topic: Add support for i.MX28EVK

Added the file imx28.cfg to the target directory
Added the file imx28evk.cfg to the board directory

Change-Id: I02a74a03f3773892f830d13660ffdded34f3261d
Signed-off-by: James Robinson <jmr13031@gmail.com>
Reviewed-on: http://openocd.zylin.com/428
Tested-by: jenkins
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

tcl/target/imx28.cfg

@@ -0,0 +1,38 @@
+# i.MX28 config file.
+# based off of the imx21.cfg file.
+
+reset_config trst_and_srst
+
+#jtag nTRST and nSRST delay
+adapter_nsrst_delay 100
+jtag_ntrst_delay 100
+
+if { [info exists CHIPNAME] } {
+   set  _CHIPNAME $CHIPNAME
+} else {
+   set  _CHIPNAME imx28
+}
+
+if { [info exists ENDIAN] } {
+   set  _ENDIAN $ENDIAN
+} else {
+   set  _ENDIAN little
+}
+
+
+# Note above there is 1 tap
+
+# The CPU tap
+if { [info exists CPUTAPID ] } {
+   set _CPUTAPID $CPUTAPID
+} else {
+   set _CPUTAPID 0x079264f3
+}
+jtag newtap $_CHIPNAME cpu  -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+
+
+# Create the GDB Target.
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME arm926ejs -endian $_ENDIAN -chain-position $_TARGETNAME -variant arm926ejs
+
+arm7_9 dcc_downloads enable