El 2023-12-08 17:06, Thomas Schaefer va escriure:
Hi Macpaul, Fabien,
I'm referring to patch series
https://patchwork.ozlabs.org/project/uboot/patch/20230804110448.24589-1-macpaul....@mediatek.com/
where support for the mediatek mt8195 SOC is introduced into u-boot.
We are developing a board based on the mt8195 as well but we want to
use UART1 instead of UART0 for debug output messages.
Our board is booting and we see boot messages on a debug pin header
connected to UART0 when using the settings from the demo board, but
when trying to switch to UART1, no more messages appear on the
console. What we have tried is the following:
- Adaptation of the dts and dtsi files with uart1 settings taken from
linux device tree:
diff --git a/arch/arm/dts/mt8195.dtsi b/arch/arm/dts/mt8195.dtsi
index a7e4db5aa7..53eb437fad 100644
--- a/arch/arm/dts/mt8195.dtsi
+++ b/arch/arm/dts/mt8195.dtsi
@@ -245,6 +245,17 @@
status = "disabled";
};
+ uart1: serial@11001200 {
+ compatible = "mediatek,mt8195-uart",
+ "mediatek,hsuart";
+ reg = <0 0x11001200 0 0x1000>;
+ interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>;
+ clock-frequency = <26000000>;
+ clocks = <&clk26m>, <&clk26m>;
+ clock-names = "baud", "bus";
+ status = "disabled";
+ };
+
pericfg_ao: syscon@11003000 {
compatible = "mediatek,mt8195-pericfg_ao",
"syscon";
reg = <0 0x11003000 0 0x1000>;
diff --git a/arch/arm/dts/mt8195-kontron-sbc-i1200.dts
b/arch/arm/dts/mt8195-kontron-sbc-i1200.dts
index c6ea7e8f3d..4700a6d303 100644
--- a/arch/arm/dts/mt8195-kontron-sbc-i1200.dts
+++ b/arch/arm/dts/mt8195-kontron-sbc-i1200.dts
@@ -58,7 +58,7 @@
};
chosen {
- stdout-path = &uart0;
+ stdout-path = &uart1;
};
reg_1p8v: regulator-1p8v {
@@ -121,7 +121,7 @@
status = "okay";
};
-&uart0 {
+&uart1 {
status = "okay";
};
We also tried to change the DEBUG_UART settings in the defconfig to
match with UART1, but without success.
Are there any special means to make UART1 interface run?
Did you had a look in the DTS from the kernel:
https://elixir.bootlin.com/linux/v6.7-rc6/source/arch/arm64/boot/dts/mediatek/mt8195.dtsi#L1040
My bet would be that infracfg_ao CLK_INFRA_AO_UART1 is not configured
correctly.
Best regards,
Matthias.
Best regards,
Thomas
Thomas Schäfer
SW Design Engineer
T:
+49 681 95916 203
thomas.schae...@kontron.com
www.kontron.com
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