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m1/jtag-boot/mkboot: added comments with pointers to information sources

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This commit is contained in:
Werner Almesberger 2011-09-06 12:29:31 -03:00
parent 96a5dd3b60
commit f3b289413d
1 changed files with 29 additions and 1 deletions
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30
m1/jtag-boot/mkboot
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@ -6,11 +6,31 @@
# Hacked 2001 by Werner Almesberger
#
# magic, copied from xilinx_bitstream.c:xlx_bitstream_load_bit
#
# bitstream file magic, copied from xilinx_bitstream.c:xlx_bitstream_load_bit
#
# here is the source:
# http://urjtag.git.sourceforge.net/git/gitweb.cgi?p=urjtag/urjtag;a=blob_plain;f=urjtag/src/pld/xilinx_bitstream.c;hb=HEAD
#
print pack("C*",
0x00, 0x09, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0,
0x0f, 0xf0, 0x00, 0x00, 0x01);
#
# "bitstream" according to Table 7-1 (page 126) of
# http://www.xilinx.com/support/documentation/user_guides/ug380.pdf
#
# and the M1 standby bitstream:
# https://github.com/milkymist/milkymist/blob/master/boards/milkymist-one/standby/standby.v#L205
#
# The 0xffff dummy and the 0x2000 NOP seem to be unnecessary in this case,
# so we omit them.
#
# To boot the rescue bitstream instead of the regular bitstream, change
# the value of GENERAL2 from 0x0037 to 0x0005.
#
@seq = (
# 0xffff, # DUMMY
0xaa99, # Sync(1)
@ -23,6 +43,14 @@ print pack("C*",
0x000e); # IPROG
# 0x2000); # NOP
#
# "e" section in bitstream file, with the length in bytes.
#
print pack("aN", "e", 2*@seq);
#
# the actual bitstream
#
print pack("n*", @seq);