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fix: Improve OpenOCD stability for P550 reboot 

- Add explicit 'adapter speed' to fix low-speed warning.
- Separate nSRST and nTRST handling in 'reset_config' to prevent
  JTAG communication timeouts ('mpsse_flush' errors).
This commit is contained in:
Castor Gemini 2025-08-21 02:29:13 -05:00 committed by Jeff Carr
parent 780d7851a7
commit 7ea9888a5d
1 changed files with 13 additions and 9 deletions
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22
openocd-reboot.cfg
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@ -1,4 +1,4 @@
# OpenOCD Configuration to REBOOT a SiFive HiFive Pro P550 Board (v2)
# OpenOCD Configuration to REBOOT a SiFive HiFive Pro P550 Board (v3)
# ----------------------------------------------------------------
# 1. Adapter and Board Configuration
@ -6,6 +6,12 @@
adapter driver ftdi
ftdi channel 2
ftdi vid_pid 0x0403 0x6011
# NEW: Set the JTAG clock speed.
# Start with a conservative but reasonable speed. 1000 kHz = 1 MHz.
# If this works, you can try increasing it to 5000 or 10000 for faster performance.
adapter speed 1000
ftdi layout_init 0x0808 0x0a1b
ftdi layout_signal nSRST -oe 0x0200
ftdi layout_signal nTRST -data 0x0100 -oe 0x0100
@ -27,18 +33,16 @@ target smp riscv.cpu0 riscv.cpu1 riscv.cpu2 riscv.cpu3
# 3. Reset Configuration and Execution
# ----------------------------------------------------------------
# Configure the reset signal.
# srst_only: Asserts only nSRST.
# srst_pulls_trst: Informs OpenOCD that nSRST and nTRST are connected.
# srst_assert_width: Hold the reset signal for 100ms (a good, long pulse).
# srst_deassert_delay: Wait 100ms after releasing reset for the system to stabilize.
reset_config srst_only srst_pulls_trst srst_assert_width 100 srst_deassert_delay 100
# MODIFIED: Changed the reset configuration.
# By removing 'srst_pulls_trst', we are telling OpenOCD to handle the
# JTAG reset (nTRST) and the system reset (nSRST) as separate signals.
# This is often more reliable on complex SoCs.
reset_config srst_only srst_assert_width 100 srst_deassert_delay 100
# Initialize OpenOCD and connect to the target
init
# --- The Improved Reboot Sequence ---
# This is the most reliable way to gain control and issue a reset.
# 'reset halt' asserts the reset line, then immediately halts the cores
# as they come out of reset, before they can execute any code.
echo "!!! Issuing reset halt to gain control..."
@ -49,4 +53,4 @@ echo "!!! Resuming execution to complete the reboot..."
resume
# Exit OpenOCD
shutdown
shutdown