From: Guo-Fu Tseng <cooldavid at cooldavid.org> Adding RX Checksum offload support. This patchset can also be found at: http://git.etherboot.org/?p=people/cooldavid/gpxe.git;a=shortlog;h=refs/heads/rxcsumoff Signed-off-by: Guo-Fu Tseng <cooldavid at cooldavid.org>