lpc7168: make flash available upon reset init

set user mode to avoid ROM being mapped at address
0 rather than flash.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

tcl/target/lpc1768.cfg

@@ -52,3 +52,22 @@ flash bank $_FLASHNAME lpc2000 0x0 0x80000 0 0 $_TARGETNAME \
 # a reset-init handler) speeds it up.
 jtag_rclk [ expr 4000 / 6 ]
 $_TARGETNAME configure -event reset-start { jtag_rclk [ expr 4000 / 6]  }
+
+
+$_TARGETNAME configure -event reset-init {
+	# Do not remap 0x0000-0x0020 to anything but the flash (i.e. select
+	# "User Flash Mode" where interrupt vectors are _not_ remapped,
+	# and reside in flash instead).
+	#
+	# See Table 612. Memory Mapping Control register (MEMMAP - 0x400F C040) bit description
+	# Bit Symbol Value Description Reset
+	# value
+	# 0 MAP Memory map control. 0
+	# 0 Boot mode. A portion of the Boot ROM is mapped to address 0.
+	# 1 User mode. The on-chip Flash memory is mapped to address 0.
+	# 31:1 - Reserved. The value read from a reserved bit is not defined. NA
+	#
+	# http://ics.nxp.com/support/documents/microcontrollers/?scope=LPC1768&type=user
+
+	mww 0x400FC040 0x01
+}