[U-Boot] mx28: disable DCDC-converter and use internal linear regulators

Hello,

I'm having a problem with the internal DCDC-converter on a custom board. I'm now looking for a way to disable the internal DCDC-converter and use the internal regulators to power the CPU and memories. If I understand it correctly the pmu is configured in arch/arm/cpu/arm926ejs/mxs/spl_power_init.c.

How do I disable the internal DCDC-converter and use internal linear regulator instead?