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Device trees should specify `clock-frequency` property for `/cpus/cpu*` nodes

Goal

QEMU should generate spec-compliant device trees.

Technical details

According to the device tree specification, clock-frequency is a required property for all /cpus/cpu* nodes. For ARM and RISC-V virt boards (and possibly others), this property is not being generated in create_fdt.

Edited by Ghost User
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