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器件型号：AM625 您好！
我们的定制板将使用 UART4作为串行控制台。
由于电路板尚未完成、我们正在使用 AM62x-SK EVM 进行实验。
我们对 U-Boot 的 DTS 进行了如下修改：
diff --git a/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi b/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi
index b57d9563d87..51397bfdfdd 100644
--- a/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi
+++ b/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi
@@ -68,11 +68,11 @@
u-boot,dm-spl;
};
-&main_uart0 {
+&main_uart4 {
u-boot,dm-spl;
};
-&main_uart0_pins_default {
+&main_uart4_pins_default {
u-boot,dm-spl;
};
diff --git a/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common.dtsi b/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common.dtsi
index fd52bb2872e..a899b8394ea 100644
--- a/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common.dtsi
+++ b/sdk/u-boot/arch/arm/dts/k3-am62x-sk-common.dtsi
@@ -14,7 +14,7 @@
/ {
aliases {
- serial2 = &main_uart0;
+ serial2 = &main_uart4;
mmc0 = &sdhci0;
mmc1 = &sdhci1;
mmc2 = &sdhci2;
@@ -141,10 +141,10 @@
};
&main_pmx0 {
- main_uart0_pins_default: main-uart0-pins-default {
+ main_uart4_pins_default: main-uart4-pins-default {
pinctrl-single,pins = <
- AM62X_IOPAD(0x1c8, PIN_INPUT, 0) /* (D14) UART0_RXD */
- AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14) UART0_TXD */
+ AM62X_IOPAD(0x0124, PIN_INPUT, 3) /* (A23) MMC2_SDCD.UART4_RXD */
+ AM62X_IOPAD(0x0128, PIN_OUTPUT, 3) /* (B23) MMC2_SDWP.UART4_TXD */
>;
};
@@ -273,8 +273,7 @@
};
&main_uart0 {
- pinctrl-names = "default";
- pinctrl-0 = <&main_uart0_pins_default>;
+ status = "disabled";
};
&main_uart1 {
@@ -291,7 +290,8 @@
};
&main_uart4 {
- status = "disabled";
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_uart4_pins_default>;
};
&main_uart5 {
然后，在 R5 SPL 中的 serial_find_console_or_paner()发生了恐慌。
原因似乎是 ti_clk_of_xlate ()正在返回一个错误。
在 arch/arm/dts/k3-am65-main.dtsi 中、UART0和 UART4定义如下：
main_uart0: serial@2800000 {
compatible = "ti,am64-uart", "ti,am654-uart";
reg = <0x00 0x02800000 0x00 0x100>;
interrupts = <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 146 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 146 0>;
clock-names = "fclk";
};
...
main_uart4: serial@2840000 {
compatible = "ti,am64-uart", "ti,am654-uart";
reg = <0x00 0x02840000 0x00 0x100>;
interrupts = <GIC_SPI 182 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 155 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 155 0>;
clock-names = "fclk";
};
我们假设之所以产生该误差、是因为与此误差相对应的定义 时钟=<&K3_CLKS 155 0> arch/arm/mach-k3/am62x/clk-data.c 中不存在。
static const struct dev_clk soc_dev_clk_data[] = {
...
DEV_CLK(146, 0, "main_usart0_fclk_sel_out0"),
DEV_CLK(146, 1, "usart_programmable_clock_divider_out0"),
DEV_CLK(146, 2, "hsdiv4_16fft_main_1_hsdivout1_clk"),
DEV_CLK(146, 5, "sam62_pll_ctrl_wrap_main_0_chip_div1_clk_clk"),
...
}
您可以建议如何解决此问题吗？
