mtd - remove partition table assumption when writing fis table

When mtd alters the fis partition table it assumes that the first partition
table entry also is the first logical parition table entry. For instance our
table could look like this (irrelevant partitions put aside):
 * vmlinux.bin.l7 0xA8710000
 * rootfs         0xA8030000
Here mtd would assume vmlinux.bin.l7 being the first partition and use its
address to calculate the size and offset which ultimately leads to a broken
partition table.
This patch alters the behavior by checking what partition has the smaller
address to do the calculations based on that address.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
SVN-Revision: 32601

diff --git a/package/mtd/src/fis.c b/package/mtd/src/fis.c
index 559ca95069a510cd6f76e66ca0d5cfafe3cb4a6f..f825f590c96a50141849d24c63b9d652ab146808 100644 (file)
--- a/package/mtd/src/fis.c
+++ b/package/mtd/src/fis.c
@@ -143,6 +143,8 @@ fis_remap(struct fis_part *old, int n_old, struct fis_part *new, int n_new)
        struct fis_image_desc *redboot = NULL;
        struct fis_image_desc *first = NULL;
        struct fis_image_desc *last = NULL;
+       struct fis_image_desc *first_fb = NULL;
+       struct fis_image_desc *last_fb = NULL;
        struct fis_image_desc *desc;
        struct fis_part *part;
        uint32_t offset = 0, size = 0;
@@ -184,13 +186,21 @@ fis_remap(struct fis_part *old, int n_old, struct fis_part *new, int n_new)
        }
        desc--;
 
+       first_fb = first;
+       last_fb = last;
+
+       if (first_fb->hdr.flash_base > last_fb->hdr.flash_base) {
+               first_fb = last;
+               last_fb = first;
+       }
+
        /* determine size of available space */
        desc = (struct fis_image_desc *) start;
        while ((char *) desc < end) {
                if (!desc->hdr.name[0] || (desc->hdr.name[0] == 0xff))
                        break;
 
-               if (desc->hdr.flash_base > last->hdr.flash_base &&
+               if (desc->hdr.flash_base > last_fb->hdr.flash_base &&
                    desc->hdr.flash_base < offset)
                        offset = desc->hdr.flash_base;
 
@@ -198,7 +208,7 @@ fis_remap(struct fis_part *old, int n_old, struct fis_part *new, int n_new)
        }
        desc--;
 
-       size = offset - first->hdr.flash_base;
+       size = offset - first_fb->hdr.flash_base;
 
 #ifdef notyet
        desc = first - 1;
@@ -214,7 +224,7 @@ fis_remap(struct fis_part *old, int n_old, struct fis_part *new, int n_new)
 
        last++;
        desc = first + n_new;
-       offset = first->hdr.flash_base;
+       offset = first_fb->hdr.flash_base;
 
        if (desc != last) {
                if (desc > last)