AM625: What is the SW procedure for a new eMMC (not being format and partition yet) on Custom Am62x Board ?

Hi Jack,

Sorry for my late response.

No, you don't need to format or partition the eMMC first for it to get enumerated in Linux.

Does the eMMC get detected in U-Boot? Please try the following U-Boot commands:

=> mmc list
=> mmc dev 0
=> mmc info

to see if you can see the eMMC info in U-Boot.

Dear Bin ,

please see the log as the attachment . AM62x EVM used MTFC16GAPALBH-IT type of eMMC and my custom Board uses  MTFC16GAPALBH-AAT .

Does it  need do any change on U-boot setting for the different type of number ?

Jack Wang

=> mmc list
mmc@fa10000: 0
mmc@fa00000: 1
mmc@fa20000: 2
=> mmc dev 0
Card did not respond to voltage select! : -110
=> mmc info
Card did not respond to voltage select! : -110
=> mmc part
Card did not respond to voltage select! : -110
=>

Hi Jack,

I am not sure what causes the -110 error, but does your board eMMC circuit support switching to 1.8v?

Dear Bin ,

My circuit always supports two power sources with 3.3V & 1.8V . What is the mean switching to 1,8V ? does it only can power one power source ?

The attached is my schematic .0257.eMMC.pdf

Dear Bin ,

One more thing , my SDK version is  04.01.03 and my custom design is based on PROC142E1 with PMIC , is it ok ?

Jack Wang

Hi Jack,

Sorry, please ignore my comment above about 3.3v vs 1.8v. Somehow I mixed it up with SD card...

I will look into it more next week to see if I can find something.

Dear Bin ,

I found the problem is  "cmd1 with the reply always showing bit 31 of OCR as busy (0)" ,it detected the power failed .

The eMMC part is connected to 3V3 for VCC and VCCQ at 1V8 with power rails measured at 3.32 and 1.81V . Does have the power sequence for  3.32 and 1.81V ? or PMIC problem ?

Jack Wang

Hi Jack,

Sorry for my late response.

Can you please add 'no-1-8-v;' in the &sdhci0 node in your board dts file to see if the eMMC can be enumerated in kenrel? This DT property disables eMMC HS modes.