kern/47857: cgd needs to support underlying disk geometry

[Thomas Klausner <wiz%NetBSD.org@localhost>]

>Number:         47857
>Category:       kern
>Synopsis:       cgd needs to support underlying disk geometry
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 26 17:45:00 +0000 2013
>Originator:     Thomas Klausner
>Release:        NetBSD 6.99.20
>Organization:
Curiosity is the very basis of education and if you tell me that 
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:
        
        
System: NetBSD yt.nih.at 6.99.20 NetBSD 6.99.20 (KVOTHE) #8: Tue May 21 
17:48:10 CEST 2013 
wiz%yt.nih.at@localhost:/archive/foreign/src/sys/arch/amd64/compile/obj/KVOTHE 
amd64
Architecture: x86_64
Machine: amd64
>Description:
When creating a cgd on a dk that sits on top of a 4k-sectors-hard-disk,
cgd reports a virtual geometry of 512 bytes/sector instead.

Currently I don't even get a working disklabel on the disk, but
even if I would, it probably wouldn't work.
>How-To-Repeat:
Buy 4k-sectors-hard-disk, use gpt to add a cgd,
try to configure it.
>Fix:
Please.

>Unformatted: