AM625: AM6251 error security

Hi Rodolfo,
Have we tested booting u-boot from other boot mode other than DFU on your board?
Best,
-Hong

Yes of course, uart boot but the result is the same

Hi Rodolfo,

Have we passed the "tispl.bin" authentication stage in any test run on your board?

If not, there's a hypothesis that DDR configuration is not stable on your board.
One option to confirm the hypothesis is running the "tispl.bin" on TI AM62-SK board if available.

Best,
-Hong

I managed to get past the authentication step, but now I'm stuck here:

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 ###


Regarding the node:
 
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>;
disable-wp;
no-1-8-v;
};

the pin mux:

main_mmc1_pins_default: main-mmc1-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x23c, PIN_INPUT, 0) /* (A21/C18) MMC1_CMD */
AM62X_IOPAD(0x234, PIN_OUTPUT, 0) /* (B22/A20) MMC1_CLK */
AM62X_IOPAD(0x230, PIN_INPUT, 0) /* (A22/A19) MMC1_DAT0 */
AM62X_IOPAD(0x22c, PIN_INPUT, 0) /* (B21/B19) MMC1_DAT1 */
AM62X_IOPAD(0x228, PIN_INPUT, 0) /* (C21/B20) MMC1_DAT2 */
AM62X_IOPAD(0x224, PIN_INPUT, 0) /* (D22/C19) MMC1_DAT3 */
AM62X_IOPAD(0x240, PIN_INPUT, 0) /* (D17/C15) MMC1_SDCD */
>;
};

The custom board is powered by the fixed SD card slot; the power supply cannot be switched. Additionally, both the power supply and the logic operate at 3.3V. I've already tried disabling both power supplies—one at a time—but the errors remain the same regardless of which one is disabled.

The RAM preloads are initialized in the common-uboot dtsi files.

I don't know what else to try now. Also, tiboot3.bin, tispl.bin, and uboot.img loaded without any problems from usb-dfu until I reached the u-boot console.

U-Boot 2023.04-gad06c182a6 (Mar 15 2026 - 16:07:29 +0000)

SoC: AM62X SR1.0 HS-FS
Model: Teceng AM625 CMI
EEPROM not available at 80, trying to read at 81
Reading on-board EEPROM at 0x51 failed -121
DRAM: no bloblist found!512 MiB
Core: 58 devices, 28 uclasses, devicetree: separate
MMC: mmc@fa10000: 0, mmc@fa00000: 1
Loading Environment from nowhere... OK
In: serial
Out: serial
Err: serial
Timed out in wait_for_event: status=0000
Check if pads/pull-ups of bus are properly configured
EEPROM not available at 80, trying to read at 81
Timed out in wait_for_event: status=0000
Check if pads/pull-ups of bus are properly configured
Reading on-board EEPROM at 0x51 failed -121
Net: am65_cpsw_nuss_port ethernet@8000000port@1: Invalid PHY mode, port 1
am65_cpsw_nuss_port ethernet@8000000port@2: Invalid PHY mode, port 2
No ethernet found.

Hit any key to stop autoboot: 0
=> fdt print /model
No FDT memory address configured. Please configure
the FDT address via "fdt addr <address>" command.
Aborting!
=> mmc list
mmc@fa10000: 0
mmc@fa00000: 1
=> mmc dev 0
Card did not respond to voltage select! : -110
=> mmc dev 1
Card did not respond to voltage select! : -110

Rodolfo Pereyro said:

Card did not respond to voltage select! : -110

The error message is most likely triggered when switching from 3.3V to 1.8V for high-speed data transfers, UHS-I (i.e. SDR50, SDR104 modes).

Let me pass the ticket to my colleague to follow up the SD voltage switch (CMD11) issue.

Best,
-Hong