diff --git a/Makefile b/Makefile
index 3b24bc4..ae2b39f 100644
--- a/Makefile
+++ b/Makefile
@@ -317,7 +317,7 @@
 CHIP_OBJS = jedec.o stm50flw0x0x.o w39.o w29ee011.o \
 	sst28sf040.o m29f400bt.o 82802ab.o pm49fl00x.o \
 	sst49lfxxxc.o sst_fwhub.o flashchips.o spi.o spi25.o spi25_statusreg.o \
-	opaque.o sfdp.o en29lv640b.o
+	opaque.o sfdp.o en29lv640b.o at45db.o
 
 ###############################################################################
 # Library code.
diff --git a/at45db.c b/at45db.c
new file mode 100644
index 0000000..82196d0
--- /dev/null
+++ b/at45db.c
@@ -0,0 +1,473 @@
+/*
+ * Support for Atmel AT45DB series DataFlash chips.
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2012 Aidan Thornton
+ * Copyright (C) 2013 Stefan Tauner
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <string.h>
+#include "flash.h"
+#include "chipdrivers.h"
+#include "programmer.h"
+#include "spi.h"
+
+/* Status register bits */
+#define AT45DB_READY	(1<<7)
+#define AT45DB_CMP	(1<<6)
+#define AT45DB_PROT	(1<<1)
+#define AT45DB_POWEROF2	(1<<0)
+
+/* Opcodes */
+#define AT45DB_STATUS 0xD7 /* NB: this is a block erase command on most other chips(!). */
+#define AT45DB_DISABLE_PROTECT 0x3D, 0x2A, 0x7F, 0x9A
+#define AT45DB_READ_PROTECT 0x32
+#define AT45DB_READ_LOCKDOWN 0x35
+#define AT45DB_PAGE_ERASE 0x81
+#define AT45DB_BLOCK_ERASE 0x50
+#define AT45DB_SECTOR_ERASE 0x7C
+#define AT45DB_CHIP_ERASE 0xC7
+#define AT45DB_CHIP_ERASE_ADDR 0x94809A /* Magic address. See usage. */
+#define AT45DB_BUFFER1_WRITE 0x84
+#define AT45DB_BUFFER1_PAGE_PROGRAM 0x88
+/* Buffer 2 is unused yet.
+#define AT45DB_BUFFER2_WRITE 0x87
+#define AT45DB_BUFFER2_PAGE_PROGRAM 0x89
+*/
+
+static uint8_t at45db_read_status_register(struct flashctx *flash, uint8_t *status)
+{
+	static const uint8_t cmd[] = { AT45DB_STATUS };
+
+	int ret = spi_send_command(flash, sizeof(cmd), 1, cmd, status);
+	if (ret != 0)
+		msg_cerr("Reading the status register failed!\n");
+	else
+		msg_cspew("Status register: 0x%02x.\n", *status);
+	return ret;
+}
+
+int spi_disable_blockprotect_at45db(struct flashctx *flash)
+{
+	static const uint8_t cmd[4] = { AT45DB_DISABLE_PROTECT }; /* NB: 4 bytes magic number */
+	int ret = spi_send_command(flash, sizeof(cmd), 0, cmd, NULL);
+	if (ret != 0) {
+		msg_cerr("Sending disable lockdown failed!\n");
+		return ret;
+	}
+	uint8_t status;
+	ret = at45db_read_status_register(flash, &status);
+	if (ret != 0 || ((status & AT45DB_PROT) != 0)) {
+		msg_cerr("Disabling lockdown failed!\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+static unsigned int at45db_get_sector_count(struct flashctx *flash)
+{
+	unsigned int i, j;
+	unsigned int cnt = 0;
+	for (i = 0; i < NUM_ERASEFUNCTIONS; i++) {
+		if (flash->chip->block_erasers[i].block_erase == &spi_erase_at45db_sector) {
+			for (j = 0; j < NUM_ERASEREGIONS; j++) {
+				cnt += flash->chip->block_erasers[i].eraseblocks[j].count;
+			}
+		}
+	}
+	msg_cspew("%s: number of sectors=%u\n", __func__, cnt);
+	return cnt;
+}
+
+/* Reads and prettyprints protection/lockdown registers.
