diff options
| author | Prashanth Mundkur | 2018-10-23 15:17:22 -0700 |
|---|---|---|
| committer | Prashanth Mundkur | 2018-10-23 15:45:09 -0700 |
| commit | 1e7b116842ea0e0ad76a70e2736398ef2211dde9 (patch) | |
| tree | 32147929c1cf633e26a7b71e46e8952648bd98a2 /riscv | |
| parent | 852929bb8b47993bcb642ada41802383a308c9c2 (diff) | |
RISC-V: use stderr for terminal output in OCaml backend.
Also add a brief README for booting Linux on the C and OCaml backends.
Diffstat (limited to 'riscv')
| -rw-r--r-- | riscv/README | 23 | ||||
| -rw-r--r-- | riscv/platform_impl.ml | 2 |
2 files changed, 24 insertions, 1 deletions
diff --git a/riscv/README b/riscv/README new file mode 100644 index 00000000..b925821e --- /dev/null +++ b/riscv/README @@ -0,0 +1,23 @@ +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. diff --git a/riscv/platform_impl.ml b/riscv/platform_impl.ml index e593dce9..c5cc3fff 100644 --- a/riscv/platform_impl.ml +++ b/riscv/platform_impl.ml @@ -159,7 +159,7 @@ let make_dtb dts = (* Call the dtc compiler, assumed to be at /usr/bin/dtc *) (* Terminal I/O *) let term_write char = - ignore (Unix.write_substring Unix.stdout (String.make 1 char) 0 1) + ignore (Unix.write_substring Unix.stderr (String.make 1 char) 0 1) let rec term_read () = let buf = Bytes.make 1 '\000' in |