Add cheatsheet
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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+
+# OpenBMC cheatsheet
+
+This document is intended to provide a set of recipes for common OpenBMC
+customisation tasks, without having to know the full yocto build process.
+
+## Using a local kernel build
+
+The kernel recipe is in:
+
+```
+ meta-phosphor/common/recipes-kernel/linux/linux-obmc_4.2.bb
+```
+
+To use a local git tree, change the `SRC_URI` to a git:// URL without
+a hostname. For example:
+
+```
+SRC_URI = "git:///home/jk/devel/linux;protocol=git;branch=${KBRANCH}"
+```
+
+The `SRCREV` variable can be used to set an explicit git commit. The
+default (`${AUTOREV}`) will use the latest commit in `KBRANCH`.
+
+