+ * Some elegance of the printouts had to be cut down a bit to share this code. */
+static uint8_t at45db_prettyprint_protection_register(struct flashctx *flash, uint8_t opcode, const char *regname)
+{
+	const uint8_t cmd[] = { opcode, 0, 0, 0 };
+	/* The first two sectors share the first result byte. */
+	uint8_t buf[at45db_get_sector_count(flash) - 1];
+
+	int ret = spi_send_command(flash, sizeof(cmd), sizeof(buf), cmd, buf);
+	if (ret != 0) {
+		msg_cerr("Reading the %s register failed!\n", regname);
+		return ret;
+	}
+
+	unsigned int i;
+	for (i = 0; i < sizeof(buf); i++) {
+		if (buf[i] != 0x00)
+			break;
+		if (i == sizeof(buf) - 1) {
+			msg_cdbg("No Sector is %sed.\n", regname);
+			return 0;
+		}
+	}
+
+	/* TODO: print which addresses are mapped to (un)locked sectors. */
+	msg_cdbg("Sector 0a is %s%sed.\n", ((buf[0] & 0xC0) == 0x00) ? "un" : "", regname);
+	msg_cdbg("Sector 0b is %s%sed.\n", ((buf[0] & 0x30) == 0x00) ? "un" : "", regname);
+	for (i = 1; i < sizeof(buf); i++)
+		msg_cdbg("Sector %2u is %s%sed.\n", i, (buf[i] == 0x00) ? "un" : "", regname);
+
+	return 0;
+}
+
+/* bit 7: busy flag
+ * bit 6: memory/buffer compare result
+ * bit 5-2: density (encoding see below)
+ * bit 1: protection enabled (soft or hard)
+ * bit 0: "power of 2" page size indicator (e.g. 1 means 256B; 0 means 264B)
+ *
+ * 5-2 encoding: bit 2 is always 1, bits 3-5 encode the density as "2^(bits - 1)" in Mb e.g.:
+ * AT45DB161D  1011  16Mb */
+int spi_prettyprint_status_register_at45db(struct flashctx *flash)
+{
+	uint8_t status;
+	if (at45db_read_status_register(flash, &status) != 0) {
+		return 1;
+	}
+
+	msg_cdbg("Chip status register is 0x%02x\n", status);
+	msg_cdbg("Chip status register: Bit 7 / Ready is %sset\n", (status & AT45DB_READY) ? "" : "not ");
+	msg_cdbg("Chip status register: Bit 6 / Compare match is %sset\n", (status & AT45DB_CMP) ? "" : "not ");
+	spi_prettyprint_status_register_bit(status, 5);
+	spi_prettyprint_status_register_bit(status, 4);
+	spi_prettyprint_status_register_bit(status, 3);
+	spi_prettyprint_status_register_bit(status, 2);
+	const uint8_t dens = (status >> 3) & 0x7; /* Bit 2 is always 1, we use the other bits only */
+	msg_cdbg("Chip status register: Density is %u Mb\n", 1 << (dens - 1));
+	msg_cdbg("Chip status register: Bit 1 / Protection is %sset\n", (status & AT45DB_PROT) ? "" : "not ");
+	msg_cdbg("Chip status register: Bit 0 / \"Power of 2\" is %sset\n",
+		 (status & AT45DB_POWEROF2) ? "" : "not ");
+	if (status & AT45DB_PROT)
+		at45db_prettyprint_protection_register(flash, AT45DB_READ_PROTECT, "protect");
+
+	at45db_prettyprint_protection_register(flash, AT45DB_READ_LOCKDOWN, "lock");
+
+	return 0;
+}
+
+/* Probe function for AT45DB* chips that support multiple page sizes. */
+int probe_spi_at45db(struct flashctx *flash)
+{
+	uint8_t status;
+	struct flashchip *chip = flash->chip;
+
+	if (!probe_spi_rdid(flash))
+		return 0;
+
+	/* Some AT45DB* chips support two different page sizes each (e.g. 264 and 256 B). In order to tell which
+	 * page size this chip has we need to read the status register. */
+	if (at45db_read_status_register(flash, &status) != 0)
+		return 0;
+
+	/* We assume sane power-of-2 page sizes and adjust the chip attributes in case this is not the case. */
+	if ((status & AT45DB_POWEROF2) == 0) {
+		chip->total_size = (chip->total_size / 32) * 33;
+		chip->page_size = (chip->page_size / 32) * 33;
+
+		unsigned int i, j;
