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#!/usr/bin/env python
"""
Create firmware for 8MB Bifferboards
Firmware does not include the config blocks
Firmware starts just after config
"""
import struct, sys
kernel_extent = 0x200000
config = 0x6000
if __name__ == "__main__":
if len(sys.argv) != 4:
print "usage: mkimg_bifferboard.py <kernel> <64k JFFS> <output file>"
sys.exit(0)
bzimage = sys.argv[1]
rootfs = sys.argv[2]
target = sys.argv[3]
# Kernel first
fw = file(bzimage).read()
if len(fw) > (kernel_extent - config):
raise IOError("Kernel too large")
# Pad up to 0x200000
while len(fw) < (kernel_extent - config):
fw += "\xff"
fw += file(rootfs).read()
# Check length of total
if len(fw) > (0x800000 - 0x10000 - 0x6000):
raise IOError("Rootfs too large")
file(target,"wb").write(fw)
print "Firmware written to '%s'" % target
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