Replaced non-working (on NAS100d) redboot byteswap partition truncate patch with the one that has been tested on NSLU2, NAS100d, Loft, etc., accepted by linux-mtd, and should be in 2.6.20

SVN-Revision: 5813

target/linux/generic-2.6/patches/050-mtdpart-redboot-partition-truncate.patch

@@ -0,0 +1,61 @@
+Redboot supports storing the FIS directory and the RedBoot
+configuration information in the same block of flash memory.  This is
+not the most common RedBoot configuration, but it is used on
+commercially available boards supported by the kernel.
+
+A recent patch to mtd/redboot.c (http://lkml.org/lkml/2006/3/20/410)
+which corrected the skipping of deleted table entries has exposed the
+latent problem of the kernel redboot parser running off the end of the
+FIS directory and interpreting the RedBoot configuration information
+as table entries.
+
+This patch terminates the table parsing when the first truly empty
+entry is found (table entry deletion only clears the first byte of the
+name, so two cleared bytes in a row indicates the end of the table),
+thereby supporting the combined redboot FIS directory and RedBoot
+configuration information flash layout scenario.
+
+Signed-off-by: Rod Whitby <rod@whitby.id.au>
+--
+
+Index: linux-2.6.19/drivers/mtd/redboot.c
+===================================================================
+--- linux-2.6.19.orig/drivers/mtd/redboot.c
++++ linux-2.6.19/drivers/mtd/redboot.c
+@@ -96,7 +96,19 @@ static int parse_redboot_partitions(stru
+ 			 */
+ 			if (swab32(buf[i].size) == master->erasesize) {
+ 				int j;
+-				for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
++				for (j = 0; j < numslots; ++j) {
++
++					/* A single 0xff denotes a deleted entry.
++					 * Two of them in a row is the end of the table.
++					 */
++					if (buf[j].name[0] == 0xff) {
++				  		if (buf[j].name[1] == 0xff) {
++							break;
++						} else {
++							continue;
++						}
++					}
++
+ 					/* The unsigned long fields were written with the
+ 					 * wrong byte sex, name and pad have no byte sex.
+ 					 */
+@@ -123,8 +135,13 @@ static int parse_redboot_partitions(stru
+ 	for (i = 0; i < numslots; i++) {
+ 		struct fis_list *new_fl, **prev;
+ 
+-		if (buf[i].name[0] == 0xff)
+-			continue;
++		if (buf[i].name[0] == 0xff) {
++			if (buf[i].name[1] == 0xff) {
++				break;
++			} else {
++				continue;
++			}
++		}
+ 		if (!redboot_checksum(&buf[i]))
+ 			break;
+ 

target/linux/generic-2.6/patches/050-mtdpart_redboot_byteswap_partition_truncate.patch

@@ -1,61 +0,0 @@
-diff -urN linux-2.6.19.old/drivers/mtd/redboot.c linux-2.6.19.dev/drivers/mtd/redboot.c
---- linux-2.6.19.old/drivers/mtd/redboot.c	2006-11-29 22:57:37.000000000 +0100
-+++ linux-2.6.19.dev/drivers/mtd/redboot.c	2006-12-14 03:13:35.000000000 +0100
-@@ -92,22 +92,47 @@
- 			 * swab32(erasesize) then we know we are looking at
- 			 * a byte swapped FIS directory - swap all the entries!
- 			 * (NOTE: this is 'size' not 'data_length'; size is
--			 * the full size of the entry.)
-+			 * the full size of the entry.) 
-+			 *
-+			 * Handle cases where the FIS directory is less than
-+			 * a full erase block (like combine FIS directory
-+			 * and RedBoot config).
-+			 *
-+			 * IMHO the best solution would be to compute the
-+			 * flash address of the RedBoot FIS directory and
-+			 * compare that with the entry in the FIS directory
-+			 * entry swabbed.  However, I haven't yet figured out
-+			 * how to compute that.
- 			 */
--			if (swab32(buf[i].size) == master->erasesize) {
-+
-+			unsigned long erasesize_mask = master->erasesize -1;
-+			unsigned long eraseaddr_mask = 0xFFFFFFFF ^ erasesize_mask;
-+			
-+			if (((swab32(buf[i].size)+erasesize_mask) 
-+				& eraseaddr_mask) == master->erasesize) {
- 				int j;
--				for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
-+
-+				/* N.B. The full table being processed so adjust size now */
-+				numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc);
-+				for (j = 0; j < numslots; ++j) {
- 					/* The unsigned long fields were written with the
- 					 * wrong byte sex, name and pad have no byte sex.
-+					 *
-+					 * Only process non-deleted entries. Don't exit early.
- 					 */
--					swab32s(&buf[j].flash_base);
--					swab32s(&buf[j].mem_base);
--					swab32s(&buf[j].size);
--					swab32s(&buf[j].entry_point);
--					swab32s(&buf[j].data_length);
--					swab32s(&buf[j].desc_cksum);
--					swab32s(&buf[j].file_cksum);
-+					if (buf[j].name[0] != 0xff) {
-+						swab32s(&buf[j].flash_base);
-+						swab32s(&buf[j].mem_base);
-+						swab32s(&buf[j].size);
-+						swab32s(&buf[j].entry_point);
-+						swab32s(&buf[j].data_length);
-+						swab32s(&buf[j].desc_cksum);
-+						swab32s(&buf[j].file_cksum);
-+					}
- 				}
-+			} else {
-+				/* Update numslots based on actual FIS directory size */
-+				numslots = buf[i].size / sizeof (struct fis_image_desc);
- 			}
- 			break;
- 		}