target/imx6ul: Initial support

Unlike the rest of imx6 the 6UL 6ULL 6ULZ chips are based on Cortex-A7
which is at a different address so a custom script is required.

Tested on imx6ull-14x14-evk

Change-Id: I72822d2241045c318389fadbc66d7aaabaaf4cb5
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-on: http://openocd.zylin.com/5040
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

tcl/target/imx6ul.cfg

@@ -0,0 +1,50 @@
+#
+# Freescale i.MX6UltraLite series: 6UL 6ULL 6ULZ
+#
+
+if { [info exists CHIPNAME] } {
+    set _CHIPNAME $CHIPNAME
+} else {
+    set _CHIPNAME imx6ul
+}
+
+# CoreSight Debug Access Port
+if { [info exists DAP_TAPID] } {
+    set _DAP_TAPID $DAP_TAPID
+} else {
+    set _DAP_TAPID 0x4ba00477
+}
+
+jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x01 -irmask 0x0f \
+        -expected-id $_DAP_TAPID
+
+# SDMA / no IDCODE
+jtag newtap $_CHIPNAME sdma -irlen 4 -ircapture 0x00 -irmask 0x0f
+
+# System JTAG Controller
+set _SJC_TAPID_6UL  0x0891d01d
+set _SJC_TAPID_6ULL 0x0891e01d
+set _SJC_TAPID_6ULZ 0x1891e01d
+
+# Allow external override of the first SJC TAPID
+if { [info exists SJC_TAPID] } {
+    set _SJC_TAPID $SJC_TAPID
+} else {
+    set _SJC_TAPID $_SJC_TAPID_6UL
+}
+
+jtag newtap $_CHIPNAME sjc -irlen 5 -ircapture 0x01 -irmask 0x1f \
+        -ignore-version \
+        -expected-id $_SJC_TAPID \
+        -expected-id $_SJC_TAPID_6ULL \
+        -expected-id $_SJC_TAPID_6ULZ \
+
+# Create DAP
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+# Main AHB bus
+target create $_CHIPNAME.ahb mem_ap -dap $_CHIPNAME.dap -ap-num 0
+
+# Cortex-A7 single core
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_a -dap $_CHIPNAME.dap -dbgbase 0x82130000