++ b/Documentation/flash_tutorial/ext_standalone.md @@ -0,0 +1,23 @@ +# 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. + + +[EM100Pro]: https://www.dediprog.com/product/EM100Pro |