pandaboard: use new -dbgbase option to workaround broken ROM table

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

tcl/target/omap4430.cfg

@@ -82,7 +82,20 @@ jtag configure $_CHIPNAME.jrc -event post-reset "runtest 200"
 # second core.
 #
 set _TARGETNAME $_CHIPNAME.cpu
-target create $_TARGETNAME cortex_a8 -chain-position $_CHIPNAME.dap -coreid 0
+
+# APB DBGBASE reads 0x80040000, but this points to an empty ROM table.
+# 0x80000000 is cpu0 coresight region
+#
+#
+# CORTEX_A8_PADDRDBG_CPU_SHIFT 13
+# 0x80000000 | (coreid << CORTEX_A8_PADDRDBG_CPU_SHIFT)
+
+set _coreid 0
+set _dbgbase [expr 0x80000000 | ($_coreid << 13)]
+echo "Using dbgbase = [format 0x%x $_dbgbase]"
+ 
+target create $_TARGETNAME cortex_a8 -chain-position $_CHIPNAME.dap \
+  -coreid 0 -dbgbase $_dbgbase
 
 # SRAM: 56KiB at 0x4030.0000
 $_TARGETNAME configure -work-area-phys 0x40300000 -work-area-size 0x1000