rv1126-rv1109-修改波特率为115200

今日修改波特率,遇到一个现象就是uboot一直都是1500000

1.修改uboot

index 674ff1a9be..20468f8ec9 100644
--- a/u-boot/arch/arm/dts/rv1126.dtsi
+++ b/u-boot/arch/arm/dts/rv1126.dtsi
@@ -265,9 +265,9 @@
                rockchip,serial-id = <2>;
                rockchip,wake-irq = <0>;
                rockchip,irq-mode-enable = <0>;
-               rockchip,baudrate = <1500000>;  /* Only 115200 and 1500000 */
+               rockchip,baudrate = <115200>;  /* Only 115200 and 1500000 */
                interrupts = <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>;
-               status = "disabled";
+               status = "okay";
        };
 
--- a/configs/rv1126_defconfig
+++ b/configs/rv1126_defconfig
@@ -156,7 +156,7 @@ CONFIG_ROCKCHIP_SDRAM_COMMON=y
 CONFIG_DM_RESET=y
 CONFIG_SPL_DM_RESET=y
 CONFIG_SPL_RESET_ROCKCHIP=y
-CONFIG_BAUDRATE=1500000
+CONFIG_BAUDRATE=115200
 CONFIG_DEBUG_UART_BASE=0xff570000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_DEBUG_UART_SHIFT=2

2.kernel

--- a/kernel/arch/arm/boot/dts/rv1126.dtsi
+++ b/kernel/arch/arm/boot/dts/rv1126.dtsi
@@ -332,7 +332,7 @@
                rockchip,serial-id = <2>;
                rockchip,wake-irq = <0>;
                rockchip,irq-mode-enable = <0>;
-               rockchip,baudrate = <1500000>;  /* Only 115200 and 1500000 */
+               rockchip,baudrate = <115200>;  /* Only 115200 and 1500000 */
                interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>;
                status = "disabled";
        };

3.buildroot

buildroot/configs/rockchip/rv1126_rv1109_arm.config，找到1500000参数，改为115200.

--- a/buildroot/configs/rockchip/chips/rv1126_rv1109_arm.config
+++ b/buildroot/configs/rockchip/chips/rv1126_rv1109_arm.config
@@ -1,3 +1,5 @@
 #include "chips/rv1126_rv1109.config"
 #include "toolchain/arm_8_armhf.config"
 BR2_arm=y
+BR2_TARGET_GENERIC_GETTY_BAUDRATE_115200=y

=========================================================================

uboot阶段一直都没有变化直到我该了另外一个地方

4.修改DDR初始化和SPL初始化波特率

diff --git a/rkbin/tools/ddrbin_param.txt b/rkbin/tools/ddrbin_param.txt
old mode 100644
new mode 100755
index 711d32c5e..718cca5e2
--- a/rkbin/tools/ddrbin_param.txt
+++ b/rkbin/tools/ddrbin_param.txt
@@ -11,7 +11,7 @@ lp5_freq=
 
 uart id=
 uart iomux=
-uart baudrate=
+uart baudrate=115200
 
 sr_idle=
 pd_idle=

然后编译一下

./ddrbin_tool ddrbin_param.txt ../bin/rv11/rv1126_ddr_924MHz_v1.10.bin

然后重新编译之后就可以看到全部波特率为115200.

参考博客:

rockchip SDK修改波特率为115200_修改波特率设置为115200_Keith-Yang的博客-CSDN博客

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