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On IXP4XX systems the FIS directory is big endian even with a little
endian kernel. This patch recognises the FIS directory on such a
system and byte swaps it to obtain a valid table based on the 'size'
field of the FIS directory (the size field is know to always match the
erase block size on such systems, and probably all systems.)
--- linux-2.6.13/.pc/10-mtdpart-redboot-fis-byteswap.patch/drivers/mtd/redboot.c 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/drivers/mtd/redboot.c 2005-10-23 21:44:59.999694674 -0700
@@ -89,8 +89,34 @@
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.
+ */
+# define do_swab32(x) (x) = swab32(x)
+ do_swab32(buf[j].flash_base);
+ do_swab32(buf[j].mem_base);
+ do_swab32(buf[j].size);
+ do_swab32(buf[j].entry_point);
+ do_swab32(buf[j].data_length);
+ do_swab32(buf[j].desc_cksum);
+ do_swab32(buf[j].file_cksum);
+# undef do_swab32
+ }
+ }
break;
+ }
}
if (i == numslots) {
/* Didn't find it */
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