Fallback to DBG2 if SPCR is not present while discovering UART serial
devices. DBG2 is newer than SPCR but does not provide the same
information, and it appears that both can exist on the same system.
This has only been tested in Hyper-V which exposes DBG2.
Change-Id: I6a75114f4287b6db289b544c3b80a66a625fb6c6
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10354
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Adrien Destugues <[email protected]>
John Davis
05d6e44fc9