AT command interface works! The cause of the breakage was the same Nucleus API issue with NU_Create_Timer() which we encountered at the very beginning of this project with Riviera timers: the code in uartfax.c from TCS211 was passing 0 as the initial dummy value for the timer duration, and our FreeNucleus version doesn't like it. The fix is the same: pass 1 as the initial dummy value instead.

CC=	arm-elf-gcc
CFLAGS=	-Os -fno-builtin -mthumb-interwork -mthumb
ASFLAGS=-mthumb-interwork
LD=	arm-elf-ld

OBJS=	appinit.o exceptions.o irqfiq.o sysinit.o

all:	xipcode.o flashboot.o

flashboot.o:	flashboot.S vectors.S
sysinit.o:	sysinit.S vectors.S

xipcode.o:	${OBJS}
	${LD} -r -o $@ ${OBJS}

clean:
	rm -f *.[oa] *errs