This adds two small tools useful only on the Freescale/NXP i.MX23/28
devices, so it is bound to the mxs target:
- sdimage: helper to write the required header for the bootstream,
e.g. during bootloader update
- ufb: can be used in conjunction with NXP's host side mfgtool
Signed-off-by: Michael Heimpold <mhei@heimpold.de>