Hi all,

I've been looking through the seL4 libraries and examples, and it seems to me 
that serial input should in some way be possible - the refos example appears to 
have a terminal, and I would imagine that debugging via GDB requires input in 
addition to output. However, the code to do this is unclear to me. Calling 
getchar() or similar leads to the unimplemented readv syscall, and calling 
__arch_getchar or similar causes a cap error even after running 
platsupport_serial_setup_simple().

Is there a step I'm missing? I'm specifically trying to get this working on 
RISC-V.

Thanks,

Baltazar
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