AVR debugwire in Linux

Have a look at avarice. It's man page also has something to say about debugwire. I don't know if that'll be good news or bad, though.

enable debugwire

enable with avrdude (fuse for attiny88):

avrdude -c dragon_isp -P usb -p attiny88 -v -U hfuse:w:0xd9:m

must be compiled with -ggdb or great (--gdb3) but doesn't seem to help with macros
no optimisations

COMPILE = $(GCC_PATH) -ggdb3 -Wall -Wextra $(OPTIMIZATION) -std=gnu11 -flto -mmcu=$(DEVICE) -DF_CPU=$(CLOCK)

need main.hex and main.elf

start avarice:

avarice -g -w -P attiny88 :4242

then start gdb:

avr-gdb main.elf

and connect:

target remote localhost:4242

only sw breakpoints with debugwire, so if need breakpoints use:

asm('break');

NB. VTG/VCC pin (2 on header) must be connected to chip supply for this to work!

avrdude -c dragon_isp -P usb -p attiny88 -v -U hfuse:w:0xdd:m