+		for (i = 0; i < NUM_ERASEFUNCTIONS; i++) {
+			struct block_eraser *eraser = &chip->block_erasers[i];
+			for (j = 0; j < NUM_ERASEREGIONS; j++) {
+				eraser->eraseblocks[j].size = (eraser->eraseblocks[j].size / 32) * 33;
+			}
+		}
+	}
+
+	switch (chip->page_size) {
+	case 256: chip->gran = write_gran_256bytes; break;
+	case 264: chip->gran = write_gran_264bytes; break;
+	case 512: chip->gran = write_gran_512bytes; break;
+	case 528: chip->gran = write_gran_528bytes; break;
+	case 1024: chip->gran = write_gran_1024bytes; break;
+	case 1056: chip->gran = write_gran_1056bytes; break;
+	default:
+		msg_cerr("%s: unknown page size %d.\n", __func__, chip->page_size);
+		return 0;
+	}
+
+	msg_cdbg2("%s: total size %i kB, page size %i B\n", __func__, chip->total_size * 1024, chip->page_size);
+
+	return 1;
+}
+
+/* Returns the minimum number of bits needed to represent the given address.
+ * FIXME: use mind-blowing implementation.
+ * FIXME: move to utility module. */
+static uint32_t address_to_bits(uint32_t addr)
+{
+	unsigned int lzb = 0;
+	while (((1 << (31 - lzb)) & ~addr) != 0)
+		lzb++;
+	return 32 - lzb;
+}
+
+/* In case of non-power-of-two page sizes we need to convert the address flashrom uses to the address the
+ * DataFlash chips use. The latter uses a segmented address space where the page address is encoded in the
+ * more significant bits and the offset within the page is encoded in the less significant bits. The exact
+ * partition depends on the page size.
+ */
+static unsigned int at45db_convert_addr(unsigned int addr, unsigned int page_size)
+{
+	unsigned int page_bits = address_to_bits(page_size - 1);
+	unsigned int at45db_addr = ((addr / page_size) << page_bits) | (addr % page_size);
+	msg_cspew("%s: addr=0x%x, page_size=%u, page_bits=%u -> at45db_addr=0x%x\n",
+		  __func__, addr, page_size, page_bits, at45db_addr);
+	return at45db_addr;
+}
+
+int spi_read_at45db(struct flashctx *flash, uint8_t *buf, unsigned int addr, unsigned int len)
+{
+	const unsigned int page_size = flash->chip->page_size;
+	const unsigned int total_size = flash->chip->total_size * 1024;
+	if ((addr + len) > total_size) {
+		msg_cerr("%s: tried to read beyond flash boundary: addr=%u, len=%u, size=%u\n",
+			 __func__, addr, len, total_size);
+		return 1;
+	}
+
+	/* We have to split this up into chunks to fit within the programmer's read size limit, but those
+	 * chunks can cross page boundaries. */
+	const unsigned int max_data_read = flash->pgm->spi.max_data_read;
+	const unsigned int max_chunk = (max_data_read > 0) ? max_data_read : page_size;
+	while (addr < len) {
+		unsigned int chunk = min(max_chunk, len);
+		int ret = spi_nbyte_read(flash, at45db_convert_addr(addr, page_size), buf + addr, chunk);
+		if (ret) {
+			msg_cerr("%s: error sending read command!\n", __func__);
+			return ret;
+		}
+		addr += chunk;
+	}
+
+	return 0;
+}
+
+/* Returns 0 when ready, 1 on errors and timeouts. */
+static int at45db_wait_ready (struct flashctx *flash, unsigned int us, unsigned int retries)
+{
+	while (true) {
+		uint8_t status;
+		int ret = at45db_read_status_register(flash, &status);
+		if ((status & AT45DB_READY) == AT45DB_READY)
+			return 0;
+		if (ret != 0 || retries-- == 0)
+			return 1;
+		programmer_delay(us);
+	}
+}
+
+static int at45db_erase(struct flashctx *flash, uint8_t opcode, unsigned int at45db_addr, unsigned int stepsize, unsigned int retries)
+{
+	const uint8_t cmd[] = {
+		opcode,
