diff --git a/Makefile b/Makefile
index 21fa8b0..7377c71 100644
--- a/Makefile
+++ b/Makefile
@@ -227,6 +227,11 @@
 else
 override CONFIG_ATAVIA = no
 endif
+ifeq ($(CONFIG_ATAPROMISE), yes)
+UNSUPPORTED_FEATURES += CONFIG_ATAPROMISE=yes
+else
+override CONFIG_ATAPROMISE = no
+endif
 ifeq ($(CONFIG_IT8212), yes)
 UNSUPPORTED_FEATURES += CONFIG_IT8212=yes
 else
@@ -449,6 +454,9 @@
 # VIA VT6421A LPC memory support
 CONFIG_ATAVIA ?= yes
 
+# Promise ATA controller support.
+CONFIG_ATAPROMISE ?= no
+
 # Always enable FT2232 SPI dongles for now.
 CONFIG_FT2232_SPI ?= yes
 
@@ -626,6 +634,12 @@
 NEED_PCI := yes
 endif
 
+ifeq ($(CONFIG_ATAPROMISE), yes)
+FEATURE_CFLAGS += -D'CONFIG_ATAPROMISE=1'
+PROGRAMMER_OBJS += atapromise.o
+NEED_PCI := yes
+endif
+
 ifeq ($(CONFIG_IT8212), yes)
 FEATURE_CFLAGS += -D'CONFIG_IT8212=1'
 PROGRAMMER_OBJS += it8212.o
diff --git a/atapromise.c b/atapromise.c
new file mode 100644
index 0000000..d44ff0d
--- /dev/null
+++ b/atapromise.c
@@ -0,0 +1,177 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2015 Joseph C. Lehner <joseph.c.lehner@gmail.com>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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
+ */
+
+#if defined(__i386__) || defined(__x86_64__)
+
+#include <string.h>
+#include <stdlib.h>
+#include "flash.h"
+#include "programmer.h"
+#include "hwaccess.h"
+
+#define MAX_ROM_DECODE (32 * 1024)
+#define ADDR_MASK (MAX_ROM_DECODE - 1)
+
+/*
+ * In the absence of any public docs on the PDC2026x family, this programmer was created through a mix of
+ * reverse-engineering and trial and error.
+ *
+ * The only device tested is an Ultra100 controller, but the logic for programming the other 2026x controllers
+ * is the same, so it should, in theory, work for those as well.
+ *
+ * While the tested Ultra100 controller used a 128 kB MX29F001T chip, A16 and A15 showed continuity to ground,
+ * thus limiting the the programmer on this card to 32 kB. Without other controllers to test this programmer on,
+ * this is currently a hard limit. Note that ROM files for these controllers are 16 kB only.
+ *
+ * Since flashrom does not support accessing flash chips larger than the size limit of the programmer (the
+ * tested Ultra100 uses a 128 kB MX29F001T chip), the chip size is hackishly adjusted in atapromise_limit_chip.
+ */
+
+static uint32_t io_base_addr = 0;
+static uint32_t rom_base_addr = 0;
+
+static uint8_t *atapromise_bar = NULL;
+static size_t rom_size = 0;
+
+const struct dev_entry ata_promise[] = {
+	{0x105a, 0x4d38, NT, "Promise", "PDC20262 (FastTrak66/Ultra66)"},
+	{0x105a, 0x0d30, NT, "Promise", "PDC20265 (FastTrak100 Lite/Ultra100)"},
+	{0x105a, 0x4d30, OK, "Promise", "PDC20267 (FastTrak100/Ultra100)"},
+	{0},
+};
+
+static void atapromise_chip_writeb(const struct flashctx *flash, uint8_t val, chipaddr addr);
+static uint8_t atapromise_chip_readb(const struct flashctx *flash, const chipaddr addr);
+
+static const struct par_master par_master_atapromise = {
+		.chip_readb		= atapromise_chip_readb,
+		.chip_readw		= fallback_chip_readw,
+		.chip_readl		= fallback_chip_readl,
+		.chip_readn		= fallback_chip_readn,
+		.chip_writeb		= atapromise_chip_writeb,
+		.chip_writew		= fallback_chip_writew,
+		.chip_writel		= fallback_chip_writel,
+		.chip_writen		= fallback_chip_writen,
+};
+
+void *atapromise_map(const char *descr, uintptr_t phys_addr, size_t len)
+{
+	/* In case fallback_map ever returns something other than NULL. */
+	return NULL;
+}
+
+static void atapromise_limit_chip(struct flashchip *chip)
+{
+	static uint32_t last_model_id = 0;
+	unsigned int i, size;
+
+	if (chip->model_id == last_model_id)
+		return;
+
+	size = chip->total_size * 1024;
+	if (size > rom_size) {
+		/* Undefine all block_erasers that don't operate on the whole chip,
+		 * and adjust the eraseblock size of the one that does.
+		 */
+		for (i = 0; i < NUM_ERASEFUNCTIONS; ++i) {
+			if (chip->block_erasers[i].eraseblocks[0].size != size) {
+				chip->block_erasers[i].eraseblocks[0].count = 0;
+				chip->block_erasers[i].block_erase = NULL;
+			} else {
+				chip->block_erasers[i].eraseblocks[0].size = rom_size;
+				break;
+			}
+		}
+
+		if (i != NUM_ERASEFUNCTIONS) {
+			chip->total_size = rom_size / 1024;
+			if (chip->page_size > rom_size)
+				chip->page_size = rom_size;
+		} else {
+			msg_pdbg("Failed to adjust size of chip \"%s\" (%d kB).\n", chip->name,
+				 chip->total_size);
+		}
