原创 VS-RK3399 Android 系统串dts配置介绍资料

2019-4-19 17:59 2009 11 11 分类: PCB
RK3399-UART功能特点
1、UART (Universal Asynchronous Receiver/Transmitter),以下是linux 4.4 uart驱动支持的一些特性︰
 最高支持4M波特率
 只有UART0和UART3支持硬件自动流控
 支持中断传输模式

2、 DTS节点配置
使能,无需其他配置: &uart0 { status = "okay"; }; 使能后/dev/ttyS0 设备就可以使用。


3、关闭Linux串口打印
3.1 关掉FIQ debugger,Disable以下节点 
fiq_debugger: fiq-debugger {
compatible = "rockchip,fiq-debugger"; 
rockchip,serial-id = <2>; 设置串口id 
rockchip,signal-irq = <182>;
rockchip,wake-irq = <0>; 
rockchip,irq-mode-enable = <1>; /* If enable uart uses irq instead of fiq */
rockchip,baudrate = <1500000>; /* Only 115200 and 1500000 */ 
pinctrl-names = "default";
pinctrl-0 = <&uart2c_xfer>; 配置iomux 
status = “disabled”; 
}

3.2 去掉earlyprintk=uart8250-32bit,0xff690000 
chosen {
bootargs = "earlyprintk=uart8250-32bit,0xff690000"; 
};
3.3 在烧写parameter.txt
commandline:androidboot.console=ttyFIQ0,去掉ttyFIQ0。

3.4 android/device/rockchip/common/recovery/etc/init.rc
service recovery /sbin/recovery 
#console 这个注释掉 
seclabel u:r:recovery:s0


4 打印串口2改为其他串口
fiq_debugger: fiq-debugger { 
compatible = "rockchip,fiq-debugger"; 
rockchip,serial-id = <2>; 设置串口id 
rockchip,signal-irq = <182>; 
rockchip,wake-irq = <0>;
rockchip,irq-mode-enable = <1>; /* If enable uart uses irq instead of fiq */ 
rockchip,baudrate = <1500000>; /* Only 115200 and 1500000 */ 
pinctrl-names = "default";
pinctrl-0 = <&uart2c_xfer>; 配置iomux
};
chosen { 
bootargs = "earlyprintk=uart8250-32bit,0xff690000"; 新串口的地址 
};

以上所需信息都可以,通过串口设备的DTS节点获取,举个例子:
uart1: serial@ff190000 { 
compatible = "rockchip,rk3399-uart", "snps,dw-apb-uart";
reg = <0x0 0xff190000 0x0 0x100>; 
clocks = <&cru SCLK_UART1>, <&cru PCLK_UART1>; 
clock-names = "baudclk", "apb_pclk"; 
interrupts =
dmas = <&dmac_peri 2>, <&dmac_peri 3>; 
dma-names = "tx", "rx";
reg-shift = <2>; reg-io-width = <4>; 
pinctrl-names = "default"; 
/*pinctrl-0 = <&uart1_xfer>;*/ 
status = "disabled"; 
};

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