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[romprefix] On a PCI3.0, non-BBS system, use the correct %cs for INT19
On a system that doesn't support BBS, we end up hooking INT19 to gain control of the boot process. If the system is PCI3.0, we must take care to use the runtime value for %cs, rather than the POST-time value, otherwise we end up pointing INT19 to the temporary option ROM POST scratch area.
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Michael Brown
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Aug 22, 2008
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