diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index ed3e398..9bced29 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -13,6 +13,8 @@
 #include <mapmem.h>
 #include <spi.h>
 #include <spi_flash.h>
+#include <jffs2/jffs2.h>
+#include <linux/mtd/mtd.h>
 
 #include <asm/io.h>
 #include <dm/device-internal.h>
@@ -254,23 +256,21 @@ static int spi_flash_update(struct spi_flash *flash, u32 offset,
 static int do_spi_flash_read_write(int argc, char * const argv[])
 {
 	unsigned long addr;
-	unsigned long offset;
-	unsigned long len;
 	void *buf;
 	char *endp;
 	int ret = 1;
+	int dev = 0;
+	loff_t offset, len, maxsize;
 
-	if (argc < 4)
+	if (argc < 3)
 		return -1;
 
 	addr = simple_strtoul(argv[1], &endp, 16);
 	if (*argv[1] == 0 || *endp != 0)
 		return -1;
-	offset = simple_strtoul(argv[2], &endp, 16);
-	if (*argv[2] == 0 || *endp != 0)
-		return -1;
-	len = simple_strtoul(argv[3], &endp, 16);
-	if (*argv[3] == 0 || *endp != 0)
+
+	if (mtd_arg_off_size(argc - 2, &argv[2], &dev, &offset, &len,
+			     &maxsize, MTD_DEV_TYPE_NOR, flash->size))
 		return -1;
 
 	/* Consistency checking */
@@ -309,31 +309,31 @@ static int do_spi_flash_read_write(int argc, char * const argv[])
 
 static int do_spi_flash_erase(int argc, char * const argv[])
 {
-	unsigned long offset;
-	unsigned long len;
-	char *endp;
 	int ret;
+	int dev = 0;
+	loff_t offset, len, maxsize;
+	ulong size;
 
 	if (argc < 3)
 		return -1;
 
-	offset = simple_strtoul(argv[1], &endp, 16);
-	if (*argv[1] == 0 || *endp != 0)
+	if (mtd_arg_off(argv[1], &dev, &offset, &len, &maxsize,
+			MTD_DEV_TYPE_NOR, flash->size))
 		return -1;
 
-	ret = sf_parse_len_arg(argv[2], &len);
+	ret = sf_parse_len_arg(argv[2], &size);
 	if (ret != 1)
 		return -1;
 
 	/* Consistency checking */
-	if (offset + len > flash->size) {
+	if (offset + size > flash->size) {
 		printf("ERROR: attempting %s past flash size (%#x)\n",
 		       argv[0], flash->size);
 		return 1;
 	}
 
-	ret = spi_flash_erase(flash, offset, len);
-	printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
+	ret = spi_flash_erase(flash, offset, size);
+	printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)size, (u32)offset,
 	       ret ? "ERROR" : "OK");
 
 	return ret == 0 ? 0 : 1;
@@ -558,13 +558,17 @@ U_BOOT_CMD(
 	"SPI flash sub-system",
 	"probe [[bus:]cs] [hz] [mode]	- init flash device on given SPI bus\n"
 	"				  and chip select\n"
-	"sf read addr offset len	- read `len' bytes starting at\n"
-	"				  `offset' to memory at `addr'\n"
-	"sf write addr offset len	- write `len' bytes from memory\n"
-	"				  at `addr' to flash at `offset'\n"
-	"sf erase offset [+]len		- erase `len' bytes from `offset'\n"
-	"				  `+len' round up `len' to block size\n"
-	"sf update addr offset len	- erase and write `len' bytes from memory\n"
-	"				  at `addr' to flash at `offset'"
+	"sf read addr offset|partition len	- read `len' bytes starting at\n"
+	"				          `offset' or from start of mtd\n"
+	"					  `partition'to memory at `addr'\n"
+	"sf write addr offset|partition len	- write `len' bytes from memory\n"
+	"				          at `addr' to flash at `offset'\n"
+	"					  or to start of mtd `partition'\n"
+	"sf erase offset|partition [+]len	- erase `len' bytes from `offset'\n"
+	"					  or from start of mtd `partition'\n"
+	"					 `+len' round up `len' to block size\n"
+	"sf update addr offset|partition len	- erase and write `len' bytes from memory\n"
+	"					  at `addr' to flash at `offset'\n"
+	"					  or to start of mtd `partition'\n"
 	SF_TEST_HELP
 );