nslu2-kernel: Moved to obsolete - replaced long ago by ixp4xx-kernel.

1 files changed, 70 insertions, 0 deletions

diff --git a/packages/obsolete/nslu2/nslu2-kernel/2.6.15/10-mtdpart-redboot-fis-byteswap.patch b/packages/obsolete/nslu2/nslu2-kernel/2.6.15/10-mtdpart-redboot-fis-byteswap.patch
new file mode 100644
index 0000000000..3fa0535abf
--- /dev/null
+++ b/packages/obsolete/nslu2/nslu2-kernel/2.6.15/10-mtdpart-redboot-fis-byteswap.patch
@@ -0,0 +1,70 @@
+drivers/mtd/redboot.c: recognise a foreign byte sex partition table
+
+The RedBoot boot loader writes flash partition tables containing native
+byte sex 32 bit values.  When booting an opposite byte sex kernel (e.g.  an
+LE kernel from BE RedBoot) the current MTD driver fails to handle the
+partition table and therefore is unable to generate the correct partition
+map for the flash.
+
+The patch recognises that the FIS directory (the partition table) is
+byte-reversed by examining the partition table size, which is known to be
+one erase block (this is an assumption made elsewhere in redboot.c).  If
+the size matches the erase block after byte swapping the value then
+byte-reversal is assumed, if not no further action is taken.  The patched
+code is fail safe; should redboot.c be changed to support a partition table
+with a modified size field the test will fail and the partition table will
+be assumed to have the host byte sex.
+
+If byte-reversal is detected the patch byte swaps the remainder of the 32
+bit fields in the copy of the table; this copy is then used to set up the
+MTD partition map.
+
+Signed-off-by: John Bowler <jbowler@acm.org>
+Signed-off-by: Andrew Morton <akpm@osdl.org>
+Modified slightly and
+Signed-off-by: David Woodhouse <dwmw2@infradead.org>
+
+Index: drivers/mtd/redboot.c
+===================================================================
+RCS file: /home/cvs/mtd/drivers/mtd/redboot.c,v
+retrieving revision 1.18
+retrieving revision 1.19
+diff -u -p -r1.18 -r1.19
+--- linux-2.6.15/drivers/mtd/redboot.c	1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.15/drivers/mtd/redboot.c	1970-01-01 00:00:00.000000000 +0000
+@@ -89,8 +89,32 @@ static int parse_redboot_partitions(stru
+ 			i = numslots;
+ 			break;
+ 		}
+-		if (!memcmp(buf[i].name, "FIS directory", 14))
++		if (!memcmp(buf[i].name, "FIS directory", 14)) {
++			/* This is apparently the FIS directory entry for the
++			 * FIS directory itself.  The FIS directory size is
++			 * one erase block; if the buf[i].size field is
++			 * 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.)
++			 */
++			if (swab32(buf[i].size) == master->erasesize) {
++				int j;
++				for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
++					/* The unsigned long fields were written with the
++					 * wrong byte sex, name and pad have no byte sex.
++					 */
++					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);
++				}
++			}
+ 			break;
++		}
+ 	}
+ 	if (i == numslots) {
+ 		/* Didn't find it */
+
+