diff --git a/src/Makefile b/src/Makefile
index a9cd663..60c61e7 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -16,10 +16,10 @@ SN_thhor = 1
 # config.c includes .eeprom `port_config`, that should go second
 # .bss: rtc, adc, flash, uart, spi, pipe
 C_FILES_thhor = config.c rtc.c adc.c flash.c uart.c cmd.c base85.c pwm.c spi.c bch4369.c pipe.c fpga.c
-S_FILES_thhor = uart_tx.S base85a.S spi_poll.S
+S_FILES_thhor = uart_tx.S base85a.S
 
 MCU = $(MCU_$(PROJ))
-OPT = -Os  -fverbose-asm
+OPT = -Os
 
 CC=avr-gcc -Wall -Wno-parentheses -MMD -std=c99 $(OPT) \
   -mmcu=$(MCU) \
diff --git a/src/config.c b/src/config.c
index 9cca87f..25ee61e 100644
--- a/src/config.c
+++ b/src/config.c
@@ -27,10 +27,6 @@ const struct config config = {
 	.pwm_min = 0x0000,
 	.pwm_max = 0xffff,
 #endif
-#ifdef HAVE_FPGA
-	.fpga_config_page = 1,
-	.fpga_config_count = 511,
-#endif
 };
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/src/config.h b/src/config.h
index c87f9bb..3412198 100644
--- a/src/config.h
+++ b/src/config.h
@@ -23,10 +23,8 @@ struct config {
 	uint16_t  pwm_min;
 	uint16_t  pwm_max;
 #endif
-#ifdef HAVE_FPGA
 	uint16_t  fpga_config_page;
 	uint16_t  fpga_config_count;
-#endif
 };
 
 enum magic_flags {
diff --git a/src/spi.c b/src/spi.c
index 98a4329..85cf3fa 100644
--- a/src/spi.c
+++ b/src/spi.c
@@ -15,243 +15,6 @@ struct_ioconf(spi_config) = {
 	conf_io(SPI.CTRLA, SPI_MASTER_bm | SPI_ENABLE_bm | SPI_SPEED),
 };
 
