Linux/TDA2E: Error from SD card booting : mmc0: error -110 whilst initialising SD card

Hi Anand:
I ever met the related situations on our custom board. Please check your SD card power. These messages imply that your custom board SD power is not on, so you need to modify the Kernel Device Tree file according to your H/W to turn on the SD power when booting.

Regards,
/ckhsu

Hi CK Hsu,


Yes, I changed device tree file according to H/W.

I changed contain in dra72-evm-common.dtsi file:

&mmc1 {
status = "okay";

vmmc-supply = <&evm_3v3_sw>;
/* vmmc-supply = <&evm_3v3_sd>; */
vmmc_aux-supply = <&ldo1_reg>;
bus-width = <4>;
/*
* SDCD signal is not being used here - using the fact that GPIO mode
* is a viable alternative
*/
/*cd-gpios = <&gpio6 27 GPIO_ACTIVE_LOW>;*/
ti,non-removable;
max-frequency = <192000000>;
};

evm_3v3_sw: fixedregulator-evm_3v3 {
compatible = "regulator-fixed";
regulator-name = "evm_3v3";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
}

But i am getting error:

omap_hsmmc 4809c000.mmc: pbias set voltage failed
pbias_mmc_omap5: unsupportable voltage range: 3000000-1800000uV
omap_hsmmc 4809c000.mmc: pbias set voltage failed
omap_hsmmc 4809c000.mmc: failed to switch to 3.0V
omap_hsmmc 480d1000.mmc: no pinctrl state for hs mode


Please check files and help to solve issue.
Is it require any driver changes?

Thanks,
Anand Kumar

Hi Anand:
You should modify you sd-power according to the H/W, not just make it same as mmc2 in the DTS as EVM. This will not work if your H/W connect the power of the SD to other power source different from TI EVM.
Normally you should check your vmmc_aux-supply for mmc1 in your H/W to know where it is connected, and do the according modifications. Except for the vmmc_aux-supply, you should also check pbias-supply for the H/W, however this is often identical as EVM.

Regards,
/ckhsu