One of my three nRF54L15 devices has also become unable to upload. Below is the error message. I tried connecting JLink to the pads on the back of the board to attempt a bulk erase, but I couldn’t even connect JLink due to an “unknown error”.
What exactly was the situation where you couldn’t upload?
Linking .pio\build\seeed-xiao-nrf54l15\zephyr\firmware-pre0.elf
Memory region Used Size Region Size %age Used
FLASH: 23976 B 1428 KB 1.64%
RAM: 4504 B 188 KB 2.34%
IDT_LIST: 73 B 32 KB 0.22%
Generating ISR table .pio\build\seeed-xiao-nrf54l15\zephyr\isr_tables.c
Compiling .pio\build\seeed-xiao-nrf54l15\zephyr_final\zephyr\isr_tables.c.o
Linking .pio\build\seeed-xiao-nrf54l15\firmware.elf
Memory region Used Size Region Size %age Used
FLASH: 23976 B 1428 KB 1.64%
RAM: 4504 B 188 KB 2.34%
IDT_LIST: 0 GB 32 KB 0.00%
Checking size .pio\build\seeed-xiao-nrf54l15\firmware.elf
Advanced Memory Usage is available via “PlatformIO Home > Project Inspect”
RAM: [ ] 1.7% (used 4581 bytes from 262144 bytes)
Flash: [ ] 1.4% (used 22064 bytes from 1572864 bytes)
Building .pio\build\seeed-xiao-nrf54l15\firmware.hex
Configuring upload protocol…
AVAILABLE: cmsis-dap, jlink
CURRENT: upload_protocol = cmsis-dap
Uploading .pio\build\seeed-xiao-nrf54l15\firmware.hex
xPack Open On-Chip Debugger 0.12.0-01004-g9ea7f3d64-dirty (2023-01-30-15:04)
Licensed under GNU GPL v2
For bug reports, read
OpenOCD: Bug Reporting
debug_level: 1cortex_m reset_config sysresetreq
Error: Failed to read memory at 0xe000ed00
Warn : target nrf54l.cpu examination failed
Error: Target not examined yet*** [upload] Error 1