[U-Boot] [PATCH 4/4 v4] Preventing needless switching on and off PLL bypass mode, allowing allow single-stepping through the SPL

[Robert Deliën]

> 1. Switch P_CLK to XTAL;
> 2. Check power source, if there is battery available, we switch back to PLL and make CPU running @ full
>  speed, and power is sourced from battery;
> 3. If battery is not available, and the power supply is from USB host, then we let CPU running @ XTAL
> until booting up kernel and USB driver enum done, then switch to PLL.

I fully agree.