大头fx 发表于 2017-6-14 15:49:12

Android 7.1 复用 uart4

按照官方wiki，修改完成，在串口不显示ttyS4
   aliases {
       ...
       serial0 = &uart0;
       serial1 = &uart1;
       serial2 = &uart2;
       serial3 = &uart3;
       serial4 = &uart4;
   };
uart4: serial@ff370000 {
       compatible = "rockchip,rk3399-uart", "snps,dw-apb-uart";
       reg = <0x0 0xff370000 0x0 0x100>;
       clocks = <&pmucru SCLK_UART4_PMU>, <&pmucru PCLK_UART4_PMU>;
       clock-names = "baudclk", "apb_pclk";
       interrupts = <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH 0>;
       reg-shift = <2>;
       reg-io-width = <4>;
       pinctrl-names = "default";
       pinctrl-0 = <&uart4_xfer>;
       status = "disabled";
   };
   uart4 {
       uart4_xfer: uart4-xfer {
       rockchip,pins =
               <1 7 RK_FUNC_1 &pcfg_pull_up>,
               <1 8 RK_FUNC_1 &pcfg_pull_none>;
       };
   };
&uart4 {
       current-speed = <9600>;
       no-loopback-test;
       status = "okay";
};
&spidev0 {
        status = "disabled";
};
就是这个步骤

大头fx 发表于 2017-6-15 16:28:19

已解决，在firefly_defconfig添加
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_NR_UARTS=5
+CONFIG_SERIAL_8250_RUNTIME_UARTS=5
# CONFIG_SERIAL_8250_PCI is not set
CONFIG_SERIAL_8250_DW=y
# CONFIG_HW_RANDOM is not set
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