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diff --git a/target/linux/x86/image/mkimg_bifferboard.py b/target/linux/x86/image/mkimg_bifferboard.py
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+++ b/target/linux/x86/image/mkimg_bifferboard.py
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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