From f03869698bc3bd6d9d2d9f216b20da08a8c2508a Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Wed, 20 Dec 2023 01:02:42 +0100 Subject: [PATCH] arm64: dts: imx8mp: Disable UART4 by default on Data Modul i.MX8M Plus eDM SBC UART4 is used as CM7 coprocessor debug UART and may not be accessible from Linux in case it is protected by RDC. The RDC protection is set up by the platform firmware. UART4 is not used on this platform by Linux. Disable UART4 by default to prevent boot hangs, which occur when the RDC protection is in place. Fixes: 562d222f23f0 ("arm64: dts: imx8mp: Add support for Data Modul i.MX8M Plus eDM SBC") Signed-off-by: Marek Vasut Reviewed-by: Fabio Estevam Signed-off-by: Shawn Guo --- arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts b/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts index d98a040860a4..5828c9d7821d 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts +++ b/arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts @@ -486,7 +486,7 @@ &uart4 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart4>; - status = "okay"; + status = "disabled"; }; &usb3_phy0 {