As VPD support still causes hard hangs on boot with some hardware, add a tunable allowing automatic parsing of VPD data to be disabled.  The default is left as-is; if you are having problems with hard hangs at boot due to VPD, try setting hw.pci.enable_vpd=0.  A proper architectural solution has been under discussion for some time, but this allows me to boot my test machines in the mean time.
As VPD support still causes hard hangs on boot with some hardware, add a
tunable allowing automatic parsing of VPD data to be disabled.  The
default is left as-is; if you are having problems with hard hangs at boot
due to VPD, try setting hw.pci.enable_vpd=0.  A proper architectural
solution has been under discussion for some time, but this allows me to
boot my test machines in the mean time.

Submitted by:	bz
Head nod:	jmg

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