[PATCH 7/8] tty/serial: add arm64 semihosting earlycon

[Arnd Bergmann]

On Sunday 23 March 2014 16:04:41 Nicolas Pitre wrote:
> On Fri, 21 Mar 2014, Rob Herring wrote:
> 
> > From: Rob Herring <robh at kernel.org>
> > 
> > Add earlycon support for the arm64 semihosting debug serial interface.
> > This allows enabling a debug console when early_params are processed.
> > This is based on the arm64 earlyprintk smh support and is intended to
> > replace it.
> > 
> > This is named arm rather than arm64 in hopes it will be used for both,
> > but only arm64 is supported ATM.
> 
> It can't be used for both as the semihosting calls themselves need 
> assembly code and this is not compatible with the equivalent ARM32 
> calls.  So I'd suggest naming this "arm64" to avoid potential confusion.

How about using an compile-time conditional to put both inline assemblies
in there? While the driver is rather trivial to start with, I don't see
a point in duplicating it either.

	Arnd