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If you select this option, you need to select
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"Trace data router for MIPI P1149.7 cJTAG standard".
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config PPC_EPAPR_HV_BYTECHAN
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tristate "ePAPR hypervisor byte channel driver"
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This driver creates /dev entries for each ePAPR hypervisor byte
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channel, thereby allowing applications to communicate with byte
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channels as if they were serial ports.
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config PPC_EARLY_DEBUG_EHV_BC
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bool "Early console (udbg) support for ePAPR hypervisors"
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depends on PPC_EPAPR_HV_BYTECHAN
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Select this option to enable early console (a.k.a. "udbg") support
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via an ePAPR byte channel. You also need to choose the byte channel
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config PPC_EARLY_DEBUG_EHV_BC_HANDLE
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int "Byte channel handle for early console (udbg)"
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depends on PPC_EARLY_DEBUG_EHV_BC
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If you want early console (udbg) output through a byte channel,
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specify the handle of the byte channel to use.
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For this to work, the byte channel driver must be compiled
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in-kernel, not as a module.
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Note that only one early console driver can be enabled, so don't
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enable any others if you enable this one.
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If the number you specify is not a valid byte channel handle, then
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there simply will be no early console output. This is true also
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if you don't boot under a hypervisor at all.