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fix: Correct OpenOCD reset config to prevent libusb crash 

- The root cause of the 'mpsse_flush' and libusb errors was an
  incorrect reset configuration.
- Use 'reset_config srst_only separate' to correctly inform OpenOCD
  that the JTAG (nTRST) and system (nSRST) resets are independent.
- This allows the 'init' command to reliably establish JTAG communication
  before a system reset is issued.
This commit is contained in:
Castor Gemini 2025-08-21 02:34:09 -05:00 committed by Jeff Carr
parent dffde73965
commit 6a23954f1f
1 changed files with 15 additions and 25 deletions
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40
openocd-reboot.cfg
View File

@ -1,5 +1,5 @@
# OpenOCD Configuration to REBOOT a SiFive HiFive Pro P550 Board (v4)
# Compatible with OpenOCD 0.12.0
# OpenOCD Configuration to REBOOT a SiFive HiFive Pro P550 Board (v5)
# Correctly handles separate JTAG and System resets to prevent timeouts.
# ----------------------------------------------------------------
# 1. Adapter and Board Configuration
@ -30,32 +30,22 @@ target smp riscv.cpu0 riscv.cpu1 riscv.cpu2 riscv.cpu3
# 3. Reset Configuration and Execution
# ----------------------------------------------------------------
# Configure the reset type, but without the unsupported timing flags.
# We will control the pulse manually.
reset_config srst_only
# CRITICAL: Configure the reset strategy.
# 'srst_only': The 'reset' command will only pulse the nSRST line.
# 'separate': Tells OpenOCD that nSRST and nTRST are independent signals.
# This allows the 'init' command to correctly reset the JTAG TAP
# (using nTRST) before trying to communicate with it.
reset_config srst_only separate
# Initialize OpenOCD and connect to the target
# Initialize OpenOCD. This will now correctly reset the JTAG chain.
init
# --- Manual Reboot Sequence for OpenOCD 0.12.0 ---
echo "!!! Manually asserting system reset (nSRST)..."
# Pull nSRST low (active low, so '0' asserts it)
ftdi_set_signal nSRST 0
# Hold the reset for 100ms to ensure the board registers it
sleep 100
# Issue the system reset. Because of the config above, this will now
# cleanly pulse the nSRST line, causing a hardware reboot.
echo "!!! Issuing system reset to reboot the board..."
reset
echo "!!! De-asserting system reset and attempting to halt..."
# Release nSRST (set it back to high-impedance/inactive)
ftdi_set_signal nSRST 1
# Wait a moment for the board to start coming out of reset
sleep 100
# Immediately after releasing reset, halt the cores.
# This is the critical step to catch them before they boot the OS.
halt
echo "!!! System halted successfully. Resuming execution to boot..."
resume
echo "!!! Board has been reset and should be rebooting now."
# Exit OpenOCD
shutdown
shutdown