[U-Boot] Moving MX25 to SPL

Hi all

I'm trying to figure out how move the mx25 to two stage boot using SPL. Anyone know why was done it before?

More technical question is if I can convert imximage.cfg value and let it write to an spl.c file that make the same. I don't have a lot of background on imx25 bootrom and what it's supporting. Can you some hint?

Michael