+	}
+
+	last_model_id = chip->model_id;
+}
+
+int atapromise_init(void)
+{
+	struct pci_dev *dev = NULL;
+
+	if (rget_io_perms())
+		return 1;
+
+	dev = pcidev_init(ata_promise, PCI_BASE_ADDRESS_4);
+	if (!dev)
+		return 1;
+
+	io_base_addr = pcidev_readbar(dev, PCI_BASE_ADDRESS_4) & 0xfffe;
+	if (!io_base_addr) {
+		return 1;
+	}
+
+	/* Not exactly sure what this does, because flashing seems to work
+	 * well without it. However, PTIFLASH does it, so we do it too.
+	 */
+	OUTB(1, io_base_addr + 0x10);
+
+	rom_base_addr = pcidev_readbar(dev, PCI_BASE_ADDRESS_5);
+	if (!rom_base_addr) {
+		msg_pdbg("Failed to read BAR5\n");
+		return 1;
+	}
+
+	rom_size = dev->rom_size > MAX_ROM_DECODE ? MAX_ROM_DECODE : dev->rom_size;
+	atapromise_bar = (uint8_t*)rphysmap("Promise", rom_base_addr, rom_size);
+	if (atapromise_bar == ERROR_PTR) {
+		return 1;
+	}
+
+	max_rom_decode.parallel = rom_size;
+	register_par_master(&par_master_atapromise, BUS_PARALLEL);
+
+	msg_pwarn("Do not use this device as a generic programmer. It will leave anything outside\n"
+		  "the first %zu kB of the flash chip in an undefined state. It works fine for the\n"
+		  "purpose of updating the firmware of this device (padding may neccessary).\n",
+		  rom_size / 1024);
+
+	return 0;
+}
+
+static void atapromise_chip_writeb(const struct flashctx *flash, uint8_t val, chipaddr addr)
+{
+	uint32_t data;
+
+	atapromise_limit_chip(flash->chip);
+	data = (rom_base_addr + (addr & ADDR_MASK)) << 8 | val;
+	OUTL(data, io_base_addr + 0x14);
+}
+
+static uint8_t atapromise_chip_readb(const struct flashctx *flash, const chipaddr addr)
+{
+	atapromise_limit_chip(flash->chip);
+	return pci_mmio_readb(atapromise_bar + (addr & ADDR_MASK));
+}
+
+#else
+#error PCI port I/O access is not supported on this architecture yet.
+#endif
diff --git a/flashrom.8.tmpl b/flashrom.8.tmpl
index 517c00e..5b6e63c 100644
--- a/flashrom.8.tmpl
+++ b/flashrom.8.tmpl
@@ -233,6 +233,8 @@
 .sp
 .BR "* atavia" " (for flash ROMs on VIA VT6421A SATA controllers)"
 .sp
+.BR "* atapromise" " (for flash ROMs on Promise PDC2026x ATA/RAID controllers)"
+.sp
 .BR "* it8212" " (for flash ROMs on ITE IT8212F ATA/RAID controller)"
 .sp
 .BR "* ft2232_spi" " (for SPI flash ROMs attached to an FT2232/FT4232H/FT232H family \
@@ -636,7 +638,7 @@
 .SS
 .BR "nic3com" , " nicrealtek" , " nicnatsemi" , " nicintel", " nicintel_eeprom"\
 , " nicintel_spi" , " gfxnvidia" , " ogp_spi" , " drkaiser" , " satasii"\
-, " satamv" , " atahpt", " atavia " and " it8212 " programmers
+, " satamv" , " atahpt", " atavia ", " atapromise " and " it8212 " programmers
 .IP
 These programmers have an option to specify the PCI address of the card
 your want to use, which must be specified if more than one card supported
@@ -669,6 +671,13 @@
 For more information please see
 .URLB https://flashrom.org/VT6421A "its wiki page" .
 .SS
+.BR "atapromise " programmer
+.IP
+This programmer is currently limited to 32 kB, regardless of the actual size of the flash chip. This stems
+from the fact that, on the tested device (a Promise Ultra100), not all of the chip's address lines were
+actually connected. You may use this programmer to flash firmware updates, since these are only 16 kB in
+size (padding to 32 kB is required).
+.SS
 .BR "nicintel_eeprom " programmer
 .IP
 This is the first programmer module in flashrom that does not provide access to NOR flash chips but EEPROMs
@@ -1059,8 +1068,8 @@
 .BR satasii ", " nicintel ", " nicintel_eeprom " and " nicintel_spi
 need PCI configuration space read access and raw memory access.
 .sp
-.B satamv
-needs PCI configuration space read access, raw I/O port access and raw memory
+.BR satamv " and " atapromise
+need PCI configuration space read access, raw I/O port access and raw memory
 access.
 .sp
 .B serprog
@@ -1076,7 +1085,7 @@
 needs no access permissions at all.
 .sp
 .BR internal ", " nic3com ", " nicrealtek ", " nicnatsemi ", "
-.BR gfxnvidia ", " drkaiser ", " satasii ", " satamv ", " atahpt" and " atavia
+.BR gfxnvidia ", " drkaiser ", " satasii ", " satamv ", " atahpt ", " atavia " and " atapromise
 have to be run as superuser/root, and need additional raw access permission.
 .sp
 .BR serprog ", " buspirate_spi ", " dediprog ", " usbblaster_spi ", " ft2232_spi " and " pickit2_spi
diff --git a/flashrom.c b/flashrom.c
index 3853e19..35bcd8a 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -182,6 +182,18 @@
 	},
 #endif
 
