@@ -18,10 +18,29 @@ fin = open(sys.argv[1], 'rb')
fout = open(sys.argv[2], 'wb')
fin.seek(2)
-size = ord(fin.read(1)) * 512 - 1
-
+size_byte = ord(fin.read(1))
fin.seek(0)
-data = fin.read(size)
+
+if size_byte == 0:
+ # If the caller left the size field blank then we will fill it in,
+ # also rounding the whole input to a multiple of 512 bytes.
+ data = fin.read()
+ # +1 because we need a byte to store the checksum.
+ size = len(data) + 1
+ # Round up to next multiple of 512.
+ size += 511
+ size -= size % 512
+ if size >= 65536:
+ sys.exit("%s: option ROM size too large" % sys.argv[1])
+ # size-1 because a final byte is added below to store the checksum.
+ data = data.ljust(size-1, '\0')
+ data = data[:2] + chr(size/512) + data[3:]
+else:
+ # Otherwise the input file specifies the size so use it.
+ # -1 because we overwrite the last byte of the file with the checksum.
+ size = size_byte * 512 - 1
+ data = fin.read(size)
+
fout.write(data)
checksum = 0
Modify the signrom.py script so that if the size byte in the header is 0 (ie. not set) then the script will set the size. If the size byte is non-zero then we do the same as before, so this doesn't require changes to any existing ROM sourcecode. Signed-off-by: Richard W.M. Jones <rjones@redhat.com> --- scripts/signrom.py | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-)