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From:   dillon.minfei@gmail.com
To:     robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        parthiban@linumiz.com, kernel@pengutronix.de, festevam@gmail.com,
        linux-imx@nxp.com, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     dillon min <dillon.minfei@gmail.com>
Subject: [PATCH] ARM: dts: imx6ull: fix ubi filesystem mount failed
Date:   Tue,  9 Mar 2021 14:15:20 +0800
Message-Id: <1615270520-16951-2-git-send-email-dillon.minfei@gmail.com>
In-Reply-To: <1615270520-16951-1-git-send-email-dillon.minfei@gmail.com>
References: <1615270520-16951-1-git-send-email-dillon.minfei@gmail.com>
Precedence: bulk

From: dillon min <dillon.minfei@gmail.com>

since Micron MT29F2G08ABAEAWP's ecc error management:

|Description           			| Requirement
|Minimum required ECC  			| 4-bit ECC per 528 bytes
|Minimum ECC with internal ECC enabled  | 4-bit ECC per 516 bytes (user data) +
                                         8bytes (parity data)

to avoid unnecessary overheads related to bigger ecc calculations.
need choose to use fsl,use-minimum-ecc, else will run into ecc error.

[    9.449265] ubi0: scanning is finished
[    9.463968] ubi0 warning: ubi_io_read: error -74 (ECC error) while reading
22528 bytes from PEB 513:4096, read only 22528 bytes, retry
[    9.486940] ubi0 warning: ubi_io_read: error -74 (ECC error) while reading
22528 bytes from PEB 513:4096, read only 22528 bytes, retry
[    9.509906] ubi0 warning: ubi_io_read: error -74 (ECC error) while reading
22528 bytes from PEB 513:4096, read only 22528 bytes, retry
[    9.532845] ubi0 error: ubi_io_read: error -74 (ECC error) while reading
22528 bytes from PEB 513:4096, read 22528 bytes

Fixes: f9ecf10cb88c ("ARM: dts: imx6ull: add MYiR MYS-6ULX SBC")
Signed-off-by: dillon min <dillon.minfei@gmail.com>
---
 arch/arm/boot/dts/imx6ull-myir-mys-6ulx-eval.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx6ull-myir-mys-6ulx-eval.dts b/arch/arm/boot/dts/imx6ull-myir-mys-6ulx-eval.dts
index ecbb2cc5b9ab..79cc45728cd2 100644
--- a/arch/arm/boot/dts/imx6ull-myir-mys-6ulx-eval.dts
+++ b/arch/arm/boot/dts/imx6ull-myir-mys-6ulx-eval.dts
@@ -14,5 +14,6 @@
 };
 
 &gpmi {
+	fsl,use-minimum-ecc;
 	status = "okay";
 };
-- 
2.7.4