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riscv-software-src / riscv-pk

RISC-V Proxy Kernel
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Adding support for new physical to virtual memory translation #149

Closed Bhagyaraja closed 5 years ago

Bhagyaraja commented 5 years ago

Hello,

I'm using this Proxy Kernel for Ariane. It is working fine with the existing peripherals of the Ariane. However, I'm unable to access the new peripherals (which have a new physical address) of the Ariane. Is there any way to add physical memory - virtual memory translation for the new peripherals (Similar to mmap() in Linux)?

aswaterman commented 5 years ago

pk isn’t designed to support direct I/O access to userspace. In fact, it really is only meant to run very basic programs for testing purposes. You might be better off running Linux and using mmap, or writing device drivers.

Bhagyaraja commented 5 years ago

Hello @aswaterman,

Thank you for the quick response. Do you have any sample driver (that is used with proxy-kernel) for reference?

Regards, Bhagyaraja Adapa

aswaterman commented 5 years ago

Oh, sorry, a poorly placed comma made what I wrote ambiguous. I meant, "running Linux and {either using mmap or writing device drivers}" - not writing a proxy kernel device driver. It isn't architected to support real devices. That is the "proxy" part of "proxy kernel" - it only supports fake devices by forwarding I/O to a host system.

Bhagyaraja commented 5 years ago

Okay. Thank you for your response.