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#!/usr/bin/env python
"""
Create firmware for 4/8MB Bifferboards, suitable for uploading using
either bb_upload8.py or bb_eth_upload8.py
"""
import struct, sys
# Increase the kmax value if the script gives errors about the kernel being
# too large. You need to set the Biffboot kmax value to the same value you
# use here.
kmax = 0x10
# No need to change this for 4MB devices, it's only used to tell you if
# the firmware is too large!
flash_size = 0x800000
# This is always the same, for 1MB, 4MB and 8MB devices
config_extent = 0x6000
kernel_extent = kmax * 0x10000
if __name__ == "__main__":
if len(sys.argv) != 4:
print "usage: mkimg_bifferboard.py <kernel> <rootfs> <output file>"
sys.exit(-1)
bzimage = sys.argv[1]
rootfs = sys.argv[2]
target = sys.argv[3]
# Kernel first
fw = file(bzimage).read()
if len(fw) > (kernel_extent - config_extent):
raise IOError("Kernel too large")
# Pad up to end of kernel partition
while len(fw) < (kernel_extent - config_extent):
fw += "\xff"
fw += file(rootfs).read()
# Check length of total
if len(fw) > (flash_size - 0x10000 - config_extent):
raise IOError("Rootfs too large")
file(target,"wb").write(fw)
print "Firmware written to '%s'" % target
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