First throw at UART.

hw/efinix_fpga/test_programs/Makefile

@@ -1,11 +1,11 @@
-TARGETS=stacktest runram timer timer_irq multiplier divider
+TARGETS=stacktest runram timer timer_irq multiplier divider uart
 SRC=$(wildcard *.s)
 DIR=../ip/bram
 
 all: $(TARGETS)
 
 $(TARGETS): $(SRC)
-	cl65 --cpu 65c02 -C link.ld -l $@.list $@.s
+	cl65 --cpu 65c02 -t none -C link.ld -l $@.list $@.s
 	xxd -ps $@ | fold -w 2 > $@.hex
 
 install:

hw/efinix_fpga/test_programs/uart.s

@@ -0,0 +1,28 @@
+.code
+
+UART_TX = $efe6
+UART_RX = UART_TX
+UART_STATUS = $efe7
+UART_CONTROL = UART_STATUS
+
+main:
+    ldx #$00
+loop:
+    lda string,x
+    sta UART_TX
+
+end:
+    wai
+    bra end
+
+
+
+string:
+    .asciiz "Hello, world!"
+
+
+.segment "VECTORS"
+
+.addr main
+.addr main
+.addr main