riscv-openocd/tcl/target/pic32mx.cfg

if { [info exists CHIPNAME] } {
   set _CHIPNAME $CHIPNAME
} else {
   set _CHIPNAME pic32mx
}

if { [info exists ENDIAN] } {
   set _ENDIAN $ENDIAN
} else {
   set _ENDIAN little
}

if { [info exists CPUTAPID] } {
   set _CPUTAPID $CPUTAPID
} else {
   set _CPUTAPID 0x30938053
}

# default working area is 16384
if { [info exists WORKAREASIZE] } {
   set _WORKAREASIZE $WORKAREASIZE
} else {
   set _WORKAREASIZE 0x4000
}

adapter srst delay 100
jtag_ntrst_delay 100

#jtag scan chain
#format L IRC IRCM IDCODE (Length, IR Capture, IR Capture Mask, IDCODE)
jtag newtap $_CHIPNAME cpu -irlen 5 -ircapture 0x1 -irmask 0x1f -expected-id $_CPUTAPID

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME mips_m4k -endian $_ENDIAN -chain-position $_TARGETNAME

#
# 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 _WORKAREASIZE
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 _WORKAREASIZE

	# BMXCON	set 0 wait state option by clearing BMXWSDRM bit, bit 6
	mww 0xbf882000 0x001f0000
	# BMXDKPBA: 2k kernel data @ 0xa0000000
	mww 0xbf882010 $_PIC32MX_DATASIZE
	# BMXDUDBA: 14k kernel program @ 0xa0000800 - (BMXDUDBA - BMXDKPBA)
	mww 0xbf882020 $_WORKAREASIZE
	# BMXDUPBA: 0k user program - (BMXDUPBA - BMXDUDBA)
	mww 0xbf882030 $_WORKAREASIZE

	#
	# Set system clock to 8Mhz if the default clock configuration is set
	#

	# SYSKEY register, make sure OSCCON is locked
	mww 0xbf80f230 0x0
	# SYSKEY register, write unlock sequence
	mww 0xbf80f230 0xaa996655
	mww 0xbf80f230 0x556699aa
	# OSCCON register + 4, clear OSCCON FRCDIV bits: 24, 25 and 26, divided by 1
	mww 0xbf80f004 0x07000000
	# SYSKEY register, relock OSCCON
	mww 0xbf80f230 0x0
}

set _FLASHNAME $_CHIPNAME.flash0
flash bank $_FLASHNAME pic32mx 0x1fc00000 0 0 0 $_TARGETNAME
# add virtual banks for kseg0 and kseg1
flash bank vbank0 virtual 0xbfc00000 0 0 0 $_TARGETNAME $_FLASHNAME
flash bank vbank1 virtual 0x9fc00000 0 0 0 $_TARGETNAME $_FLASHNAME

set _FLASHNAME $_CHIPNAME.flash1
flash bank $_FLASHNAME pic32mx 0x1d000000 0 0 0 $_TARGETNAME
# add virtual banks for kseg0 and kseg1
flash bank vbank2 virtual 0xbd000000 0 0 0 $_TARGETNAME $_FLASHNAME
flash bank vbank3 virtual 0x9d000000 0 0 0 $_TARGETNAME $_FLASHNAME