+		(at45db_addr >> 16) & 0xff,
+		(at45db_addr >> 8) & 0xff,
+		(at45db_addr >> 0) & 0xff
+	};
+
+	/* Send erase command. */
+	int ret = spi_send_command(flash, sizeof(cmd), 0, cmd, NULL);
+	if (ret != 0) {
+		msg_cerr("%s: error sending erase command!\n", __func__);
+		return ret;
+	}
+
+	/* Wait for completion. */
+	ret = at45db_wait_ready(flash, stepsize, retries);
+	if (ret != 0)
+		msg_cerr("%s: chip did not became ready again after sending the erase command!\n", __func__);
+
+	return ret;
+}
+
+int spi_erase_at45db_page(struct flashctx *flash, unsigned int addr, unsigned int blocklen)
+{
+	const unsigned int page_size = flash->chip->page_size;
+	const unsigned int total_size = flash->chip->total_size * 1024;
+	
+	if ((addr % page_size) != 0 || (blocklen % page_size) != 0) {
+		msg_cerr("%s: cannot erase partial pages: addr=%u, blocklen=%u\n", __func__, addr, blocklen);
+		return 1;
+	}
+
+	if ((addr + blocklen) > total_size) {
+		msg_cerr("%s: tried to erase a block beyond flash boundary: addr=%u, blocklen=%u, size=%u\n",
+			 __func__, addr, blocklen, total_size);
+		return 1;
+	}
+
+	/* Needs typically about 35 ms for completion, so let's wait 100 ms in 500 us steps. */
+	return at45db_erase(flash, AT45DB_PAGE_ERASE, at45db_convert_addr(addr, page_size), 500, 200);
+}
+
+int spi_erase_at45db_block(struct flashctx *flash, unsigned int addr, unsigned int blocklen)
+{
+	const unsigned int page_size = flash->chip->page_size;
+	const unsigned int total_size = flash->chip->total_size * 1024;
+	
+	if ((addr % page_size) != 0 || (blocklen % page_size) != 0) { // FIXME: should check blocks not pages
+		msg_cerr("%s: cannot erase partial pages: addr=%u, blocklen=%u\n", __func__, addr, blocklen);
+		return 1;
+	}
+
+	if ((addr + blocklen) > total_size) {
+		msg_cerr("%s: tried to erase a block beyond flash boundary: addr=%u, blocklen=%u, size=%u\n",
+			 __func__, addr, blocklen, total_size);
+		return 1;
+	}
+
+	/* Needs typically between 20 and 100 ms for completion, so let's wait 300 ms in 1 ms steps. */
+	return at45db_erase(flash, AT45DB_BLOCK_ERASE, at45db_convert_addr(addr, page_size), 1000, 300);
+}
+
+int spi_erase_at45db_sector(struct flashctx *flash, unsigned int addr, unsigned int blocklen)
+{
+	const unsigned int page_size = flash->chip->page_size;
+	const unsigned int total_size = flash->chip->total_size * 1024;
+	
+	if ((addr % page_size) != 0 || (blocklen % page_size) != 0) { // FIXME: should check sectors not pages
+		msg_cerr("%s: cannot erase partial pages: addr=%u, blocklen=%u\n", __func__, addr, blocklen);
+		return 1;
+	}
+
+	if ((addr + blocklen) > total_size) {
+		msg_cerr("%s: tried to erase a sector beyond flash boundary: addr=%u, blocklen=%u, size=%u\n",
+			 __func__, addr, blocklen, total_size);
+		return 1;
+	}
+
+	/* Needs typically about 5 s for completion, so let's wait 20 seconds in 200 ms steps. */
+	return at45db_erase(flash, AT45DB_SECTOR_ERASE, at45db_convert_addr(addr, page_size), 200000, 100);
+}
+
+int spi_erase_at45db_chip(struct flashctx *flash, unsigned int addr, unsigned int blocklen)
+{
+	const unsigned int total_size = flash->chip->total_size * 1024;
+	
+	if ((addr + blocklen) > total_size) {
+		msg_cerr("%s: tried to erase beyond flash boundary: addr=%u, blocklen=%u, size=%u\n",
+			 __func__, addr, blocklen, total_size);
+		return 1;
+	}
+
+	/* Needs typically from about 5 to over 60 s for completion, so let's wait 100 s in 500 ms steps.
