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[dhcp] Honor PXEBS_SKIP option in discovery control
It is permissible for a DHCP packet containing PXE options to specify only "discovery control", instead of the more typical boot menu + prompt options. This is the strategy used by older versions of dnsmasq; by specifying the discovery control as PXEBS_SKIP, they cause vendor PXE ROMs to ignore boot server discovery and just use the filename and next-server options in the initial (Proxy)DHCP packet. Modify iPXE to accept this behavior, to be more compatible with the Intel firmware. Signed-off-by: Joshua Oreman <oremanj@rwcr.net> Tested-by: Kyle Kienapfel <kyle@shadowmage.org> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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