I am having trouble finding a way to access my HiFive1 rev B (FE310) CSRs with Freedom Studio. I have tried at all levels of the debug stack/tools I could find:
J-Link Commander (regs) (“connect” includes status line “CSR access via abs. commands: No”)
J-Link Commander (before “connect”) direct JTAG scan operations (appear broken for RISC-V.)
Is this not currently supported through the included J-Link OB probe firmware. (I could read them with Segger’s Embedded Studio debugger but I have no interest in using their tools.)
If you are using the latest version of Freedom Studio (2021-04-1 as of this writing) and you have a HiFive1 revB board, then you should see a CSR list, something like this: