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[romprefix] Avoid unaligned accesses within ROM headers
Ensure that all headers (PCI, UNDI, PnP, iPXE) are aligned to at least four bytes, so that all accesses to header fields will be correctly aligned even when reading directly from the expansion ROM BAR. Reported-by: Peter von Konigsmark <peter@exablaze.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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