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, 55 insertions, 0 deletions

diff --git a/Documentation/flash_tutorial/flash_ic_no_diode.svg b/Documentation/flash_tutorial/flash_ic_no_diode.svg
new file mode 100644
index 0000000000..543c9262df
--- /dev/null
+++ b/Documentation/flash_tutorial/flash_ic_no_diode.svg
@@ -0,0 +1,55 @@
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