kern/73251: GEOM_GPT only works with ACPI in the kernel, not as module

[Marcel Moolenaar]

Synopsis: GEOM_GPT only works with ACPI in the kernel, not as module

State-Changed-From-To: open->closed
State-Changed-By: marcel
State-Changed-When: Sun Oct 31 00:22:19 GMT 2004
State-Changed-Why: 
The problem described in this PR has nothing to do with ACPI and is not
even specific to GPT (except for the fact that it's currently only MBR
and GPT that can coexist). What is described is that GEOM does not allow
multiple slicers on a single provider. Both the MBR and GPT reside on
the same disk and GEOM will only create devices for one. There's however
a window in which all device special files exist: when no file system
has been mounted. As soon as a file system is mounted, the slicer under
which the file system is mounted survives. The other disappears.

As such, this PR describes a configuration problem caused by the use of
invalid options (like the -k option to gpt migrate). GPT can not be used
on a disk that already has a MBR, it is defined that way by the GPT
specification and we only allow it in FreeBSD for debugging purposes.


http://www.freebsd.org/cgi/query-pr.cgi?pr=73251