-#ifndef SPI_USE_IRQ
-
-#ifdef SPI_POLL_C
-
-static
-uint8_t spi_poll_delay()
-{
-	uint8_t t = 0xff;
-	uint8_t ifg;
-	do {
-		ifg = SPI.INTFLAGS & SPI_RXCIF_bm;
-	} while (~ifg && t--);
-	return ifg;
-}
-
-static
-void spi_poll_drop_tail()
-{
-	uint8_t ifg;
-	do {
-		ifg = SPI.INTFLAGS;
-		SPI.DATA;
-	} while (~ifg & SPI_TXCIF_bm);
-	spi_poll_delay();
-	SPI.DATA;
-}
-
-static
-void spi_poll_write_drop(uint8_t n, const uint8_t *c)
-{
-	do {
-		uint8_t ifg = SPI.INTFLAGS;
-		if (ifg & SPI_DREIF_bm) {
-			SPI.DATA = *c++;
-			SPI.INTFLAGS = SPI_TXCIF_bm;
-			n--;
-		}
-		SPI.DATA;
-	} while (n);
-	spi_poll_drop_tail();
-}
-
-static
-void spi_poll_zero_drop(uint8_t n)
-{
-	uint8_t z = spi.zero;
-	do {
-		uint8_t ifg = SPI.INTFLAGS;
-		if (ifg & SPI_DREIF_bm) {
-			SPI.DATA = z;
-			SPI.INTFLAGS = SPI_TXCIF_bm;
-			n--;
-		}
-		SPI.DATA;
-	} while (n);
-	spi_poll_drop_tail();
-}
-
-static
-uint8_t spi_poll_drop(uint8_t n, const uint8_t *c)
-{
-	if (c)
-		spi_poll_write_drop(n, c);
-	else
-		spi_poll_zero_drop(n);
-	return n;
-}
-
-static
-void spi_poll_read_tail(uint8_t r, uint8_t *d)
-{
-	uint8_t ifg;
-	do {
-		ifg = SPI.INTFLAGS;
-		if (ifg & SPI_RXCIF_bm) {
-			*d++ = SPI.DATA;
-			if (!--r)
-				goto done;
-		}
-	} while (~ifg & SPI_TXCIF_bm);
-
-	if (spi_poll_delay()) {
-		*d = SPI.DATA;
-		r--;
-	}
-done:
-	spi.rdata = d;
-	spi.rsize = r;
-}
-
-static
-uint8_t spi_poll_write_read(uint8_t n, const uint8_t *c)
-{
-	uint8_t r = spi.rsize;
-	uint8_t *d = spi.rdata;
-	uint8_t w = n;
-	do {
-		uint8_t ifg = SPI.INTFLAGS;
-		if (ifg & SPI_DREIF_bm) {
-			SPI.DATA = *c++;
-			SPI.INTFLAGS = SPI_TXCIF_bm;
-			if (!--n) {
-				spi_poll_read_tail(r, d);
-				return w;
-			}
-		}
-		if (ifg & SPI_RXCIF_bm) {
-			*d++ = SPI.DATA;
-			r--;
-		}
-	} while(r);
-	spi.rdata = d;
-	spi.rsize = r;
-	return w-n;
-}
-
-static
-uint8_t spi_poll_read(uint8_t n, uint8_t r, uint8_t *d)
-{
-	uint8_t z = spi.zero;
-	uint8_t w = n;
-	do {
-		uint8_t ifg = SPI.INTFLAGS;
-		if (ifg & SPI_DREIF_bm) {
-			SPI.DATA = z;
-			SPI.INTFLAGS = SPI_TXCIF_bm;
-			if (!--n) {
-				spi_poll_read_tail(r, d);
-				return w;
-			}
-		}
-		if (ifg & SPI_RXCIF_bm) {
-			*d++ = SPI.DATA;
-			r--;
-		}
-	} while(r);
-	spi.rdata = d;
-	spi.rsize = r;
-	return w-n;
-}
-
-static
-uint8_t spi_poll_wait(uint8_t n)
-{
-	uint8_t r = spi.rsize;
-	uint8_t *d = spi.rdata;
-	uint8_t z = spi.zero;
-	uint8_t w = n;
-	do {
-		uint8_t ifg = SPI.INTFLAGS;
-		if (ifg & SPI_DREIF_bm) {
-			SPI.DATA = z;
-			SPI.INTFLAGS = SPI_TXCIF_bm;
-			if (!--n) {
-				spi_poll_read_tail(r, d);
-				return w;
-			}
-		}
-		if (ifg & SPI_RXCIF_bm) {
-			uint8_t b = SPI.DATA;
-			if ((b & spi.mask) == spi.wait) {
-				*d++ = SPI.DATA;
-				r--;
-				spi.mask = 0;
-				break;
-			}
-			else
-				n++;
-		}
-	} while (1);
-	if (r)
-		return w - n + spi_poll_read(n, r, d);
-	spi.rdata = d;
-	spi.rsize = r;
-	return w-n;
-}
-
-static
-uint8_t spi_poll_write(uint8_t n, const uint8_t *c)
-{
-	uint8_t i = spi.isize;
-	uint8_t r = spi.rsize;
-	uint8_t w =0;
-	while (n) {
-		if (!r)
-			i = n;
-		if (i) {
-			if (i < n) {
-				uint8_t ww = spi_poll_drop(i, c);
-				w += ww;
-				c += ww;
-				n -= ww;
-				spi.isize = i = 0;
-				continue;
-			}
-			spi.isize = i -= n;
-			uint8_t ww = spi_poll_drop(n, c);
-			w += ww;
-			return w;
-		}
-		if (c)
-			w += spi_poll_write_read(n, c);
-		else if (spi.mask)
-			w += spi_poll_wait(n);
-		else
-			w += spi_poll_read(n, r, spi.rdata);
-	}
-	return w;
-}
-
-uint8_t spi_poll()
-{
-	uint8_t n;
-	n = spi_poll_write(spi.csize, spi.cmd);
-	spi.cmd += n;
-	spi.csize -= n;
-	n = spi_poll_write(spi.zsize, 0);
-	spi.zsize -= n;
-	n = spi_poll_write(spi.wsize, spi.wdata);
-	spi.wdata += n;
-	spi.wsize -= n;
-	return 0;
-}
-
-#endif // SPI_POLL_C
-
-#else // SPI_USE_IRQ
-
-/****************************************************
-
-The SPI is way to fast for this CPU, the job is done
-in a single IRQ invocation.
-
-Running the SPI synchronously allows other Interrupts
-to happen.
-****************************************************/
-
 #if 0
 ISR(SPI0_INT_vect)
 {
@@ -464,8 +227,6 @@ ISR(SPI0_INT_vect, ISR_NAKED)
 }
 #endif
 
