---
** [tickets:#299] OpenOCD SAMD21 programming from RPI Error Flash write
discontinued / NVM programming error**
**Status:** new
**Milestone:** 0.10.0
**Created:** Wed Mar 17, 2021 04:24 PM UTC by Gregory Cronin
**Last Updated:** Wed Mar 17, 2021 04:24 PM UTC
**Owner:** nobody
I am trying to use OpenOCD + RPi to program an ATSAMD21J18A via SWD. I have a
connection, can see flash info but programming fails with a Flash write
discontinued / NVM programming error.
I have a feeling it has something to do with Erase or reset.
**This is the error point:**
** Programming Started **
Flash write discontinued at 0x00012f84, next section at
0x00013f00
SAMD: NVM programming error
Failed to erase row containing 00000200
SAMD: failed to erase sector 2 at 0x00000200
failed erasing sectors 0 to 303
embedded:startup.tcl:530: Error: ** Programming Failed **
in procedure 'program'
in procedure 'program_error' called at file
"embedded:startup.tcl", line 595
at file "embedded:startup.tcl", line 530
My code:
sudo openocd -f interface/raspberrypi2-native.cfg \
-c "transport select swd" \
-c "set WORKAREASIZE 0" \
-c "set CHIPNAME at91samd21j18" \
-c "adapter speed 400" \
-c "adapter srst delay 200" \
-f target/at91samdXX.cfg \
-c "at91samd bootloader 0" \
-c "program openocd_hex/123456.hex verify"\
-c "at91samd bootloader 8192"
raspberrypi2-native.cfg file
adapter driver bcm2835gpio
bcm2835gpio_peripheral_base 0x3F000000
# Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
# These depend on system clock, calibrated for stock 700MHz
# bcm2835gpio_speed SPEED_COEFF SPEED_OFFSET
bcm2835gpio_speed_coeffs 146203 36
# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
# Header pin numbers: 23 22 19 21
bcm2835gpio_jtag_nums 11 25 10 9
# Each of the SWD lines need a gpio number set: swclk swdio
# Header pin numbers: SWCLK:23 SWDIO:22
bcm2835gpio_swd_nums 11 25
# If you define trst or srst, use appropriate reset_config
# Header pin numbers: TRST - 26, SRST - 18
# bcm2835gpio_trst_num 7
# reset_config trst_only
bcm2835gpio_srst_num 24
# reset_config srst_only srst_push_pull
# or if you have both connected,
# reset_config trst_and_srst srst_push_pull
I've used telnet localhost 4444 to feed line by line, but I get the same error
when I try to program. Tried changing adapter speed/delay, tried flash
write_image, flash info 0 shows no protection.
How critical is the reset pin connection for this set-up. I may have an issue
there.
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