Uboot itself does not have an option to change the CPU clock frequency. Thus, it starts at the default CPU core clock frequency of 800MHz that can be further changed at the kernel boot stage by the CPUFREQ driver setup. If you need to change the CPU core clock frequency in Uboot, you have to patch the Uboot code. For that purpose, you can use the CPUFREQ driver code as the reference. For details on the driver, please refer to the Section 2.3.3 of the attached document.
Have a great day,
Artur
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