target: add configuration for NXP MC-IMX8M-EVK

includes target configuration for i.MX8M SoC family,
board file needs to set up CHIPNAME and CHIPCORES
to match the actual hardware configuration

Change-Id: Ieb6d89cab2477a58f85d0ef9cd242710950191c0
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4434
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

tcl/board/nxp_mcimx8m-evk.cfg

@@ -0,0 +1,22 @@
+#
+# configuration file for NXP MC-IMX8M-EVK
+#
+
+# only JTAG supported
+transport select jtag
+
+# set a safe JTAG clock speed, can be overridden
+adapter_khz 1000
+
+# default JTAG configuration has only SRST and no TRST
+reset_config srst_only srst_push_pull
+
+# delay after SRST goes inactive
+adapter_nsrst_delay 70
+
+# board has an i.MX8MQ with 4 Cortex-A53 cores
+set CHIPNAME imx8mq
+set CHIPCORES 4
+
+# source SoC configuration
+source [find target/imx8m.cfg]

tcl/target/imx8m.cfg

@@ -0,0 +1,55 @@
+#
+# configuration file for NXP i.MX8M family of SoCs
+#
+if { [info exists CHIPNAME] } {
+   set  _CHIPNAME $CHIPNAME
+} else {
+   set  _CHIPNAME imx8m
+}
+
+if { [info exists CHIPCORES] } {
+    set _cores $CHIPCORES
+} else {
+    set _cores 1
+}
+
+# CoreSight Debug Access Port
+if { [info exists DAP_TAPID] } {
+        set _DAP_TAPID $DAP_TAPID
+} else {
+        set _DAP_TAPID 0x5ba00477
+}
+
+# the DAP tap
+jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x01 -irmask 0x0f \
+        -expected-id $_DAP_TAPID
+
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+set _TARGETNAME $_CHIPNAME.a53
+set _CTINAME $_CHIPNAME.cti
+
+set DBGBASE {0x80410000 0x80510000 0x80610000 0x80710000}
+set CTIBASE {0x80420000 0x80520000 0x80620000 0x80720000}
+
+for { set _core 0 } { $_core < $_cores } { incr _core } {
+
+    cti create $_CTINAME.$_core -dap $_CHIPNAME.dap -ap-num 1 \
+        -ctibase [lindex $CTIBASE $_core]
+
+    set _command "target create $_TARGETNAME.$_core aarch64 -dap $_CHIPNAME.dap \
+        -dbgbase [lindex $DBGBASE $_core] -cti $_CTINAME.$_core"
+
+    if { $_core != 0 } {
+        # non-boot core examination may fail
+        set _command "$_command -defer-examine"
+        set _smp_command "$_smp_command $_TARGETNAME.$_core"
+    } else {
+        set _smp_command "target smp $_TARGETNAME.$_core"
+    }
+
+    eval $_command
+}
+
+eval $_smp_command
+targets $_TARGETNAME.0