+	 * NB: the address is not a real address but a magic number. This hack allows to share code. */
+	return at45db_erase(flash, AT45DB_CHIP_ERASE, AT45DB_CHIP_ERASE_ADDR, 500000, 200);
+}
+
+static int at45db_fill_buffer1(struct flashctx *flash, uint8_t *bytes, unsigned int off, unsigned int len)
+{
+	const unsigned int page_size = flash->chip->page_size;
+	if ((off + len) > page_size) {
+		msg_cerr("Tried to write %u bytes at offset %u into a buffer of only %u B.\n",
+			 len, off, page_size);
+		return 1;
+	}
+
+	/* Create a suitable buffer to store opcode, address and data chunks for buffer1. */
+	const unsigned int max_data_write = flash->pgm->spi.max_data_write;
+	const unsigned int max_chunk = (max_data_write > 0 && max_data_write <= page_size) ?
+				       max_data_write : page_size;
+	uint8_t buf[4 + max_chunk];
+
+	buf[0] = AT45DB_BUFFER1_WRITE;
+	while (off < page_size) {
+		unsigned int cur_chunk = min(max_chunk, page_size - off);
+		buf[1] = (off >> 16) & 0xff;
+		buf[2] = (off >> 8) & 0xff;
+		buf[3] = (off >> 0) & 0xff;
+		memcpy(&buf[4], bytes + off, cur_chunk);
+		int ret = spi_send_command(flash, 4 + cur_chunk, 0, buf, NULL);
+		if (ret != 0) {
+			msg_cerr("%s: error sending buffer write!\n", __func__);
+			return ret;
+		}
+		off += cur_chunk;
+	}
+	return 0;
+}
+
+static int at45db_commit_buffer1(struct flashctx *flash, unsigned int at45db_addr)
+{
+	const uint8_t cmd[] = {
+		AT45DB_BUFFER1_PAGE_PROGRAM,
+		(at45db_addr >> 16) & 0xff,
+		(at45db_addr >> 8) & 0xff,
+		(at45db_addr >> 0) & 0xff
+	};
+
+	/* Send buffer to device. */
+	int ret = spi_send_command(flash, sizeof(cmd), 0, cmd, NULL);
+	if (ret != 0) {
+		msg_cerr("%s: error sending buffer to main memory command!\n", __func__);
+		return ret;
+	}
+
+	/* Wait for completion (typically a few ms). */
+	ret = at45db_wait_ready(flash, 250, 200); // 50 ms
+	if (ret != 0) {
+		msg_cerr("%s: chip did not became ready again!\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int at45db_program_page(struct flashctx *flash, uint8_t *buf, unsigned int at45db_addr)
+{
+	int ret = at45db_fill_buffer1(flash, buf, 0, flash->chip->page_size);
+	if (ret != 0) {
+		msg_cerr("%s: filling the buffer failed!\n", __func__);
+		return ret;
+	}
+
+	ret = at45db_commit_buffer1(flash, at45db_addr);
+	if (ret != 0) {
+		msg_cerr("%s: committing page failed!\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+int spi_write_at45db(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len)
+{
+	const unsigned int page_size = flash->chip->page_size;
+	const unsigned int total_size = flash->chip->total_size;
+	
+	if ((start % page_size) != 0 || (len % page_size) != 0) {
+		msg_cerr("%s: cannot write partial pages: start=%u, len=%u\n", __func__, start, len);
+		return 1;
+	}
+
+	if ((start + len) > (total_size * 1024)) {
+		msg_cerr("%s: tried to write beyond flash boundary: start=%u, len=%u, size=%u\n",
+			 __func__, start, len, total_size);
+		return 1;
+	}
+
+	unsigned int i;
+	for (i = 0; i < len; i += page_size) {
+		if (at45db_program_page(flash, buf + i, at45db_convert_addr(start + i, page_size)) != 0) {
+			msg_cerr("Writing page %u failed!\n", i);
+			return 1;
+		}
+	}
+	return 0;
+}
diff --git a/chipdrivers.h b/chipdrivers.h
index 091d14c..e669f00 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -64,6 +64,7 @@
 /* spi25_statusreg.c */
 uint8_t spi_read_status_register(struct flashctx *flash);
 int spi_write_status_register(struct flashctx *flash, int status);
+void spi_prettyprint_status_register_bit(uint8_t status, int bit);
 int spi_prettyprint_status_register_plain(struct flashctx *flash);
 int spi_prettyprint_status_register_default_welwip(struct flashctx *flash);
 int spi_prettyprint_status_register_default_bp1(struct flashctx *flash);
@@ -109,6 +110,17 @@
