UART driver as kld - how?

[Oliver Pinter]

On Sunday, October 27, 2019, Milan Obuch <freebsd-hackers at dino.sk> wrote:

> Hi,
>
> I am trying to create a driver for Xilinx' AXI UART Lite IP core. I
> can't find a way to do it as kld module. I started with
> uart_dev_cdnc.c, but I can't see how it is hooked into the kernel - or,
> better formulated, how can I created kld loadable module. As Zynq has
> uart_dev_cdnc driver for its PS UART, all necessary files are compiled
> into kernel, but how can I extend those modules tables to work with new
> driver too?
>
> You can ask why I want it this way, if I can put this into kernel...
> simply this would make development awkward - every change would mean
> recompile everything (or at least relinking kernel) and reboot. With
> kld, I can just rebuild the module, reinstall it, unload old/load new
> version and test. Other thing is, for any IP core I must first load hw
> design into PL part (FPGA bitstream, actually), there is simply no
> device without this step performed.
>
> Did anybody already create something similar? Any help/hint/pointer
> appreciated...


https://github.com/freebsd/freebsd/tree/master/share/examples/kld


>
> Regards,
> Milan
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