1#!/usr/bin/env python
2
3"""
4   Create firmware for 4/8MB Bifferboards, suitable for uploading using
5   either bb_upload8.py or bb_eth_upload8.py
6"""
7
8import struct, sys
9
10# Increase the kmax value if the script gives errors about the kernel being
11# too large.  You need to set the Biffboot kmax value to the same value you
12# use here.
13kmax = 0x10
14
15# No need to change this for 4MB devices, it's only used to tell you if
16# the firmware is too large!
17flash_size = 0x800000
18
19# This is always the same, for 1MB, 4MB and 8MB devices
20config_extent = 0x6000
21
22kernel_extent = kmax * 0x10000
23
24if __name__ == "__main__":
25
26  if len(sys.argv) != 4:
27    print  "usage: mkimg_bifferboard.py <kernel> <rootfs> <output file>"
28    sys.exit(-1)
29
30  bzimage = sys.argv[1]
31  rootfs = sys.argv[2]
32  target = sys.argv[3]
33
34  # Kernel first
35  fw = file(bzimage).read()
36  if len(fw) > (kernel_extent - config_extent):
37    raise IOError("Kernel too large")
38
39  # Pad up to end of kernel partition
40  while len(fw) < (kernel_extent - config_extent):
41    fw += "\xff"
42
43  fw += file(rootfs).read()
44
45  # Check length of total
46  if len(fw) > (flash_size - 0x10000 - config_extent):
47    raise IOError("Rootfs too large")
48
49  file(target,"wb").write(fw)
50  print "Firmware written to '%s'" % target
51