cfg: add basic support of Freescale i.MX6 series targets

This change adds a simple target configuration for Freescale
single/dual/quad core i.MX6 SoCs, only one core is configured by default.

Change-Id: I853dd27f4c6765b7f731be2ddea82e85d496c6a4
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-on: http://openocd.zylin.com/1135
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

tcl/target/imx6.cfg

@@ -0,0 +1,56 @@
+# Freescale i.MX6 series single/dual/quad core processor
+
+if { [info exists CHIPNAME] } {
+   set  _CHIPNAME $CHIPNAME
+} else {
+   set  _CHIPNAME imx6
+}
+
+# CoreSight Debug Access Port
+if { [info exists DAP_TAPID] } {
+        set _DAP_TAPID $DAP_TAPID
+} else {
+        set _DAP_TAPID 0x4ba00477
+}
+
+jtag newtap $_CHIPNAME dap -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
+if { [info exists SJC_TAPID] } {
+        set _SJC_TAPID SJC_TAPID
+} else {
+        set _SJC_TAPID 0x0191c01d
+}
+set _SJC_TAPID2 0x2191c01d
+
+jtag newtap $_CHIPNAME sjc -irlen 5 -ircapture 0x01 -irmask 0x1f \
+        -expected-id $_SJC_TAPID -expected-id $_SJC_TAPID2
+
+# GDB target: Cortex-A9, using DAP, configuring only one core
+# Base addresses of cores:
+# core 0  -  0x82150000
+# core 1  -  0x82152000
+# core 2  -  0x82154000
+# core 3  -  0x82156000
+set _TARGETNAME $_CHIPNAME.cpu.0
+target create $_TARGETNAME cortex_a8 -chain-position $_CHIPNAME.dap \
+        -coreid 0 -dbgbase 0x82150000
+
+# some TCK cycles are required to activate the DEBUG power domain
+jtag configure $_CHIPNAME.sjc -event post-reset "runtest 100"
+
+proc imx6_dbginit {target} {
+        # General Cortex A8/A9 debug initialisation
+        cortex_a8 dbginit
+}
+
+# Slow speed to be sure it will work
+jtag_rclk 1000
+$_TARGETNAME configure -event reset-start { jtag_rclk 1000 }
+
+$_TARGETNAME configure -event reset-assert-post "imx6_dbginit $_TARGETNAME"
+$_TARGETNAME configure -event gdb-attach { halt }