Due to hardware issues the usdhc3 interface on phyBOARD-ALCOR i.MX6 and
phyBOARD-SUBRA i.MX6 doesn't work reliable at 50Mhz. You get
communication errors like
barebox@Phytec phyBOARD SUBRA:/ ls /mnt/mmc/
mmc2: detected SD card version 2.0
mmc2: registered mmc2
imx-esdhc 2198000.usdhc: timeout 2
mmc2: Cannot read MBR/partition table
Therefore reduce the maximum clock speed to avoid these problems.
Signed-off-by: Stefan Christ <s.christ@xxxxxxxxx>
---
arch/arm/dts/imx6q-phytec-phyboard-alcor.dts | 1 +
arch/arm/dts/imx6qdl-phytec-phyboard-subra.dtsi | 1 +
2 files changed, 2 insertions(+)
diff --git a/arch/arm/dts/imx6q-phytec-phyboard-alcor.dts b/arch/arm/dts/imx6q-phytec-phyboard-alcor.dts
index a60fc18..1c4a785 100644
--- a/arch/arm/dts/imx6q-phytec-phyboard-alcor.dts
+++ b/arch/arm/dts/imx6q-phytec-phyboard-alcor.dts
@@ -35,4 +35,5 @@
&usdhc3 {
status = "okay";
+ max-frequency = <25000000>; /* 25 Mhz */
};
diff --git a/arch/arm/dts/imx6qdl-phytec-phyboard-subra.dtsi b/arch/arm/dts/imx6qdl-phytec-phyboard-subra.dtsi
index 1efc632..a38765b 100644
--- a/arch/arm/dts/imx6qdl-phytec-phyboard-subra.dtsi
+++ b/arch/arm/dts/imx6qdl-phytec-phyboard-subra.dtsi
@@ -26,4 +26,5 @@
&usdhc3 {
status = "okay";
+ max-frequency = <25000000>; /* 25 Mhz */
};
--
1.9.1
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