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How to enable early printk
Early printk can only be enabled if debug=y. You may want to enable it if
you are debbuging code that executes before the console is initialized.
Note that selecting this option will limit Xen to a single UART definition.
Attempting to boot Xen image on a different platform *will not work*, so this
option should not be enable for Xens that are intended to be portable.
CONFIG_EARLY_PRINTK=mach
where mach is the name of the machine:
- vexpress: printk with pl011 for versatile express
By default early printk is disabled.
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