-#endif // SPI_USE_IRQ
-
 uint8_t spi_select(uint8_t mode)
 {
 	uint8_t s = spi_busy_p();
diff --git a/src/spi.h b/src/spi.h
index 83c480f..e1e01cc 100644
--- a/src/spi.h
+++ b/src/spi.h
@@ -33,37 +33,6 @@ enum spi_mode_bits {
 	SPI_CONT    = 0x80,
 };
 
-#define SPI_USE_IRQ
-
-#ifndef SPI_USE_IRQ
-
-#ifdef SPI_POLL_C
-uint8_t	spi_poll();
-#else
-uint8_t	_spi_poll();
-#define spi_poll _spi_poll
-#endif
-
-static inline
-uint8_t spi_abort()
-{
-	return spi_poll();
-}
-
-static inline
-uint8_t spi_busy_p()
-{
-	return spi_poll();
-}
-
-static inline
-void  spi_start()
-{
-	spi_poll();
-}
-
-#else // SPI_USE_IRQ
-
 static inline
 uint8_t spi_abort()
 {
@@ -86,8 +55,6 @@ void  spi_start()
 	SPI.INTCTRL = SPI_DREIF_bm | SPI_TXCIF_bm| SPI_RXCIF_bm;
 }
 
-#endif // SPI_USE_IRQ
-
 static inline void barrier() { __asm__("":::"memory"); }
 void init_spi(uint8_t spi_div);
 uint8_t spi_select(uint8_t mode);
diff --git a/src/spi_poll.S b/src/spi_poll.S
deleted file mode 100644
index c11c529..0000000
--- a/src/spi_poll.S
+++ /dev/null
@@ -1,204 +0,0 @@
-#include <avr/io.h>
-#define INTFLAGS SPI0_INTFLAGS
-#define DATA SPI0_DATA
-#define RXC SPI_RXCIF_bp
-#define TXC SPI_TXCIF_bp
-#define DRE SPI_DREIF_bp
-#define csize Y+1
-#define zsize Y+2
-#define isize Y+3
-#define zero  Y+4
-#define wait  Y+5
-#define mask  Y+6
-#define rsize Y+7
-#define wsize Y+8
-#define cmd   Y+9
-#define rdata Y+11
-#define wdata Y+13
-
-	.global _spi_poll
-
-_spi_poll:
-	push r28
-	push r29
-	ldi  r28, lo8(spi)
-	ldi  r29, hi8(spi)
-	ldd  r18, mask
-	;    r19, wait, …
-	ldd  r20, isize
-	ldd  r21, zero
-	ldd  r22, rsize
-	ldi  r23, 1<<TXC
-	;    r24, [czw]size
-	;    r25, INTFLAG
-	;      X, [cw]data
-	ldd  r30, rdata
-	ldd  r31, rdata+1
-
-	ldd  r24, csize
-	tst  r24
-	breq 1f
-	ldd  r26, cmd
-	ldd  r27, cmd+1
-	rcall _write
-	std  csize, r24
-	std  cmd,   r26
-	std  cmd+1, r27
-1:	ldd  r24, zsize
-	tst  r24
-	breq 1f
-	mov  r26, r1
-	mov  r27, r1
-	rcall _write
-	std  zsize, r24
-1:	ldd  r24, wsize
-	tst  r24
-	breq 1f
-	ldd  r26, wdata
-	ldd  r27, wdata+1
-	rcall _write
-	std  wsize, r24
-	std  wdata, r26
-	std  wdata+1, r27