 int write_opaque(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
 int erase_opaque(struct flashctx *flash, unsigned int blockaddr, unsigned int blocklen);
 
+/* at45db.c */
+int probe_spi_at45db(struct flashctx *flash);
+int spi_prettyprint_status_register_at45db(struct flashctx *flash);
+int spi_disable_blockprotect_at45db(struct flashctx *flash);
+int spi_read_at45db(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
+int spi_write_at45db(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
+int spi_erase_at45db_page(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+int spi_erase_at45db_block(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+int spi_erase_at45db_sector(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+int spi_erase_at45db_chip(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
+
 /* 82802ab.c */
 uint8_t wait_82802ab(struct flashctx *flash);
 int probe_82802ab(struct flashctx *flash);
diff --git a/flashchips.c b/flashchips.c
index 9b331c7..527fb82 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -2337,14 +2337,39 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB011D,
-		.total_size	= 128 /* Size can only be determined from status register */,
-		.page_size	= 256 /* Size can only be determined from status register */,
+		.total_size	= 128 /* or 132, determined from status register */,
+		.page_size	= 256 /* or 264, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256, 512} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 256, 512/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 256, 1},
+					{120 * 256, 1},
+					{128 * 256, 3},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
 		.voltage	= {2700, 3600},
 	},
 
@@ -2354,14 +2379,39 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB021D,
-		.total_size	= 256 /* Size can only be determined from status register */,
-		.page_size	= 256 /* Size can only be determined from status register */,
+		.total_size	= 256 /* or 264, determined from status register */,
+		.page_size	= 256 /* or 264, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256, 1024} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 256, 1024/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 256, 1},
+					{120 * 256, 1},
+					{128 * 256, 7},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
 		.voltage	= {2700, 3600},
 	},
 
@@ -2371,15 +2421,40 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB041D,
-		.total_size	= 512 /* Size can only be determined from status register */,
-		.page_size	= 256 /* Size can only be determined from status register */,
+		.total_size	= 512 /* or 528, determined from status register */,
+		.page_size	= 256 /* or 264, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_OK_PREW,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
-		.voltage	= {2500, 3600}, /* 2.5-3.6V & 2.7-3.6V models available */
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256, 2048} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 256, 2048/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 256, 1},
+					{248 * 256, 1},
+					{256 * 256, 7},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
+		.voltage	= {2700, 3600}, /* 2.5-3.6V & 2.7-3.6V models available */
 	},
 
 	{
@@ -2388,14 +2463,39 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB081D,
-		.total_size	= 1024 /* Size can only be determined from status register */,
-		.page_size	= 256 /* Size can only be determined from status register */,
+		.total_size	= 1024 /* or 1056, determined from status register */,
+		.page_size	= 256 /* or 264, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256, 4096} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 256, 4096/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 256, 1},
+					{248 * 256, 1},
