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FS#13184: Support 2048 byte sectors and images without bootloader in ipod_fw

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(From Stefan Ott)

I wrote a little patch for ipod_fw.c that allows me to create bootable
images for the iPod video without using any external software.

The patch adds two new options:

- The -s option can now be used to specify the sector size in blocks (typically 512 or 2048) when generating an image.
- The -n option can be used to create an image without a boot loader

Change-Id: I35ebcd19ba1491bba76dfc8011e5a856108bb9ad
This commit is contained in:
Solomon Peachy 2020-03-29 12:46:52 -04:00
parent 51ad625404
commit 5fa6acf39f
1 changed files with 32 additions and 17 deletions
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49
tools/ipod_fw.c
View file

@ -110,7 +110,7 @@ usage()
{
printf("Usage: ipod_fw [-h]\n"
" ipod_fw [-v] -o outfile -e img_no fw_file\n"
" ipod_fw [-v] -g gen [-r rev] -o outfile [-i img_from_-e]* [-l raw_img]* ldr_img\n\n"
" ipod_fw [-v] -g gen [-r rev] [-s size] -o outfile [-i img_from_-e]* [-l raw_img]* ldr_img\n\n"
" -g: set target ipod generation, valid options are: 1g, 2g, 3g\n"
" 4g, 5g, scroll, touch, dock, mini, photo, color, nano and video\n"
" -e: extract the image at img_no in boot table to outfile\n"
@ -124,7 +124,9 @@ usage()
" may be needed if newest -e img is not the same as the flash rev\n"
" ldr_img is the iPodLinux loader binary.\n"
" first image is loaded by default, 2., 3., 4. or 5. loaded if\n"
" rew, menu, play or ff is hold while booting\n\n"
" rew, menu, play or ff is hold while booting\n"
" -n: do not add a boot loader (ldr_img)\n"
" -s: set sector size in bytes (default is 512)\n\n"
" -v: verbose\n\n"
" This program is used to create a bootable ipod image.\n\n");
}
@ -339,12 +341,13 @@ main(int argc, char **argv)
int images_done = 0;
unsigned version = 0, offset = 0, len = 0;
int needs_rcsc = 0;
int no_boot = 0;
test_endian();
/* parse options */
opterr = 0;
while ((c = getopt(argc, argv, "3hve:o:i:l:r:g:")) != -1)
while ((c = getopt(argc, argv, "3hve:o:i:l:nr:g:s:")) != -1)
switch (c) {
case 'h':
if (verbose || in || out || images_done || ext) {
@ -471,6 +474,9 @@ main(int argc, char **argv)
images_done++;
fclose(in);
break;
case 'n':
no_boot = 1;
break;
case 'r':
if (ext) {
usage();
@ -478,6 +484,9 @@ main(int argc, char **argv)
}
version = strtol(optarg, NULL, 16);
break;
case 's':
sectorsize = atoi(optarg);
break;
case '?':
fprintf(stderr, "invalid option -%c specified\n", optopt);
usage();
@ -488,7 +497,7 @@ main(int argc, char **argv)
return 1;
}
if (argc - optind != 1) {
if ((argc - optind != 1) && !no_boot) {
usage();
return 1;
}
@ -528,19 +537,22 @@ main(int argc, char **argv)
fprintf(stderr, "no images specified!\n");
return 1;
}
if ((in = fopen(argv[optind], "rb")) == NULL) {
fprintf(stderr, "Cannot open loader image file %s\n", argv[optind]);
return 1;
if (!no_boot)
{
if ((in = fopen(argv[optind], "rb")) == NULL) {
fprintf(stderr, "Cannot open loader image file %s\n", argv[optind]);
return 1;
}
offset = (offset + 0x1ff) & ~0x1ff;
if ((len = lengthof(in)) == -1)
return 1;
if (fseek(out, offset, SEEK_SET) == -1) {
fprintf(stderr, "fseek failed: %s\n", strerror(errno));
return 1;
}
if (copysum(in, out, len, 0) == -1)
return 1;
}
offset = (offset + 0x1ff) & ~0x1ff;
if ((len = lengthof(in)) == -1)
return 1;
if (fseek(out, offset, SEEK_SET) == -1) {
fprintf(stderr, "fseek failed: %s\n", strerror(errno));
return 1;
}
if (copysum(in, out, len, 0) == -1)
return 1;
for (i=0; i < images_done; i++) {
if (images[i].vers > image.vers) image.vers = images[i].vers;
if (write_entry(images+i, out, offset+0x0100, i) == -1)
@ -548,7 +560,10 @@ main(int argc, char **argv)
}
if (version) image.vers = version;
image.len = offset + len - FIRST_OFFSET;
image.entryOffset = offset - FIRST_OFFSET;
if (!no_boot)
{
image.entryOffset = offset - FIRST_OFFSET;
}
image.devOffset = (sectorsize==512 ? 0x4400 : 0x4800);
if ((image.chksum = copysum(out, NULL, image.len, FIRST_OFFSET)) == -1)
return 1;