cfg: add initial Atmel xplained kit support

These kits feature a CMSIS-DAP compliant debugger and so have been added
as part of the pending support.

Currently the flash drivers for the L8 and D20 are wip.

One issue this implementation of CMSIS-DAP raised is that it supports
512byte HID reports, however using the current HIDAPI we have no cross platform
way of querying this info. Long term we plan to add this support to HIDAPI.

Change-Id: Ie8b7c871f58a099d963cd71a9f8a0105a38784e9
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/1625
Tested-by: jenkins

1 files changed, 61 insertions, 0 deletions

diff --git a/tcl/target/at91samdXX.cfg b/tcl/target/at91samdXX.cfg
new file mode 100644
index 00000000..0a1ef26c
--- /dev/null
+++ b/tcl/target/at91samdXX.cfg
@@ -0,0 +1,61 @@
+#
+# script for ATMEL samdXX, a CORTEX-M0 chip
+#
+
+#
+# samdXX devices only support SWD transports.
+#
+source [find target/swj-dp.tcl]
+
+if { [info exists CHIPNAME] } {
+   set _CHIPNAME $CHIPNAME
+} else {
+   set _CHIPNAME at91samd
+}
+
+if { [info exists ENDIAN] } {
+   set _ENDIAN $ENDIAN
+} else {
+   set _ENDIAN little
+}
+
+# Work-area is a space in RAM used for flash programming
+# By default use 2kB
+if { [info exists WORKAREASIZE] } {
+   set _WORKAREASIZE $WORKAREASIZE
+} else {
+   set _WORKAREASIZE 0x800
+}
+
+if { [info exists CPUTAPID] } {
+   set _CPUTAPID $CPUTAPID
+} else {
+   set _CPUTAPID 0x4ba00477
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -expected-id $_CPUTAPID
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -chain-position $_TARGETNAME
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+$_TARGETNAME configure -event gdb-flash-erase-start {
+    halt
+}
+
+# JTAG speed should be <= F_CPU/6. F_CPU after reset is 4 MHz, so use F_JTAG = 0.5MHz
+#
+# Since we may be running of an RC oscilator, we crank down the speed a
+# bit more to be on the safe side. Perhaps superstition, but if are
+# running off a crystal, we can run closer to the limit. Note
+# that there can be a pretty wide band where things are more or less stable.
+
+adapter_khz 500
+adapter_nsrst_delay 100
+
+# if srst is not fitted use SYSRESETREQ to
+# perform a soft reset
+cortex_m reset_config sysresetreq
+
+# no flash defined yet