RISC-V: use stderr for terminal output in OCaml backend.

Also add a brief README for booting Linux on the C and OCaml backends.

1 files changed, 23 insertions, 0 deletions

diff --git a/riscv/README b/riscv/README
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+Booting Linux with the C backend:
+---------------------------------
+
+The C model needs an ELF-version of the BBL (Berkeley-Boot-Loader) that contains
+the Linux kernel as an embedded payload.  It also needs a DTB (device-tree blob)
+file describing the platform.  Once those are available, the model should be run
+as:
+
+$ ./riscv_sim -b spike.dtb bbl > execution-trace.log 2>&1 &
+$ tail -f term.log
+
+The term.log file contains the console boot messages.
+
+
+Booting Linux with the OCaml backend:
+-------------------------------------
+
+The OCaml model only needs the ELF-version of the BBL, since it can generate its
+own DTB.
+
+$ ./platform bbl > execution-trace.log
+
+The console output is sent to stderr.