| Message ID | 20231220000345.42593-1-marex@denx.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: dts: imx8mp: Disable UART4 by default on Data Modul i.MX8M Plus eDM SBC | expand |
On Tue, Dec 19, 2023 at 9:04 PM Marek Vasut <marex@denx.de> wrote: > > 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 <marex@denx.de> Reviewed-by: Fabio Estevam <festevam@gmail.com>
On Wed, Dec 20, 2023 at 01:02:42AM +0100, Marek Vasut wrote: > 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 <marex@denx.de> Applied, thanks!
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 34e9aecc403bd..88e1b76d7d75f 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 @@ -491,7 +491,7 @@ &uart3 { /* A53 Debug */ &uart4 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart4>; - status = "okay"; + status = "disabled"; }; &usb3_phy0 {
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 <marex@denx.de> --- Cc: Conor Dooley <conor+dt@kernel.org> Cc: Fabio Estevam <festevam@gmail.com> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org> Cc: NXP Linux Team <linux-imx@nxp.com> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Shawn Guo <shawnguo@kernel.org> Cc: devicetree@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/boot/dts/freescale/imx8mp-data-modul-edm-sbc.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)