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UART drivers for rk3399

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Posted at 2/9/2018 21:27:15     
Does nougat source code provide UART drivers?
Because I have tried to search in nougat source code(See link: https://gitlab.com/TeeFirefly/FireNow-Nougat/tree/firefly-rk3399) but I did not find anything related UART.
And how we can fetch data from uart4 port without using any USB-serial converter?
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Posted at 2/10/2018 10:44:39     
it depend on what device u want to connect,
because uart conversation need the same voltage or property transfer module.
serial driver dir "kernel/drivers/serial"
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Posted at 2/12/2018 15:04:32     
leung先森 Posted at 2/10/2018 10:44
it depend on what device u want to connect,
because uart conversation need the same voltage or pro ...

Right, But I am not able to find the 'serial' folder under drivers.(I am looking into this source code: https://gitlab.com/TeeFirefly/Fi ... 3399/kernel/drivers)
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Posted at 2/13/2018 23:11:36     
I am trying to interface GPS module with rk3399 via UART but I am not using any USB-UART adaptor in between. So, I am connecting usart4(Rx,Tx) pins directly to the GPS module.But, I don't know how to see the data transmitted by the GPS module in firefly rk3399.Is there any way to see the data in firefly rk3399?And if we need to make any changes in kernel file than what they should be?
In short How we can interface this GPS module(LInk: ) with firefly rk3399?
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