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>

1 files changed, 15 insertions, 0 deletions

diff --git a/Documentation/mainboard/lenovo/t430.md b/Documentation/mainboard/lenovo/t430.md
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+# Lenovo T430
+
+## Flashing instructions
+You have to disassemble the whole device, as the flash ICs are on the bottom
+of the mainboard.
+
+For more details have a look at [T430 / T530 / X230 / T430s / W530 common] and
+```eval_rst
+:doc:`../../flash_tutorial/ext_power`
+```
+
+Steps to access the flash IC are described here [T4xx series].
+
+[T4xx series]: t4xx_series.md
+[T430 / T530 / X230 / T430s / W530 common]: xx30_series.md