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The .xrom prefix provides an experimental mechanism for loading ROM images greater than 64kB in size by mapping the expansion ROM BAR in at a hopefully-unused address. This is unreliable, and potentially dangerous. In particular, there is no guarantee that any PCI bridges between the CPU and the device will respond to accesses for the "unused" memory region that is chosen, and it is possible that the process of scanning for the "unused" memory region may end up issuing reads to other PCI devices. If this ends up trampling on a register with read side-effects belonging to an unrelated PCI device, this may cause undefined behaviour. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org