riscv-openocd/src/jtag/startup.tcl

# Defines basic Tcl procs for OpenOCD JTAG module

# Executed during "init". Can be overridden
# by board/target/... scripts
proc jtag_init {} {
	if {[catch {jtag arp_init} err]!=0} {
		# try resetting additionally
		init_reset startup
	}
}

# This reset logic may be overridden by board/target/... scripts as needed
# to provide a reset that, if possible, is close to a power-up reset.
#
# Exit requirements include:  (a) JTAG must be working, (b) the scan
# chain was validated with "jtag arp_init" (or equivalent), (c) nothing
# stays in reset.  No TAP-specific scans were performed.  It's OK if
# some targets haven't been reset yet; they may need TAP-specific scans.
#
# The "mode" values include:  halt, init, run (from "reset" command);
# startup (at OpenOCD server startup, when JTAG may not yet work); and
# potentially more (for reset types like cold, warm, etc)
proc init_reset { mode } {
	jtag arp_init-reset
}

#########

# TODO: power_restore and power_dropout are currently neither
# documented nor supported except on ZY1000.

proc power_restore {} {
	puts "Sensed power restore."
	reset init
}

add_help_text power_restore "Overridable procedure run when power restore is detected. Runs 'reset init' by default."

proc power_dropout {} {
	puts "Sensed power dropout."
}

#########

# TODO: srst_deasserted and srst_asserted are currently neither
# documented nor supported except on ZY1000.

proc srst_deasserted {} {
	puts "Sensed nSRST deasserted."
	reset init
}
add_help_text srst_deasserted "Overridable procedure run when srst deassert is detected. Runs 'reset init' by default."

proc srst_asserted {} {
	puts "Sensed nSRST asserted."
}