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Add a comment describing the 'fast path' that was introduced in r270011.

Description

Add a comment describing the 'fast path' that was introduced in r270011.

Reviewed by: kib
MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Details

Provenance
alcAuthored on
Reviewer
kib
Parents
rS303100: We will be switching to a new arm64 uart cpu driver that handles both FDT
Branches
Unknown
Tags
Unknown