LinkPatch.js

/* back-annotate the preboot code so that "unique_id_pnt" points to "unique_id" in pico2-debug */

function LinkPatch(filename)
{
  /* determine symbol location of "unique_id" in pico2-debug */
  ElfFile.load("pico2-debug THUMB Release/pico2-debug.elf");
  uid = ElfFile.symbolValue("unique_id");

  /* create a backup duplicate of the original ELF */
  backupFilename = filename + ".prepatch";
  CWSys.removeFile(backupFilename);
  CWSys.renameFile(filename, backupFilename);
  ElfFile.load(backupFilename);

  /* overwrite the now-known location into the right place in the preboot code */
  uid_pnt = ElfFile.symbolValue("unique_id_pnt");
  ElfFile.pokeUint32(uid_pnt, uid);

  /* write the modified data to the original filename */
  ElfFile.save(filename);
}