[patch] Disable bios probe if acpi is enabled

[Doug Ambrisko]

Sean Bruno writes:
| I'm noting that newer machines are completely hosed if we attempt to
| probe for bios values.  I'm proposing this change.
| 
| -bash-4.2$ p4 diff -du //depot/yahoo/ybsd_7/src/sys/i386/i386/bios.c
| --- //depot/yahoo/ybsd_7/src/sys/i386/i386/bios.c       2011-09-16
| 22:47:30.000000000 0000
| +++ /home/seanbru/ybsd_7/src/sys/i386/i386/bios.c       2011-09-16
| 22:47:30.000000000 0000
| @@ -84,6 +84,12 @@
|      char                       *p;
|      
|      /*
| +     * Don't do bios probing if acpi is enabled, its
| +     * pointless and breaks on newer systems
| +     */
| +    if (!resource_disabled("acpi", 0))
| +       return;
| +    /*
|       * BIOS32 Service Directory, PCI BIOS
|       */
| 

That seems reasonable to me.

Doug A.