misc/59193: clear=0 in boot.cfg doesn't work with EFI evbarm

[lloyd%must-have-coffee.gen.nz@localhost]

>Number:         59193
>Category:       misc
>Synopsis:       clear=0 in boot.cfg doesn't work with EFI evbarm
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 17 22:30:00 +0000 2025
>Originator:     Lloyd Parkes
>Release:        10.99.12
>Organization:
>Environment:
NetBSD armv7 10.99.12 NetBSD 10.99.12 (GENERIC) #9: Sun Mar 16 10:35:15 NZDT 2025  lloyd%cartographer.must-have-coffee.gen.nz@localhost:/home/lloyd/NetBSD/build/hg/pinctrl2/objdir.evbarmv7-el/sys/arch/evbarm/compile/GENERIC evbarm
>Description:
On the evbarm platform the option to avoid clearing the screen doesn't work.

The NetBSD EFI bootloader unconditionally calls the EFI console reset function. The U-Boot EFI console code for the serial console has the obnoxious behaviour of clearing the screen and setting custom colours that the author thought were appropriate for my computer.

>How-To-Repeat:
Boot an evbarm system via EFI with clear=0 in boot.cfg.

>Fix:
Remove the console reset call from the NetBSD EFI bootloader. 

This will work fine on all evbarm with a serial console. 
I expect it to work fine on PCs.
Maybe it will work fine on evbarm systems with a graphical console.
Goodness only knows what will happen on a Mac.

These will all need to be tested.