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authorHarald Welte <laforge@gnumonks.org>2016-03-30 11:19:16 +0200
committerFreddie Chopin <freddie.chopin@gmail.com>2016-11-04 21:22:32 +0000
commit75c3f4a25c9a1250ecba2eb40dbe1c4f16087184 (patch)
treef2f8d0e391ca1e398021d47b1e49985b01a9e5be
parentd1bdcdcc8d429a2ce06fb35f82a67b2487b72ec3 (diff)
AM335x: Disable watchdog on 'reset halt'
At least on my (phyCORE-AM335X) system, the AM335x watchdog needs to be disabled to use OpenOCD for more than 6.5 seconds after reset. Change-Id: I3d883a9f572b0ccb92f9864853a00c372e39d7f2 Signed-off-by: Harald Welte <laforge@gnumonks.org> Reviewed-on: http://openocd.zylin.com/3391 Tested-by: jenkins Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Paul Fertser <fercerpav@gmail.com>
-rw-r--r--tcl/target/am335x.cfg32
1 files changed, 32 insertions, 0 deletions
diff --git a/tcl/target/am335x.cfg b/tcl/target/am335x.cfg
index 74096151..3ca196b1 100644
--- a/tcl/target/am335x.cfg
+++ b/tcl/target/am335x.cfg
@@ -76,3 +76,35 @@ target create $_TARGETNAME cortex_a -chain-position $_CHIPNAME.dap -dbgbase 0x80
# SRAM: 64K at 0x4030.0000; use the first 16K
$_TARGETNAME configure -work-area-phys 0x40300000 -work-area-size 0x4000
+
+
+# when putting the target into 'reset halt', we need to disable the watchdog as
+# it would otherwise trigger while we're in JTAG
+# FIXME: unify with target/am437x.cfg
+source [find mem_helper.tcl]
+set WDT1_BASE_ADDR 0x44e35000
+set WDT1_W_PEND_WSPR [expr $WDT1_BASE_ADDR + 0x0034]
+set WDT1_WSPR [expr $WDT1_BASE_ADDR + 0x0048]
+proc disable_watchdog { } {
+ global WDT1_WSPR
+ global WDT1_W_PEND_WSPR
+ global _TARGETNAME
+
+ set curstate [$_TARGETNAME curstate]
+
+ if { [string compare $curstate halted] == 0 } {
+ set WDT_DISABLE_SEQ1 0xaaaa
+ set WDT_DISABLE_SEQ2 0x5555
+
+ mww phys $WDT1_WSPR $WDT_DISABLE_SEQ1
+
+ # Empty body to make sure this executes as fast as possible.
+ # We don't want any delays here otherwise romcode might start
+ # executing and end up changing state of certain IPs.
+ while { [expr [mrw $WDT1_W_PEND_WSPR] & 0x10] } { }
+
+ mww phys $WDT1_WSPR $WDT_DISABLE_SEQ2
+ while { [expr [mrw $WDT1_W_PEND_WSPR] & 0x10] } { }
+ }
+}
+$_TARGETNAME configure -event reset-end { disable_watchdog }