diff --git a/it87spi.c b/it87spi.c
index f06efba..fb1448a 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -339,7 +339,10 @@
 {
 	/*
 	 * IT8716F only allows maximum of 512 kb SPI chip size for memory
-	 * mapped access. It also can't write more than 1+3+256 bytes at once.
+	 * mapped access. It also can't write more than 1+3+256 bytes at once,
+	 * so page_size > 256 bytes needs a fallback.
+	 * FIXME: Split too big page writes into chunks IT87* can handle instead
+	 * of degrading to single-byte program.
 	 */
 	if ((programmer == PROGRAMMER_IT87SPI) ||
 	    (flash->total_size * 1024 > 512 * 1024) ||
@@ -349,9 +352,8 @@
 		int lenhere;
 
 		if (start % flash->page_size) {
-			/* start to the end of the page or start + len,
-			 * whichever is smaller. Page length is hardcoded to
-			 * 256 bytes (IT87 SPI hardware limitation).
+			/* start to the end of the page or to start + len,
+			 * whichever is smaller.
 			 */
 			lenhere = min(len, flash->page_size - start % flash->page_size);
 			spi_chip_write_1(flash, buf, start, lenhere);
@@ -360,7 +362,6 @@
 			buf += lenhere;
 		}
 
-		/* FIXME: Handle chips which have max writechunk size >1 and <256. */
 		while (len >= flash->page_size) {
 			it8716f_spi_page_program(flash, buf, start);
 			start += flash->page_size;
diff --git a/spi25.c b/spi25.c
index 39e9c8c..fc3173f 100644
--- a/spi25.c
+++ b/spi25.c
@@ -1309,7 +1309,7 @@
 	int i, result = 0;
 
 	for (i = start; i < start + len; i++) {
-		result = spi_byte_program(i, buf[i]);
+		result = spi_byte_program(i, buf[i - start]);
 		if (result)
 			return 1;
 		while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
@@ -1377,6 +1377,14 @@
 		if (spi_chip_write_1(flash, buf, start, start % 2))
 			return SPI_GENERIC_ERROR;
 		pos += start % 2;
+		cmds[1].writearr = (const unsigned char[]){
+					JEDEC_AAI_WORD_PROGRAM,
+					(pos >> 16) & 0xff,
+					(pos >> 8) & 0xff,
+					(pos & 0xff),
+					buf[pos - start],
+					buf[pos - start + 1]
+				};
 		/* Do not return an error for now. */
 		//return SPI_GENERIC_ERROR;
 	}
@@ -1406,8 +1414,8 @@
 
 	/* Are there at least two more bytes to write? */
 	while (pos < start + len - 1) {
-		cmd[1] = buf[pos++];
-		cmd[2] = buf[pos++];
+		cmd[1] = buf[pos++ - start];
+		cmd[2] = buf[pos++ - start];
 		spi_send_command(JEDEC_AAI_WORD_PROGRAM_CONT_OUTSIZE, 0, cmd, NULL);
 		while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
 			programmer_delay(10);
@@ -1420,7 +1428,7 @@
 
 	/* Write remaining byte (if any). */
 	if (pos < start + len) {
-		if (spi_chip_write_1(flash, buf + pos, pos, pos % 2))
+		if (spi_chip_write_1(flash, buf + pos - start, pos, pos % 2))
 			return SPI_GENERIC_ERROR;
 		pos += pos % 2;
 	}