[HELP] <How to add sifive uart support？>

[yorange1]

Description

Hello everyone，

I am trying to run Nuttx on a platform that uses sifive uart. OpenSBI prints information and completes the jump, but there is no output in Nuttx. I realize that there seems to be no driver support for sifive uart in Nuttx. How should I add this driver in Nuttx? Is there any guiding document here?

Thanks

Verification

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[anjiahao1]

drivers/serial add uart dirver in here

[anjiahao1]

serial_cmsdk.c is a arm cmsdk uart dirver, you can follow it add a sifive uart dirver.