On Hurricane we want to be able to support multiple memory channels but have a
fallback to fewer, since the full configuration is going to require a
complicated FPGA setup. This adds another sort of interconnect that can switch
between having different numbers of top-level memory channels active at chip
boot time.
This interconnect is a bit funny: changing the select input when there is
memory traffic is a bad idea. This is fine for this use case, since we really
only care about changing the memory configuration at boot time -- since it'll
scramble the memory of the machine it's not so useful, anyway.
The advantage is that we don't have to have a full 8x8 Nasti crossbar in our
chip, which would be fairly expensive. Changing the crossbar would garble
memory as well, so it's not like it would add any extra functionality.
Without this it's really hard to read the IllegalArgumentException that you get
if you subclass ParamaterizedBundle and don't define a matching cloneType().
* DMA frontend-backend communication tunneled over TileLink/AXI
* Split MMIO and Mem requests in l1tol2net instead of in AXI interconnect
* Don't make NIOMSHRs configurable. Fixed at 1.
* Connect accelerator-internal CSRs into the CSR file
* Make mtvec register configurable and writeable
Since we're separating memory and MMIO traffic in the L1 to L2 network,
we won't need to route between memory and MMIO at the AXI interconnect.
This means we can have separate (and simpler) AXI interconnects for
each. One consequence of this is that the starting address of the IO
interconnect can no longer be assumed to be 0 by default.
It looks like Chisel fails when I try to run it in parallel. This adds a lock
file to ensure that only a single Chisel instance is running at a time when
running the regressions.
make changed its priorties for resolving implicit rules, which causes different
behavior when running "make run-bmark-tests". This patch changes the hex file
rules to ensure they match between the two versions of make.
I've tried this with both make-3.81 and make-4.1, and they both work for me.
In order to have the buildbot support various types of failures it needs
to run different commands. Rather than modifying the regression script
to have a bunch of arguments I've just gone and made a makefile for
regressions instead.
This doesn't run torture right now because that's broken, but I'll add
support soon.
