• Benjamin Herrenschmidt's avatar
    powerpc/powernv: Support for OPAL console · daea1175
    Benjamin Herrenschmidt authored
    This adds a udbg and an hvc console backend for supporting a console
    using the OPAL console interfaces.
    
    On OPAL v1 we have hvc0 mapped to whatever console the system was
    configured for (network or hvsi serial port) via the service
    processor.
    
    On OPAL v2 we have hvcN mapped to the Nth console provided by OPAL
    which generally corresponds to:
    
    	hvc0 : network console (raw protocol)
    	hvc1 : serial port S1 (hvsi)
    	hvc2 : serial port S2 (hvsi)
    
    Note: At this point, early debug console only works with OPAL v1
    and shouldn't be enabled in a normal kernel.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    daea1175
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