Help with getting the SD card to be tuned

Hello. I'm developing the Armbian image for roc-rk3328-cc Renegade, and so far things are moving forward. However, there is one thing that keeps causing trouble, and it is the SD card phase tuning. I can't get it to work like in the official Firefly images.

More specifically, in Firefly's image kern.log, I see the following line:
dwmmc_rockchip ff500000.dwmmc: Successfully tuned phase to 140

This line is not present in Armbian image. Can anybody give me a hint about what I am doing wrong? Thanks!

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