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SD spec (section 6.4.1.3) requires VDD < 0.5V for minimum 1ms during power cycle. Measured discharge time on this board is ~632.97ms to reach < 0.5V threshold. During boot, MMC power cycles between boot stages. Without power off delay, VDD doesn't fully discharge. Card retains 1.8V signaling state from previous stages. When U-Boot initializes, card no longer asserts S18A in ACMD41 response (already switched to 1.8V). Host misinterprets card state and forces 1.8V anyway, falling into a bad state and causing a boot failure. Add power-off-delay-us = 650000 (650ms) to ensure proper VDD discharge during power cycles, allowing card to fully reset state between boot stages. Signed-off-by: Judith Mendez --- arch/arm64/boot/dts/ti/k3-am654-base-board.dts | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts index ca1300e130936..edcf039ccfbd0 100644 --- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts +++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts @@ -460,6 +460,7 @@ &sdhci0 { &sdhci1 { status = "okay"; vmmc-supply = <&vdd_mmc1_sd>; + power-off-delay-us = <650000>; pinctrl-names = "default"; pinctrl-0 = <&main_mmc1_pins_default>; ti,driver-strength-ohm = <50>; -- 2.34.1