Zynq-7000 peripheral limitations? about renode

[mateusz-holenko]

Hi @shareefj, thanks for the question.

Renode allows users to easily mock or partially model fragments of logic necessary to drive the simulation. In this context warning log messages about unhandled writes/reads do not always indicate errors. In many cases if your software behaves correctly, those can be treated strictly informational.

Having said that, if you do observe crashes or misbehavior related to a missing functionality, the model can/should be of course improved.

For easier debugging of such situations, using function names and peripheral access logging is very useful:

(machine-0) cpu LogFunctionNames true true
(machine-0) sysbus LogAllPeripheralsAccess true

Right now, the Zynq7000 SystemLevelControlRegisters model does not implement the UART_CLK_CTRL register which means that it will be read as 0.
If you need it to return a non-zero value I would suggest looking into the BuildRegisters method and adding the necessary logic there: https://github.com/renode/renode-infrastructure/blob/master/src/Emulator/Peripherals/Peripherals/Miscellaneous/Zynq7000_SystemLevelControlRegisters.cs#L37.