+					{256 * 256, 15},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
 		.voltage	= {2700, 3600}, /* 2.5-3.6V & 2.7-3.6V models available */
 	},
 
@@ -2405,14 +2505,39 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB161D,
-		.total_size	= 2048 /* Size can only be determined from status register */,
-		.page_size	= 512 /* Size can only be determined from status register */,
+		.total_size	= 2048 /* or 2112, determined from status register */,
+		.page_size	= 512 /* or 528, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_OK_PREW,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {512, 4096} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 512, 4096/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 512, 1},
+					{248 * 512, 1},
+					{256 * 512, 15},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {2048 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
 		.voltage	= {2700, 3600}, /* 2.5-3.6V & 2.7-3.6V models available */
 	},
 
@@ -2439,17 +2564,82 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB321D,
-		.total_size	= 4096 /* Size can only be determined from status register */,
-		.page_size	= 512 /* Size can only be determined from status register */,
-		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.total_size	= 4096 /* or 4224, determined from status register */,
+		.page_size	= 512 /* or 528, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
 		.feature_bits	= FEATURE_OTP,
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
-		.voltage	= {2700, 3600},
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {512, 8192} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 512, 8192/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 512, 1},
+					{120 * 512, 1},
+					{128 * 512, 63},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {4096 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
+		.voltage	= {2700, 3600}, /* 2.5-3.6V & 2.7-3.6V models available */
+	},
+
+	{
+		.vendor		= "Atmel",
+		.name		= "AT45DB321E",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= ATMEL_ID,
+		.model_id	= ATMEL_AT45DB321C,
+		.total_size	= 4096 /* or 4224, determined from status register */,
+		.page_size	= 512 /* or 528, determined from status register */,
+		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_at45db,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {512, 8192} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 512, 8192/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 512, 1},
+					{120 * 512, 1},
+					{128 * 512, 63},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {4096 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db, /* has a 2nd status register */
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
+		.voltage	= {2500, 3600}, /* 2.3-3.6V & 2.5-3.6V models available */
 	},
 
 	{
@@ -2458,14 +2648,39 @@
 		.bustype	= BUS_SPI,
 		.manufacture_id	= ATMEL_ID,
 		.model_id	= ATMEL_AT45DB642D,
-		.total_size	= 8192 /* Size can only be determined from status register */,
-		.page_size	= 1024 /* Size can only be determined from status register */,
+		.total_size	= 8192 /* or 8448, determined from status register */,
+		.page_size	= 1024 /* or 1056, determined from status register */,
 		/* does not support EWSR nor WREN and has no writable status register bits whatsoever */
-		.tested		= TEST_BAD_REW,
-		.probe		= probe_spi_rdid,
+		/* OTP: 128B total, 64B pre-programmed; read 0x77; write 0x9B */
+		.feature_bits	= FEATURE_OTP,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_spi_at45db,
 		.probe_timing	= TIMING_ZERO,
-		.write		= NULL,
-		.read		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {1024, 8192} },
+				.block_erase = spi_erase_at45db_page,
+			}, {
+				.eraseblocks = { {8 * 1024, 8192/8} },
+				.block_erase = spi_erase_at45db_block,
