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[romprefix] Display only one "Ctrl-B" prompt per PCI device during POST
If a multifunction PCI device exposes an iPXE ROM via each function, then each function will display a "Press Ctrl-B to configure iPXE" prompt, and delay for two seconds. Since a single instance of iPXE can drive all functions on the multifunction device, this simply adds unnecessary delay to the boot process. Fix by inhibiting the "Press Ctrl-B" prompt for all except the first function on a PCI device. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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