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[45.78.63.125]) by smtp.gmail.com with ESMTPSA id k11-20020aa79d0b000000b006dde36aaae7sm3411050pfp.64.2024.02.03.06.15.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Feb 2024 06:15:11 -0800 (PST) Date: Sat, 3 Feb 2024 22:15:04 +0800 From: Shawn Guo To: Marek Vasut Cc: linux-arm-kernel@lists.infradead.org, Conor Dooley , Fabio Estevam , Krzysztof Kozlowski , NXP Linux Team , Pengutronix Kernel Team , Rob Herring , Sascha Hauer , Shawn Guo , devicetree@vger.kernel.org Subject: Re: [PATCH] arm64: dts: imx8mp: Disable UART4 by default on Data Modul i.MX8M Plus eDM SBC Message-ID: <20240203141504.GH463595@dragon> References: <20231220000345.42593-1-marex@denx.de> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231220000345.42593-1-marex@denx.de> 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 Applied, thanks!