riscv-openocd/tcl/target/am335x.cfg

if { [info exists CHIPNAME] } {
   set _CHIPNAME $CHIPNAME
} else {
   set _CHIPNAME am335x
}

# This chip contains an IcePick-D JTAG router.  The IcePick-C configuration is almost
# compatible, but it doesn't work.  For now, we will just embed the IcePick-D
# routines here.
proc icepick_d_tapenable {jrc port} {
	# select router
	irscan $jrc 7 -endstate IRPAUSE
	drscan $jrc 8 0x89 -endstate DRPAUSE

	# set ip control
	irscan $jrc 2 -endstate IRPAUSE
	drscan $jrc 32 [expr 0xa0002108 + ($port << 24)] -endstate DRPAUSE

	# for icepick_D
	irscan $jrc 2 -endstate IRPAUSE
	drscan $jrc 32 0xe0002008 -endstate DRPAUSE

	irscan $jrc 0x3F -endstate RUN/IDLE
	runtest 10
}

#
# M3 DAP
#
if { [info exists M3_DAP_TAPID] } {
	set _M3_DAP_TAPID $M3_DAP_TAPID
} else {
	set _M3_DAP_TAPID 0x4b6b902f
}
jtag newtap $_CHIPNAME m3_dap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_M3_DAP_TAPID -disable
jtag configure $_CHIPNAME.m3_dap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 11"

#
# Main DAP
#
if { [info exists DAP_TAPID] } {
   set _DAP_TAPID $DAP_TAPID
} else {
   set _DAP_TAPID 0x4b6b902f
}
jtag newtap $_CHIPNAME dap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_DAP_TAPID -disable
jtag configure $_CHIPNAME.dap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 12"

#
# ICEpick-D (JTAG route controller)
#
if { [info exists JRC_TAPID] } {
   set _JRC_TAPID $JRC_TAPID
} else {
   set _JRC_TAPID 0x0b94402f
}
jtag newtap $_CHIPNAME jrc -irlen 6 -ircapture 0x1 -irmask 0x3f -expected-id $_JRC_TAPID -ignore-version
jtag configure $_CHIPNAME.jrc -event setup "jtag tapenable $_CHIPNAME.dap"
# some TCK tycles are required to activate the DEBUG power domain
jtag configure $_CHIPNAME.jrc -event post-reset "runtest 100"

#
# Cortex A8 target
#
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME cortex_a -chain-position $_CHIPNAME.dap -dbgbase 0x80001000

# SRAM: 64K at 0x4030.0000; use the first 16K
$_TARGETNAME configure -work-area-phys 0x40300000 -work-area-size 0x4000

$_TARGETNAME configure -event gdb-attach {
   cortex_a dbginit
   halt
}