config files: Drop incorrect comments.

[fw/openocd] / tcl / target / pxa255.cfg

diff --git a/tcl/target/pxa255.cfg b/tcl/target/pxa255.cfg
index 93d27bd363378bd57eceaeba6f358a6cde4233be..5b745f8599f752300bba9b1e19902e996ce26079 100644 (file)
--- a/tcl/target/pxa255.cfg
+++ b/tcl/target/pxa255.cfg
@@ -1,15 +1,15 @@
 # PXA255 chip ... originally from Intel, PXA line was sold to Marvell.
 #  This chip is now at end-of-life.  Final orders have been taken.
 
-if { [info exists CHIPNAME] } {        
-   set  _CHIPNAME $CHIPNAME    
-} else {        
+if { [info exists CHIPNAME] } {
+   set  _CHIPNAME $CHIPNAME
+} else {
    set  _CHIPNAME pxa255
 }
 
-if { [info exists ENDIAN] } {  
-   set  _ENDIAN $ENDIAN    
-} else {        
+if { [info exists ENDIAN] } {
+   set  _ENDIAN $ENDIAN
+} else {
    set  _ENDIAN little
 }
 
@@ -19,8 +19,41 @@ if { [info exists CPUTAPID ] } {
    set _CPUTAPID 0x69264013
 }
 
-jtag newtap $_CHIPNAME cpu -irlen 5 -ircapture 0x1e -irmask 0x1f -expected-id $_CPUTAPID
+jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id $_CPUTAPID
 
 set _TARGETNAME $_CHIPNAME.cpu
-target create $_TARGETNAME xscale -endian $_ENDIAN -chain-position $_TARGETNAME
-debug_level 3
+target create $_TARGETNAME xscale -endian $_ENDIAN \
+       -chain-position $_CHIPNAME.cpu
+
+# PXA255 comes out of reset using 3.6864 MHz oscillator.
+# Until the PLL kicks in, keep the JTAG clock slow enough
+# that we get no errors.
+adapter_khz 300
+$_TARGETNAME configure -event "reset-start" { adapter_khz 300 }
+
+# both TRST and SRST are *required* for debug
+# DCSR is often accessed with SRST active
+reset_config trst_and_srst separate srst_nogate
+
+# reset processing that works with PXA
+proc init_reset {mode} {
+       # assert both resets; equivalent to power-on reset
+       jtag_reset 1 1
+
+       # drop TRST after at least 32 cycles
+       sleep 1
+       jtag_reset 0 1
+
+       # minimum 32 TCK cycles to wake up the controller
+       runtest 50
+
+       # now the TAP will be responsive; validate scanchain
+       jtag arp_init
+
+       # ... and take it out of reset
+       jtag_reset 0 0
+}
+
+proc jtag_init {} {
+       init_reset startup
+}