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The PXE TFTP API allows the caller to request a particular TFTP block size. Since mid-2008, iPXE has appended a "?blksize=xxx" parameter to the TFTP URI constructed internally; nothing has ever parsed this parameter. Nobody seems to have cared that this parameter has been ignored for almost five years. Fix by using xfer_window(), which provides a fairly natural way to convey the block size information from the PXE TFTP API to the TFTP protocol layer. Signed-off-by: Michael Brown <mcb30@ipxe.org>