mpc83xx: Add support for the MPC8349E-mITX-GP

Add support for the MPC8349E-mITX-GP, a stripped-down version of the
MPC8349E-mITX.  Bonus features include support for low-boot (BMS bit in
HRCW is 0) for the ITX and a README for the ITX and the ITX-GP.

Signed-off-by: Timur Tabi <timur@freescale.com>
diff --git a/board/mpc8349itx/config.mk b/board/mpc8349itx/config.mk
index 2e11311..1901fdc 100644
--- a/board/mpc8349itx/config.mk
+++ b/board/mpc8349itx/config.mk
@@ -21,10 +21,14 @@
 #
 
 #
-# MPC8349ITX
+# MPC8349E-mITX and MPC8349E-mITX-GP
 #
 
+sinclude $(OBJTREE)/board/$(BOARDDIR)/config.tmp
+
+ifndef TEXT_BASE
 TEXT_BASE  =   0xFEF00000
+endif
 
 ifneq ($(OBJTREE),$(SRCTREE))
 # We are building u-boot in a separate directory, use generated