install/60360: sysinst: unpacking dtb set overflows the boot partition when provisioning new aarch64 VM

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>Number:         60360
>Category:       install
>Synopsis:       sysinst: unpacking dtb set overflows the boot partition when provisioning new aarch64 VM
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 24 01:25:00 +0000 2026
>Originator:     Alistair Crooks
>Release:        NetBSD-11.99.6 (from DAILY iso) 23-Jun-2026 19:53
>Organization:
None
>Environment:
Similar to: NetBSD agc-vm-20250222.localdomain 11.99.6 NetBSD 11.99.6 (GENERIC64) #0: Mon Jun 22 13:50:23 PDT 2026  agc@agc-vm-20250222.localdomain:/usr/build/obj/usr/src/sys/arch/evbarm/compile/GENERIC64 evbarm
>Description:
When unpacking all sets on aarch64 (in a Fusion VM), an attempt is made to unpack the dtb set, which overflows the boot partition (it seems to be 64 sectors by default). dtb isn't needed under Fusion.
>How-To-Repeat:
Unpack sets on aarch64 install via sysinst
>Fix:
Either don't automatically install dtb sets when not needed (which might be a tad difficult a priori), or make the /boot partition a tad larger