>El 2023-12-08 17:06, Thomas Schaefer va escriure: >> Hi Macpaul, Fabien, >> >> I'm referring to patch series >> https://patc/ >> hwork.ozlabs.org%2Fproject%2Fuboot%2Fpatch%2F20230804110448.24589-1-ma >> cpaul.lin%40mediatek.com%2F&data=05%7C02%7CThomas.Schaefer%40kontron.c >> om%7C7254656e8bcd4aaa665608dc006d75f3%7C8c9d3c973fd941c8a2b1646f3942da >> f1%7C0%7C0%7C638385717332491611%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLj >> AwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&s >> data=eNa2nC%2BcBA8g8GC2z32nBO%2B4MvKIJGb2XU2lw3EqzTE%3D&reserved=0 >> 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. >
Hi Matthias, actually the problem was that we didn't enable some transceivers on UART1 line. After fixing this, UART1 now works without problems. Best regards, Thomas >> >> Best regards, >> Thomas >> >> Thomas Schäfer >> SW Design Engineer >> >> >> Kontron Europe GmbH >> Heinrich-Barth-Straße 1-1a | 66115 Saarbrücken | Germany
