Specify PCI based UART for earlyprintk
Add support for specifying PCI based UARTs for earlyprintk using a syntax like "earlyprintk=pciserial,00:18.1,115200", where 00:18.1 is the BDF of a UART device. [Slightly tidied from Stuart's original patch] Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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