AM625: Linux eMMC flashing using SD card on an AM62x-SK E2 board

Dear Bin ,

Thanks for your answers . Another Question  is  I could't find out the eMMC from my own design EVM . The correct AM625 EVM shows below correct  messages 

and my EVM shows as below , Did I lose any processs ?

Hi Jack,

Missing those mmc0 messages means the eMMC on your board is not detected in Linux. Please first review the eMMC hardware design on your board to see if there is any hardware related mistake. Then check your kernel board device tree to ensure the mmc0/eMMC pinmux has been set correctly and the sdhci0 node has been defined properly.

Dear Bin ,

1. The attached is my schematic emmc flash.pdf  , please help check . By the way , the error message is shown below:

I have test the SOC_MMC0_CMD signal , it has timing output meant to access eMMC chip .

Jack Wang

7450.emmc flash.pdf

Hi Jack,

Can you please try to add "no-1-8-v;" property to &sdhci0 node in your board device tree file and boot from the SD card to see if the kernel boot log shows more messages for the eMMC?

Dear Bin ,

After adding  "no-1-8-v;" , it showed as below . The eMMC controller could be detected , but the memory size was nothing.

Hi Jack,

The kernel log doesn't show the eMMC is detected.

Have you probed the eMMC pins to ensure the waveform looks correct?

Please attach your kernel device tree file showing your eMMC pinmux.

Dear Bin ,

1. Please see the attached file .

2. I have reviewed the schematic and VCC_3V3_SYS & VCC_1V8 powers are  correct . the MMC0_CLK & SOC_MMC0_CMD have outputs , the MMC0_CMD seems like running , however  , the data bus didnt have any timing output . Please see below attached files . Does the eMMC needs to be partition or format first ?

8345.eMMC.pdf

Jack Wang

Dear Bin ,

any comments ?

Jack Wang

Can anyone help me ?