-1:	std  isize, r21
-	std  rsize, r22
-	std  rdata, r30
-	std  rdata+1, r31
-	mov  r24, 0
-	pop  r29
-	pop  r28
-	ret
-
-_write_read:
-	lds  r25, INTFLAGS
-	sbrs r25, DRE
-	rjmp 1f
-	ld   r0, X+
-	sts  DATA, r0
-	sts  INTFLAGS, r23
-	subi r24, 1
-	breq _read_tail
-	sbrs r25, RXC
-	rjmp _write_read
-	lds  r0, DATA
-	st   Z+, r0
-	subi r22, 1
-	brne _write_read
-	rjmp _write_drop
-
-_read_tail:
-	lds  r25, INTFLAGS
-	sbrs r25, RXC
-	rjmp 1f
-	lds  r0, DATA
-	st   Z+, r0
-	subi r22, 1
-	breq 9f
-1:	sbrs r25, TXC
-	rjmp _read_tail
-	rcall _delay
-	sbrs r25, RXC
-	rjmp 9f
-	lds  r0, DATA
-	st   Z+, r0
-	subi r22, 1
-9:	ret
-
-_w1:	mov  r20, r24 ; no rsize, i=n
-_w2:	sub  r20, r24 ; isize = i-n
-	brcc _drop
-	add  r24, r20 ; n = n + (i-n) = i
-	neg  r20      ; next n = n-i
-	push r20
-	mov  r20, r1  ; i = 0
-	rcall _drop
-	pop  r24
-_write:
-	tst  r22
-	breq _w1
-	tst  r20
-	brne _w2
-	mov  r0, r26
-	or   r0, r27
-	brne _write_read
-_zero_read:
-	lds  r25, INTFLAGS
-	sbrs r25, DRE
-	rjmp 1f
-	sts  DATA, r21
-	sts  INTFLAGS, r23
-	subi r24, 1
-	breq _read_tail
-1:	sbrs r25, RXC
-	rjmp _zero_read
-	lds  r0, DATA
-_zr:	st   Z+, r0
-	subi r22, 1
-	brne _zero_read
-9:	ret
-
-_zero_wait:
-	lds  r25, INTFLAGS
-	sbrs r25, DRE
-	rjmp 1f
-	sts  DATA, r21
-	sts  INTFLAGS, r23
-	subi r24, 1
-	breq _read_tail
-1:	sbrs r25, RXC
-	rjmp _zero_wait
-	subi r24, -1
-	lds  r0, DATA
-	ldd  r19, wait
-	eor  r19, r0
-	and  r19, r18
-	brne _zero_wait
-	subi r24, 1
-	rjmp _zr
-
-_drop:
-	mov  r0, r26
-	or   r0, r27
-	brne _write_drop
-	tst  r18
-	brne _zero_wait
-_zero_drop:
-	lds  r25, INTFLAGS
-	lds  r0, DATA
-	sbrs r25, DRE
-	rjmp _zero_drop
-	sts  DATA, r21
-	sts  INTFLAGS, r23
-	subi r24, 1
-	brne _zero_drop
-	rjmp _drop_tail
-
-_write_drop:
-	lds  r25, INTFLAGS
-	lds  r0, DATA
-	sbrs r25, DRE
-	rjmp _write_drop
-	ld   r0, X+
-	sts  DATA, r0
-	sts  INTFLAGS, r23
-	subi r24, 1
-	brne _write_drop
-_drop_tail:
-	lds  r25, INTFLAGS
-	lds  r0, DATA
-	sbrs r25, TXC
-	rjmp _drop_tail
-	rcall _delay
-	lds  r0, DATA
-9:	ret
-
-_delay:
-	ldi  r19, 0xff
-1:	lds  r25, INTFLAGS
-	sbrc r25, RXC
-	ret
-	subi r19, 1
-	brcc 1b
-9:	ret
-
-_spi_poll_end: