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[pci] Save and restore PCI command register
This seems to be necessary for some types of PCI devices. We had problems when using gPXE in KVM virtual machines with direct PCI device access. Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com> Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca> Modified-by: Marty Connor <mdc@etherboot.org> Signed-off-by: Marty Connor <mdc@etherboot.org>
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