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.

SUBDIR=	iram xip

all:	${SUBDIR}

${SUBDIR}: FRC
	cd $@; ${MAKE} ${MFLAGS}

clean: FRC
	rm -f *.[oa] *.out *errs
	for i in ${SUBDIR}; do (cd $$i; ${MAKE} ${MFLAGS} clean); done

FRC: