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scripts/icestorm: add readme 

Notes about how to build proper simulation vs hardware bitstreams.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
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Austin Seipp 2019-01-11 15:55:56 -06:00
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To build the example LED-blinking firmware for an HX8K Breakout Board and get
a timing report (checked against the default 12MHz oscillator):
$ make clean example.bin timing
To run all the simulation tests:
$ make clean example_sim synth_sim route_sim FIRMWARE_COUNTER_BITS=4
(You must run the `clean` target to rebuild the firmware with the updated
`FIRMWARE_COUNTER_BITS` parameter; the firmware source must be recompiled for
simulation vs hardware, but this is not tracked as a Makefile dependency.)