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