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arm64: dts: amlogic: sm1-bananapi: lower SD card speed for stability

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Users report being able to boot (u-boot) from SD card but kernel
init then fails to mount partitions on the card containing boot
media resulting in first-boot failure. System logs show only the
probe of the mmc devices: the SD card is seen, but no partitions
are found so init fails to mount them and boot stalls.

Reducing the speed of the SD card from 50MHz to 35MHz results in
complete probing of the card and successful boot.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20250505143700.4029484-1-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Christian Hewitt
2025-05-05 14:37:00 +00:00
committed by Neil Armstrong
parent e97fdb9b8a
commit 916fa558cb
1 changed files with 2 additions and 3 deletions
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5
arch/arm64/boot/dts/amlogic/meson-sm1-bananapi.dtsi
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@@ -380,11 +380,10 @@ &sd_emmc_b {
bus-width = <4>;
cap-sd-highspeed;
max-frequency = <50000000>;
/* Boot failures are observed at 50MHz */
max-frequency = <35000000>;
disable-wp;
/* TOFIX: SD card is barely usable in SDR modes */
cd-gpios = <&gpio GPIOC_6 GPIO_ACTIVE_LOW>;
vmmc-supply = <&tflash_vdd>;
vqmmc-supply = <&vddio_c>;