+			}, {
+				.eraseblocks = {
+					{8 * 1024, 1},
+					{248 * 1024, 1},
+					{256 * 1024, 31},
+				},
+				.block_erase = spi_erase_at45db_sector
+			}, {
+				.eraseblocks = { {8192 * 1024, 1} },
+				.block_erase = spi_erase_at45db_chip,
+			}
+		},
+		.unlock		= spi_disable_blockprotect_at45db, /* Impossible if locked down or #WP is low */
+		.printlock	= spi_prettyprint_status_register_at45db,
+		/* granularity will be set by the probing function. */
+		.write		= spi_write_at45db,
+		.read		= spi_read_at45db, /* Fast read (0x0B) supported */
 		.voltage	= {2700, 3600},
 	},
 
diff --git a/flashchips.h b/flashchips.h
index a876f25..429cd31 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -167,24 +167,25 @@
 #define ATMEL_AT45D041A		/* No ID available */
 #define ATMEL_AT45D081A		/* No ID available */
 #define ATMEL_AT45D161		/* No ID available */
-#define ATMEL_AT45DB011		/* No ID available */
-#define ATMEL_AT45DB011B	/* No ID available */
+#define ATMEL_AT45DB011		/* No ID (opcode) available for AT45DB011, AT45DB011B */
 #define ATMEL_AT45DB011D	0x2200
-#define ATMEL_AT45DB021A	/* No ID available */
-#define ATMEL_AT45DB021B	/* No ID available */
+#define ATMEL_AT45DB021		/* No ID (opcode) available for AT45DB021, AT45DB021A, AT45DB021B */
 #define ATMEL_AT45DB021D	0x2300
-#define ATMEL_AT45DB041A	/* No ID available */
+#define ATMEL_AT45DB021E	/* same as above but with EDI 0x0100 */
+#define ATMEL_AT45DB041		/* No ID (opcode) available for AT45DB041, AT45DB041A, AT45DB041B */
 #define ATMEL_AT45DB041D	0x2400
-#define ATMEL_AT45DB081A	/* No ID available */
+#define ATMEL_AT45DB041E	/* same as above but with EDI 0x0100 */
+#define ATMEL_AT45DB081		/* No ID (opcode) available for AT45DB081, AT45DB081A, AT45DB081B */
 #define ATMEL_AT45DB081D	0x2500
-#define ATMEL_AT45DB161		/* No ID available */
-#define ATMEL_AT45DB161B	/* No ID available */
+#define ATMEL_AT45DB081E	/* same as above but with EDI 0x0100 */
+#define ATMEL_AT45DB161		/* No ID (opcode) available for AT45DB161, AT45DB161B */
 #define ATMEL_AT45DB161D	0x2600
-#define ATMEL_AT45DB321		/* No ID available */
-#define ATMEL_AT45DB321B	/* No ID available */
+#define ATMEL_AT45DB161E	/* same as above but with EDI 0x0100 */
+#define ATMEL_AT45DB321		/* No ID (opcode) available for AT45DB321, AT45DB321B */
 #define ATMEL_AT45DB321C	0x2700
+#define ATMEL_AT45DB321E	/* same as above but with EDI 0x0100 */
 #define ATMEL_AT45DB321D	0x2701 /* Buggy data sheet */
-#define ATMEL_AT45DB642		/* No ID available */
+#define ATMEL_AT45DB642		/* No ID (opcode) available for AT45DB642 */
 #define ATMEL_AT45DB642D	0x2800
 #define ATMEL_AT49BV512		0x03
 #define ATMEL_AT49F002N		0x07	/* for AT49F002(N)  */
diff --git a/serprog.c b/serprog.c
index 4938d4b..237db7d 100644
--- a/serprog.c
+++ b/serprog.c
@@ -922,8 +922,7 @@
 /* FIXME: This function is optimized so that it does not split each transaction
  * into chip page_size long blocks unnecessarily like spi_read_chunked. This has
  * the advantage that it is much faster for most chips, but breaks those with
- * non-contiguous address space (like AT45DB161D). When spi_read_chunked is
- * fixed this method can be removed. */
+ * non-continuous reads. When spi_read_chunked is fixed this method can be removed. */
 static int serprog_spi_read(struct flashctx *flash, uint8_t *buf,
 			    unsigned int start, unsigned int len)
 {
diff --git a/spi25_statusreg.c b/spi25_statusreg.c
index 8fb7f2d..48fceb0 100644
--- a/spi25_statusreg.c
+++ b/spi25_statusreg.c
@@ -270,7 +270,7 @@
 }
 
 /* Unnamed bits. */
-static void spi_prettyprint_status_register_bit(uint8_t status, int bit)
+void spi_prettyprint_status_register_bit(uint8_t status, int bit)
 {
 	msg_cdbg("Chip status register: Bit %i is %sset\n", bit, (status & (1 << bit)) ? "" : "not ");
 }