[U-Boot] AM335x: enabling datacache in SPL slows down system?

[Bas van den Berg]

I'm trying to optimize the boottime for an AM335x based board. Currently
we're loading the kernel from SPL directly (falcon mode). Loading the kernel
from flash to ram takes roughly 3 seconds.
When doing this from U-boot itself with 'nand read .., it only takes 1.8 seconds.
It seems that U-boot has data_cache enabled, while SPL did not.

When enabling the data cache with dcache_enable(), loading takes 3.5 seconds,
so even slower! The enabling itself does not take a significant amount of time.

Anyone have any idea why enabling the data cache slows SPL down?
Or does U-boot do anything else that I'm missing?

Bas