add gdb directives on a per-board basis.

Author: umbynos

boards.txt

@@ -258,6 +258,16 @@ nano_33_iot.bootloader.tool.default=openocd
 nano_33_iot.bootloader.file=nano_33_iot/samd21_sam_ba_arduino_nano_33_iot.bin
 nano_33_iot.build.svd_file={runtime.platform.path}/svd/at91samd21g18.svd
 
+nano_33_iot.debug.cortex-debug.custom.postAttachCommands.0=set remote hardware-watchpoint-limit 2
+nano_33_iot.debug.cortex-debug.custom.postAttachCommands.1=monitor reset halt
+nano_33_iot.debug.cortex-debug.custom.postAttachCommands.2=monitor gdb_sync
+nano_33_iot.debug.cortex-debug.custom.postAttachCommands.3=thb setup
+nano_33_iot.debug.cortex-debug.custom.postAttachCommands.4=c
+nano_33_iot.debug.cortex-debug.custom.overrideRestartCommands.0=monitor reset halt
+nano_33_iot.debug.cortex-debug.custom.overrideRestartCommands.1=monitor gdb_sync
+nano_33_iot.debug.cortex-debug.custom.overrideRestartCommands.2=thb setup
+nano_33_iot.debug.cortex-debug.custom.overrideRestartCommands.3=c
+
 # Arduino MKR FOX 1200
 # --------------------
 mkrfox1200.name=Arduino MKR FOX 1200