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-rw-r--r--tcl/target/pic32mx.cfg33
1 files changed, 23 insertions, 10 deletions
diff --git a/tcl/target/pic32mx.cfg b/tcl/target/pic32mx.cfg
index 0f1fa66c..d77c3a8c 100644
--- a/tcl/target/pic32mx.cfg
+++ b/tcl/target/pic32mx.cfg
@@ -18,14 +18,14 @@ if { [info exists CPUTAPID ] } {
set _CPUTAPID 0x30938053
}
-# working area is 16384 - 2048
-# loose first 2048 bytes due to BMXDKPBA reg
+# default working area is 16384
if { [info exists WORKAREASIZE] } {
set _WORKAREASIZE $WORKAREASIZE
} else {
- set _WORKAREASIZE [expr (16384 - 2048)]
+ set _WORKAREASIZE 0x4000
}
+
jtag_nsrst_delay 100
jtag_ntrst_delay 100
@@ -39,22 +39,35 @@ jtag newtap $_CHIPNAME cpu -irlen 5 -ircapture 0x1 -irmask 0x1f -expected-id $_C
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME mips_m4k -endian $_ENDIAN -chain-position $_TARGETNAME
-$_TARGETNAME configure -work-area-phys 0xa0000800 -work-area-size $_WORKAREASIZE -work-area-backup 0
+#
+# At reset the pic32mx does not allow code execution from RAM
+# we have to setup the BMX registers to allow this.
+# One limitation is that we loose the first 2k of RAM.
+#
+
+global _PIC32MX_DATASIZE
+global _PIC32MX_PROGSIZE
+set _PIC32MX_DATASIZE 0x800
+set _PIC32MX_PROGSIZE [expr ($_WORKAREASIZE - $_PIC32MX_DATASIZE)]
+$_TARGETNAME configure -work-area-phys 0xa0000800 -work-area-size $_PIC32MX_PROGSIZE -work-area-backup 0
$_TARGETNAME configure -event reset-init {
#
# from reset the pic32 cannot execute code in ram - enable ram execution
# minimum offset from start of ram is 2k
#
+ global _PIC32MX_DATASIZE
+ global _PIC32MX_PROGSIZE
+
# BMXCON
mww 0xbf882000 0x001f0040
- # BMXDKPBA: 0xa0000800
- mww 0xbf882010 0x00000800
- # BMXDUDBA
- mww 0xbf882020 0x00004000
- # BMXDUPBA
- mww 0xbf882030 0x00004000
+ # BMXDKPBA: 2k kernel data @ 0xa0000800
+ mww 0xbf882010 $_PIC32MX_DATASIZE
+ # BMXDUDBA: 16k kernel program @ 0xa0000800
+ mww 0xbf882020 $_PIC32MX_PROGSIZE
+ # BMXDUPBA: 0k user program
+ mww 0xbf882030 $_PIC32MX_PROGSIZE
}
set _FLASHNAME $_CHIPNAME.flash