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AM625: No boot to SD - AM625

Rodolfo Pereyro
Prodigy 70 points

Part Number: AM625

hi everyone,

I'm having the following problem: I'm trying to boot my custom board from a boot SD card, but it fails when the power is switched on, since I haven't configured it that way because the power supply is fixed.

U-Boot SPL 2023.04-gecb9410b72 (Mar 15 2026 - 21:21:07 +0000)
SYSFW ABI: 3.1 (firmware rev 0x0009 '9.1.8--v09.01.08 (Kool Koala)')
k3_ddrss_probe(dev=43c34bcc)
k3_ddrss_ofdata_to_priv(dev=43c34bcc)
k3_ddrss memorycontroller@f300000: ddr freq0 not populated, using bypass frequency.
k3_ddrss_power_on(ddrss=43c3a4c0)
k3_ddrss memorycontroller@f300000: vtt-supply not found.
k3_lpddr4_probe: PASS
k3_lpddr4_init: PASS
--->>> LPDDR4 Initialization is in progress ... <<<---
k3_lpddr4_start: Post start PASS
SPL initial stack usage: 13408 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.9(release):v2.9.0-614-gd7a7135d3-dirty
NOTICE:  BL31: Built : 09:34:15, Aug 24 2023

U-Boot SPL 2023.04-gecb9410b72 (Mar 15 2026 - 21:21:07 +0000)
SYSFW ABI: 3.1 (firmware rev 0x0009 '9.1.8--v09.01.08 (Kool Koala)')
SPL initial stack usage: 1856 bytes
Card did not respond to voltage select! : -110
** Bad device specification mmc 1 **
Couldn't find partition mmc 1:1
Error: could not access storage.
Trying to boot from MMC2
Card did not respond to voltage select! : -110
spl: mmc init failed with error: -95
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###


As for the hardware, the power supply for both the I/O and VCC pins of the SD card is a constant 3.3V.

These are the pull-ups:

image.png

Regarding the DT and DTsi files in $path-ti-u-boot/ for the custom board:

1) k3-am625-customboard.dts:

/{

vdd_mmc1: regulator-sd {
compatible = "regulator-fixed";
regulator-name = "vdd_mmc1";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
regulator-boot-on;
};
};

 



&sdhci1 {
    /* SD/MMC */
    status = "okay";
    vmmc-supply = <&vdd_mmc1>;
    // vqmmc-supply = <&vdd_sd_dv>;
    pinctrl-names = "default";
    pinctrl-0 = <&main_mmc1_pins_default>;
    ti,driver-strength-ohm = <50>;
    bus-width = <4>;
    broken-cd;
    disable-wp;
    no-1-8-v;
    bootph-pre-ram;
};

&main_pmx0 {
main_mmc1_pins_default: main-mmc1-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x23c, PIN_INPUT, 0) /* (A21) MMC1_CMD */
AM62X_IOPAD(0x234, PIN_OUTPUT, 0) /* (B22) MMC1_CLK */
AM62X_IOPAD(0x230, PIN_INPUT, 0) /* (A22) MMC1_DAT0 */
AM62X_IOPAD(0x22c, PIN_INPUT, 0) /* (B21) MMC1_DAT1 */
AM62X_IOPAD(0x228, PIN_INPUT, 0) /* (C21) MMC1_DAT2 */
AM62X_IOPAD(0x224, PIN_INPUT, 0) /* (D22) MMC1_DAT3 */
AM62X_IOPAD(0x240, PIN_INPUT, 0) /* (D17) MMC1_SDCD */
>;
};
};

2) k3-am625-customboard-u-boot.dtsi:

&main_mmc1_pins_default{
bootph-pre-ram;
};

&sdhci1{
bootph-pre-ram;
}

&vdd_mmc1{
bootph-pre-ram;
};

// &vdd_sd_dv {
// bootph-pre-ram;
// };

I tried running vdd_mmc1 and vdd_sd_dv separately and together, but the error persists.

From USB-DFU, I reach the u-boot console/prompt, but with the SD card, it gets stuck at the login screen shown here, even though I'm using the same tiboot3.bin, tispl.bin, and u-boot.img files.