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Initial attempt at adding support for firmware images with 2048-byte sectors. Sector size is auto-detected, so both 5g and "5.5g" users can use the "-g video" (or its alias, "-g 5g") option to manipulate the firmware. I have tested this patch with 3G, 4G and 5G (512-byte sectors) and 5G (2048-byte sectors) images and it generates a "rockboot.bin" file with a matching MD5 checksum to either the previous version of ipod_fw.c, or the patched "ipod_fw_5.5g.c", as appropriate.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11703 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2006-12-10 11:02:48 +00:00
parent 7d0f00576e
commit 3f85262de2
1 changed files with 25 additions and 4 deletions
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29
tools/ipod_fw.c
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@ -34,9 +34,11 @@
#define TBL 0x4200
int sectorsize = 512;
/* Some firmwares have padding becore the actual image. */
#define IMAGE_PADDING ((fw_version == 3) ? 0x200 : 0)
#define FIRST_OFFSET (TBL + 0x200 + IMAGE_PADDING)
#define IMAGE_PADDING ((fw_version == 3) ? sectorsize : 0)
#define FIRST_OFFSET (TBL + ((sectorsize == 0x200) ? 0x200 : 0x600) + IMAGE_PADDING)
int be;
unsigned short fw_version = 2;
@ -180,6 +182,15 @@ load_entry(image_t *image, FILE *fw, unsigned offset, int entry)
return -1;
}
switch_endian(image);
/* If we find an "osos" image with devOffset 0x4800, we have 2048-byte
sectors. This isn't 100% future-proof, but works as of December 2006.
We display this information so users can spot any false-positives that
may occur in the future (although this is unlikely). */
if ((image->id==0x6f736f73) && (image->devOffset==0x4800)) {
sectorsize=2048;
fprintf(stderr,"Detected 2048-byte sectors\n");
}
return 0;
}
@ -219,8 +230,17 @@ extract(FILE *f, int idx, FILE *out)
fw_version = switch_16(fw_version);
image = (image_t *)buf;
if (load_entry(image, f, TBL, idx) == -1)
return -1;
/* We need to detect sector size, so always load image 0 directory
entry first */
if (load_entry(image, f, TBL, 0) == -1)
return -1;
if (idx > 0) { /* Now read the real image (if it isn't 0) */
if (load_entry(image, f, TBL, idx) == -1)
return -1;
}
off = image->devOffset + IMAGE_PADDING;
if (fseek(f, off, SEEK_SET) == -1) {
@ -529,6 +549,7 @@ main(int argc, char **argv)
if (version) image.vers = version;
image.len = offset + len - FIRST_OFFSET;
image.entryOffset = offset - FIRST_OFFSET;
image.devOffset = (sectorsize==512 ? 0x4400 : 0x4800);
if ((image.chksum = copysum(out, NULL, image.len, FIRST_OFFSET)) == -1)
return 1;
if (fseek(out, 0x0, SEEK_SET) == -1) {