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arm: dts: rk3399-firefly: Reduce SD card speed for lab

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The Firefly-RK3399 board does not boot reliably in the SJG lab due
to signal-integrity issues with SD-wire adapters at higher speeds.

Reduce the SDMMC max-frequency to 25MHz and disable high-speed modes
to improve compatibility.

Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Simon Glass
2025-12-19 19:51:59 -07:00
parent cdd549ccc4
commit 17c5d8d110
1 changed files with 6 additions and 0 deletions
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6
arch/arm/dts/rk3399-firefly-u-boot.dtsi
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@@ -6,6 +6,12 @@
#include "rk3399-u-boot.dtsi"
#include "rk3399-sdram-ddr3-1600.dtsi"
&sdmmc {
max-frequency = <25000000>; /* 25MHz for SD-wire compatibility */
/delete-property/ cap-sd-highspeed;
/delete-property/ cap-mmc-highspeed;
};
&vdd_log {
regulator-init-microvolt = <950000>;
};