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57 lines
1.4 KiB
Perl
Executable File
57 lines
1.4 KiB
Perl
Executable File
#!/usr/bin/perl
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#
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# mkboot - generate a bitstream (in .bit format) that boots an M1
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# with the "regular" bitstream, using UrJTAG
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#
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# Hacked 2001 by Werner Almesberger
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#
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#
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# bitstream file magic, copied from xilinx_bitstream.c:xlx_bitstream_load_bit
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#
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# here is the source:
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# http://urjtag.git.sourceforge.net/git/gitweb.cgi?p=urjtag/urjtag;a=blob_plain;f=urjtag/src/pld/xilinx_bitstream.c;hb=HEAD
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#
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print pack("C*",
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0x00, 0x09, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0,
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0x0f, 0xf0, 0x00, 0x00, 0x01);
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#
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# "bitstream" according to Table 7-1 (page 126) of
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# http://www.xilinx.com/support/documentation/user_guides/ug380.pdf
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#
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# and the M1 standby bitstream:
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# https://github.com/milkymist/milkymist/blob/master/boards/milkymist-one/standby/standby.v#L205
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#
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# The 0xffff dummy and the 0x2000 NOP seem to be unnecessary in this case,
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# so we omit them.
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#
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# To boot the rescue bitstream instead of the regular bitstream, change
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# the value of GENERAL2 from 0x0037 to 0x0005.
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#
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@seq = (
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# 0xffff, # DUMMY
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0xaa99, # Sync(1)
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0x5566, # Sync(2)
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0x3261, # write GENERAL1
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0x0000, # start address 15:0
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0x3281, # write GENERAL2
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0x0037, # start address 23:16
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0x30a1, # write CMD
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0x000e); # IPROG
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# 0x2000); # NOP
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#
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# "e" section in bitstream file, with the length in bytes.
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#
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print pack("aN", "e", 2*@seq);
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#
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# the actual bitstream
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#
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print pack("n*", @seq);
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