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

   1 --- linux-2.6.18/drivers/mtd/redboot.c.orig     2006-10-23 11:41:56.000000000 -0400
   2 +++ linux-2.6.18/drivers/mtd/redboot.c  2006-10-23 11:42:09.000000000 -0400
   3 @@ -92,22 +92,47 @@
   4                          * swab32(erasesize) then we know we are looking at
   5                          * a byte swapped FIS directory - swap all the entries!
   6                          * (NOTE: this is 'size' not 'data_length'; size is
   7 -                        * the full size of the entry.)
   8 +                        * the full size of the entry.)
   9 +                        *
  10 +                        * Handle cases where the FIS directory is less than
  11 +                        * a full erase block (like combine FIS directory
  12 +                        * and RedBoot config).
  13 +                        *
  14 +                        * IMHO the best solution would be to compute the
  15 +                        * flash address of the RedBoot FIS directory and
  16 +                        * compare that with the entry in the FIS directory
  17 +                        * entry swabbed.  However, I haven't yet figured out
  18 +                        * how to compute that.
  19                          */
  20 -                       if (swab32(buf[i].size) == master->erasesize) {
  21 +
  22 +                       unsigned long erasesize_mask = master->erasesize -1;
  23 +                       unsigned long eraseaddr_mask = 0xFFFFFFFF ^ erasesize_mask;
  24 +
  25 +                       if (((swab32(buf[i].size)+erasesize_mask)
  26 +                               & eraseaddr_mask) == master->erasesize) {
  27                                 int j;
  28 -                               for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
  29 +
  30 +                               /* N.B. The full table being processed so adjust size now */
  31 +                               numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc);
  32 +                               for (j = 0; j < numslots; ++j) {
  33                                         /* The unsigned long fields were written with the
  34                                          * wrong byte sex, name and pad have no byte sex.
  35 -                                        */
  36 -                                       swab32s(&buf[j].flash_base);
  37 -                                       swab32s(&buf[j].mem_base);
  38 -                                       swab32s(&buf[j].size);
  39 -                                       swab32s(&buf[j].entry_point);
  40 -                                       swab32s(&buf[j].data_length);
  41 -                                       swab32s(&buf[j].desc_cksum);
  42 -                                       swab32s(&buf[j].file_cksum);
  43 +                                        *
  44 +                                        * Only process non-deleted entries. Don't exit early.
  45 +                                        */
  46 +                                       if (buf[j].name[0] != 0xff) {
  47 +                                               swab32s(&buf[j].flash_base);
  48 +                                               swab32s(&buf[j].mem_base);
  49 +                                               swab32s(&buf[j].size);
  50 +                                               swab32s(&buf[j].entry_point);
  51 +                                               swab32s(&buf[j].data_length);
  52 +                                               swab32s(&buf[j].desc_cksum);
  53 +                                               swab32s(&buf[j].file_cksum);
  54 +                                       }
  55                                 }
  56 +                       } else {
  57 +                               /* Update numslots based on actual FIS directory size */
  58 +                               numslots = buf[i].size / sizeof (struct fis_image_desc);
  59                         }
  60                         break;
  61                 }