[iMX6UL] Failed to flash image in eMMC

[john2207]

Hi,

We are trying to flash the image into eMMC in ourcustom board (CPU - i.MX6UL) using UUU utility. We are able to flash u-boot separately and able to access the u-boot console. 

But when we try to flash the complete image (.wic.bz2) , the UUU utility got killed at host side (~ 11 % - 15 % flashing done.). Then the target board was not detected as USB device. 

We suspect that some part of DDR not initialized properly and we ran DDR calibration test in our board. We have updated the calibration result values in uboot code (board/freescale/mx6ul_14x14_evk/imximage.cfg)  and tried to flash full image, still we couldn't able to update the image.

Herewith, we have attached the flashing error logs for Host and target board and DDR calibration results

If you need any inputs, please let us know. Please help us to solve this issue.

FYI : the same image , we are able to flash into i.MX6 UL EVK board using UUU.

command used : sudo ./uuu -b emmc_all   *.imx    *.wic.bz2 

[jimmychan]

It seems is the DDR issue. The following is the porting guide and design checklist.

For your reference:

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Freescale-i-MX6-DRAM-Port-Application-Gu...

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6UL-Hardware-design-checklist/ta-p/1...

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-6-7-DDR-Stress-Test-Tool/ta-p/11082...

[john2207]

Hi,

Thanks for your suggestion. We found the issue and its related to Host PC RAM.

UUU tool using high memory while flashing. So it got hanged. After changing to 4 GB RAM it works fine.