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m1/jtag-boot/: moved explanation from mkboot to README and added more details

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This commit is contained in:
Werner Almesberger
2011-09-06 18:54:39 -03:00
parent f3b289413d
commit bcd12fe644
2 changed files with 63 additions and 9 deletions
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9
m1/jtag-boot/mkboot
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@@ -9,20 +9,11 @@
#
# 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.