target/linux/rdc/image/mkimg_bifferboard.py

   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
   8 import 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.
  13 kmax = 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!
  17 flash_size = 0x800000
  18
  19 # This is always the same, for 1MB, 4MB and 8MB devices
  20 config_extent = 0x6000
  21
  22 kernel_extent = kmax * 0x10000
  23
  24 if __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