Dell R730 console redirection

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gistfile1.txt

How to get console redirection working on a Dell R730 to ttya.

The above is for for legacy. The docs do state that SOL only works
for COM2.

Note this configures the SOL as ttya from the OS point of view!

Under UEFI
----------

Serial input doesn't seem to work in loader or iPXE. See
https://code.illumos.org/c/illumos-gate/+/210 which basically
falls back to legacy serial handling instead of trying to use the
EFI interfaces. This might fix it.

Making Device1=COM1,Device2=COM2 leads to doubling of output, and still no input.
See OS-7750

UEFI, Device1=COM1,Device2=COM2,External=Device2
------------------------------------------------

Double output in loader, input doesn't work. FIXME: is this ttya or ttyb
from OS's point of view?

UEFI, Device1=COM1,Device2=COM2,External=Device1
------------------------------------------------

This *should* be ttya, right? But input doesn't work, and when we boot into the OS
it's definitely considered ttyb.

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