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When we boot from a DHCP-supplied filename, we previously relied on the fact that the current working URI is set to tftp://[next-server]/ in order to resolve the filename into a full tftp:// URI. However, this process will eliminate the distinction between filenames with and without initial slashes: cwuri="tftp://10.0.0.1/" filename="vmlinuz" => URI="tftp://10.0.0.1/vmlinuz" cwuri="tftp://10.0.0.1/" filename="/vmlinuz" => URI="tftp://10.0.0.1/vmlinuz" This distinction is important for some TFTP servers. We now explicitly construct a string of the form "tftp://[next-server]/filename" so that a filename with an initial slash will result in a URI containing a double-slash, e.g. "tftp://10.0.0.1//vmlinuz" The TFTP code always strips a single initial slash, and so ends up presenting the correct path to the server. URIs entered explicitly by users at the command line must include a double slash if they want an initial slash presented to the TFTP server: "kernel tftp://10.0.0.1/vmlinuz" => filename="vmlinuz" "kernel tftp://10.0.0.1//vmlinuz" => filename="/vmlinuz"