socfpge pin multiplexing issue

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socfpge pin multiplexing issue [Copy link]

  I want to use the serial port 1 of the lark board. I added a node in DTS Then after starting Linux, the display driver has been loaded, and ttyS1 appears under dev Now I use ttyS1 to send and receive data, but I find that I can only send data but not receive data. There is no problem with the application. I used another development board and the application was normal. Now I suspect that the C23 pin is not used as UART1. I knew how to allocate IO multiplexing in the kernel without using DTB before. How do I allocate IO after using DTB? I didn’t find the code to initialize the IO multiplexing function in DTS

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Brain dead, solved

lelee007

DTB does not care about the pin multiplexing configuration, which is initialized in the preloader.

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lelee007 posted on 2018-2-3 21:03 DTB does not care about the pin multiplexing configuration, the pin multiplexing configuration is initialized in the preloader

Yes, this is different from the pure ARM that I did before. In the past, the ARM was initialized in the DTB.