Werner's Miscellanea

Werner's Miscellanea Git Source Tree

1	#!/usr/bin/perl
2	#
3	# mkboot - generate a bitstream (in .bit format) that boots an M1
4	# with the "regular" bitstream, using UrJTAG
5	#
6	# Hacked 2011 by Werner Almesberger
7	#
8
9	#
10	# bitstream file magic, copied from xilinx_bitstream.c:xlx_bitstream_load_bit
11	#
12
13	print pack("C*",
14	0x00, 0x09, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0,
15	0x0f, 0xf0, 0x00, 0x00, 0x01);
16
17	#
18	# The 0xffff dummy and the 0x2000 NOP seem to be unnecessary in this case,
19	# so we omit them.
20	#
21	# To boot the rescue bitstream instead of the regular bitstream, change
22	# the value of GENERAL2 from 0x0037 to 0x0005.
23	#
24
25	@seq = (
26	# 0xffff, # DUMMY
27	0xaa99, # Sync(1)
28	0x5566, # Sync(2)
29	0x3261, # write GENERAL1
30	0x0000, # start address 15:0
31	0x3281, # write GENERAL2
32	0x0037, # start address 23:16
33	0x30a1, # write CMD
34	0x000e); # IPROG
35	# 0x2000); # NOP
36
37	#
38	# "e" section in bitstream file, with the length in bytes.
39	#
40
41	print pack("aN", "e", 2*@seq);
42
43	#
44	# the actual bitstream
45	#
46
47	print pack("n*", @seq);
48

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