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[PPC64] Enable phyp vty use as a GDB DBGPORT
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Authored by luporl on Oct 31 2019, 12:44 PM.
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Details

Summary

This change makes it possible to use a POWER Hypervisor virtual
terminal device (phyp vty) as a GDB debug port.

Similar to the uart debug port, it has to be enabled by setting
the hw.uart_phyp.dbgport variable to the vty node of the device
tree.

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Buildable 27295
Build 25555: arc lint + arc unit