Give higher priority to data accesses from the CPU to improve
performance. This is the recommended setup for Ibex.
The test utility host needs still higher priority, otherwise the CPU
takes all bus capacity (the downside of strict priority arbitration).
Previously, verilated_toplevel.h contained a macro, VERILATED_TOPLEVEL()
to produce a class TOPLEVEL (whatever the toplevel happens to be). This
required all compilation units referring to that TOPLEVEL class to call
the macro.
After this change, the class is always generated in
verilated_toplevel.h. For that to work, a new define TOPLEVEL_NAME must
be globally set (e.g. passed to the compiler with -DTOPLEVEL_NAME=xxx).
- Add required signals to top-level
- Propagate error through fetch stages
- Add new exception type
- Update documentation for new exception type
- Resolves issue #109
This adds a Verilator simulation of Ibex for use in RISC-V Compliance
Testing. In addition to ibex itself, the simulation contains a RAM and
a memory-mapped helper module for the test software to interact with the
outside world. The test framework uses this to dump a "test signature",
which is written to a certain part of the memory, and to end the
simulation. (In the future, this could be extended to include printf()
like functionality.)
This change is slighly painful, but a necessary cleanup around the
tracer.
- We now provide a separate core file for the tracer, called
"ibex_tracer.core" (in line with "ibex_tracer.sv"). The core is called
"lowrisc:ibex:ibex_tracer".
- The toplevel wrapper with tracing enabled got renamed to
"ibex_core_tracing.sv", and the core file is correspondingly called
"ibex_core_tracing.core. The core in it is called
"lowrisc:ibex:ibex_core_tracing".
- Finally to keep symmetry, the toplevel of Ibex itself got renamed in
the core file from "lowrisc:ibex:ibex" to "lowrisc:ibex:ibex_core".
This ensures that we have the same name for the core file, the source
entry point, and the core name.
IMPORTANT NOTE:
If you apply this change and use fusesoc, you need to adjust the name of
the core dependency from "lowrisc:ibex:ibex" to
"lowrisc:ibex:ibex_core".
