README: Add instructions for chain-loading U-Boot

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Most Chromebooks support chain-loading U-Boot but instructions are
somewhat scattered. Add a README to hold this information within the
U-Boot tree. Also add the standard developer keys to simplify the
instructions, since they are small.

For now this only supports nyan-big.

Signed-off-by: Simon Glass <sjg@chromium.org>

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Simon Glass

2017-05-31 17:57:24 -06:00

parent 13bdce8f8c

commit c9af6673e8

3 changed files with 182 additions and 0 deletions

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