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