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When running the 64-bit BIOS version of iPXE, restrict external memory allocations to the low 4GB to ensure that allocations (such as for initrds) fall within our identity-mapped memory region, and will be accessible to the potentially 32-bit operating system. Move largest_memblock() back to memtop_umalloc.c, since this change imposes a restriction that applies only to BIOS builds. 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