+#if CONFIG_ATAPROMISE == 1
+	{
+		.name			= "atapromise",
+		.type			= PCI,
+		.devs.dev		= ata_promise,
+		.init			= atapromise_init,
+		.map_flash_region	= atapromise_map,
+		.unmap_flash_region	= fallback_unmap,
+		.delay			= internal_delay,
+	},
+#endif
+
 #if CONFIG_IT8212 == 1
 	{
 		.name			= "it8212",
diff --git a/programmer.h b/programmer.h
index 97f0ffa..ff7cf5f 100644
--- a/programmer.h
+++ b/programmer.h
@@ -57,6 +57,9 @@
 #if CONFIG_ATAVIA == 1
 	PROGRAMMER_ATAVIA,
 #endif
+#if CONFIG_ATAPROMISE == 1
+	PROGRAMMER_ATAPROMISE,
+#endif
 #if CONFIG_IT8212 == 1
 	PROGRAMMER_IT8212,
 #endif
@@ -460,6 +463,13 @@
 extern const struct dev_entry ata_via[];
 #endif
 
+/* atapromise.c */
+#if CONFIG_ATAPROMISE == 1
+int atapromise_init(void);
+void *atapromise_map(const char *descr, uintptr_t phys_addr, size_t len);
+extern const struct dev_entry ata_promise[];
+#endif
+
 /* it8212.c */
 #if CONFIG_IT8212 == 1
 int it8212_init(void);