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To update the kernel command line, modify KERNEL_CMDLINE_EXTRA in meta-qcom/ci/base.yml to apply the change across all machines, or in the SoC-specific machine inclusion file (meta-qcom/conf/machine/include/qcom-<SoC>.inc) to apply it to a single target: 
KERNEL_CMDLINE_EXTRA:append = "console=ttyMSM0,115200n8 earlycon"