port-i386/55036: biosboot can no longer recognize that i386 netbsd-GENERIC is multiboot

[jbryn%students.wcpss.net@localhost]

>Number:         55036
>Category:       port-i386
>Synopsis:       biosboot can no longer recognize that i386 netbsd-GENERIC is multiboot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 01 15:25:00 +0000 2020
>Originator:     Jackson Bryn
>Release:        9.0
>Organization:
N/A
>Environment:
N/A
>Description:
Appears to be that multiboot support was handled not very carefully over the past few years.

8.0's bootloader can multiboot 9.0 netbsd-GENERIC, but not when it comes to 9.0's bootloader itself. Unlike 8.0's bootloader, 9.0's spurts an "Unknown error: code 0" when trying to boot:

> multiboot netbsd
netbsd is not a multiboot kernel
multiboot: hd0a:netbsd: Unknown error: code 0

In the meantime, I'll be downgrading to 8.0's bootloader...
>How-To-Repeat:
> multiboot netbsd (netbsd-GENERIC!)
>Fix: