xen: make early console also write to debug console
When using "earlyprintk=xen", also write the console output to the raw debug console. This will appear on dom0's console if the hypervisor has been compiled to allow it. Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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