cfg: allow stm32discovery parameter override

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

# 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 {
   set _CHIPNAME pxa255
}

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

if { [info exists CPUTAPID] } {
   set _CPUTAPID $CPUTAPID
} else {
   set _CPUTAPID 0x69264013
}

jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id $_CPUTAPID

set _TARGETNAME $_CHIPNAME.cpu
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
}