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Commit Graph

8 Commits

Author SHA1 Message Date
Palmer Dabbelt
8c73d10fe1 Support SCR address generation with __OFFSET at the end 2016-02-25 21:57:37 -08:00
Palmer Dabbelt
a073c37e36 The FPGA doesn't have an HTIF clock divider
We used to just be writing the SCR anyway, but now that the SCR maps are
automatically defined VCS will detect the missing SCR and bail out when
compiling test harness code.  This patch just doesn't write the HTIF SCR when
there isn't one.
2016-02-22 16:15:07 -08:00
Palmer Dabbelt
926efd0cab Allow the number of memory channels to be picked at runtime
We're building a chip with 8 memory channels.  Since this will require a
complicated test setup we want to also be able to bring up the chip with fewer
memory channels.  This commit adds a SCR that controls the number of active
memory channels on a chip.  Toggling this SCR will scramble memory and drop
Nasti messages, so it's only possible to change while the chip is booting.

By default this just adds a 1-bit SCR, which essentially no extra logic.

When multiple memory channel configurations are enabled at elaboration time, a
NastiMemoryInterconnect is generated for each channel configuration.  The
number of outstanding misses is increased to coorespond to the maximum number
of banks per memory channel (added as a parameter), which I believe is
necessary to avoid deadlock in the memory system.

A configuration is added that supports 8 memory channels but has only 1 enabled
by default.
2016-02-17 15:23:30 -08:00
Palmer Dabbelt
db9de94588 Generate and use SCR address header files
This uses the new SCRFile changes to generate a header file containing a list
of all the SCRs in a core to remove the magic constant "63" (the HTIF clock
divider control register) and replace it with a generated number (which is
still 63).
2016-02-17 15:23:18 -08:00
Howard Mao
5e3f9115d3 make sure HTIF mem_mb doesn't exceed MMIOBase 2015-09-25 09:02:35 -07:00
Howard Mao
4496e8d4e2 make sure htif_emulator properly sets memory size 2015-09-22 10:32:31 -07:00
Yunsup Lee
1cfd9f5a0e add LICENSE 2014-09-12 10:15:04 -07:00
Andrew Waterman
4077b22929 include fesvr as a library; improve harnesses 2013-01-24 23:57:23 -08:00