[U-Boot] altera socfpga: mmc boot fails as soon as I enable DEBUG

Hi!

With #define DEBUG disabled, u-boot can load kernel/dtb from the MMC card just fine. As soon as I enable DEBUG, boot fails, and not even hardware reset helps. (It looks like MMC card itself locks up). If I unplug/replug card _and_ reset, machine recovers.

This is on EBV socrates, but IIRC people seen it on sockit, too.

Any ideas what might be wrong?

Thanks, Pavel