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EISA expansion slot I/O port addresses overlap space that may be assigned to PCI devices, which can lead to register reads and writes with unwanted side effects during EISA probing. Reduce the chances of performing EISA probing on PCI devices by probing EISA slot vendor and product ID registers only if the EISA system board vendor ID register indicates that the motherboard supports EISA. Debugged-by: Václav Ovsík <vaclav.ovsik@gmail.com> Tested-by: Václav Ovsík <vaclav.ovsik@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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