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Some machines (observed with an AWS EC2 m7a.large instance) will place the ECAM configuration space window above 4GB, thereby making it unreachable from non-paged 32-bit code. This problem is currently ignored by iPXE, since the address is silently truncated in the call to ioremap(). (Note that other uses of ioremap() are not affected since the PCI core will already have checked for unreachable 64-bit BARs when retrieving the physical address to be mapped.) Fix by adding an explicit check that the region to be mapped starts within the reachable memory address space. (Assume that no machines will be sufficiently peverse to provide a region that straddles the 4GB boundary.) 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