Add openbmc-conversion.md to document switching from AMI

Change-Id: I40777dfcdb770809cf1032ce6081771d21857cd2
Signed-off-by: Andrew Jeffery <[email protected]>

Author: amboar

openbmc-conversion.md

@@ -0,0 +1,16 @@
+# Converting to OpenBMC from AMI firmware #
+
+Often a number of steps are required to convert from the AMI firmware to
+OpenBMC. These steps are documented for various machines below.
+
+## Palmetto ##
+
+1. Upgrade the firmware flash chip to 256Mb (32MB) part (MX25L25635E or equivalent)
+2. [Build](cheatsheet.md#building-for-palmetto) and flash the `image-bmc`
+   output to the 256Mb flash chip
+3. Replace existing flash chip on the motherboard (cradle closest to the battery)
+4. Manufacture a cable to connect to the COM2 header for the BMC console. COM2
+   is wired for a DB-9-style pin-out.
+5. Reconfigure both `BMC_DEBUG1` (TX) and `BMC_DEBUG2` (RX) jumpers to short
+   pins 2-3.
+6. Boot OpenBMC on your Palmetto. The console runs at 115200baud.