Ok I'm going to break my own rule and talk about the Kindle Fire.
It's codename is "banjo" and the CPU is cortex a8 in an imx51 arch. Both "yoshi" (Kindle 4/touch) and "banjo" (fire) have fastboot support I think. Someone try to get fastboot working on their kindle 4 as I don't have one. If you get into fastboot, you can flash partitions.
EDIT: I think this is a dead end. To get fastboot, you need to set a param in uboot which requires a serial console. If i read correctly, only "ECT boards" (dev?) I'd 004 have serial access. Production boards "tequila" (003) skip serial port init, aka even if there is a serial port, it's disabled.
Last edited by yifanlu; 10-05-2011 at 12:24 AM.