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https://github.com/AsahiLinux/u-boot
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c8e251f82a
- ProxyDHCP allows a second DHCP server to exist alongside your main DHCP server and supply additional BOOTP related options - When u-boot sends out a DHCP request, the real DHCP server will respond with a normal response containing the new client IP address while simultaneously the ProxyDHCP server will respond with a blank client IP address and a `bootfile` option - This patch adds CONFIG_SERVERIP_FROM_PROXYDHCP (default false) to enable this behavior and CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS (default 100) which tells u-boot to wait additional time after receiving the main DHCP response to give the ProxyDHCP response time to arrive - The PXE spec for ProxyDHCP is more complicated than the solution added here as diagramed on page 16: http://www.pix.net/software/pxeboot/archive/pxespec.pdf: ``` DHCP Discover will be retried four times. The four timeouts are 4, 8, 16 and 32 seconds respectively. If a DHCPOFFER is received without an Option timeouts in an attempt to receive a PXE response. ``` - Adding a simple delay worked for my purposes but let me know if a more robust solution is required Signed-off-by: Lyle Franklin <lylejfranklin@gmail.com>
91 lines
2.5 KiB
Text
91 lines
2.5 KiB
Text
#
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# Network configuration
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#
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menuconfig NET
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bool "Networking support"
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default y
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if NET
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config PROT_UDP
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bool "Enable generic udp framework"
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help
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Enable a generic udp framework that allows defining a custom
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handler for udp protocol.
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config BOOTP_SEND_HOSTNAME
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bool "Send hostname to DNS server"
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help
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Some DHCP servers are capable to do a dynamic update of a
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DNS server. To do this, they need the hostname of the DHCP
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requester.
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If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
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of the "hostname" environment variable is passed as
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option 12 to the DHCP server.
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config NET_RANDOM_ETHADDR
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bool "Random ethaddr if unset"
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help
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Selecting this will allow the Ethernet interface to function
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even when the ethaddr variable for that interface is unset.
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A new MAC address will be generated on every boot and it will
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not be added to the environment.
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config NETCONSOLE
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bool "NetConsole support"
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help
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Support the 'nc' input/output device for networked console.
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See README.NetConsole for details.
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config IP_DEFRAG
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bool "Support IP datagram reassembly"
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default n
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help
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Selecting this will enable IP datagram reassembly according
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to the algorithm in RFC815.
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config NET_MAXDEFRAG
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int "Size of buffer used for IP datagram reassembly"
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depends on IP_DEFRAG
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default 16384
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range 1024 65536
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help
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This defines the size of the statically allocated buffer
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used for reassembly, and thus an upper bound for the size of
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IP datagrams that can be received.
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config TFTP_BLOCKSIZE
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int "TFTP block size"
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default 1468
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help
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Default TFTP block size.
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The MTU is typically 1500 for ethernet, so a TFTP block of
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1468 (MTU minus eth.hdrs) provides a good throughput with
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almost-MTU block sizes.
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You can also activate CONFIG_IP_DEFRAG to set a larger block.
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config TFTP_WINDOWSIZE
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int "TFTP window size"
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default 1
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help
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Default TFTP window size.
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RFC7440 defines an optional window size of transmits,
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before an ack response is required.
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The default TFTP implementation implies a window size of 1.
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config SERVERIP_FROM_PROXYDHCP
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bool "Get serverip value from Proxy DHCP response"
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help
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Allows bootfile config to be fetched from Proxy DHCP server
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while IP is obtained from main DHCP server.
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config SERVERIP_FROM_PROXYDHCP_DELAY_MS
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int "# of additional milliseconds to wait for ProxyDHCP response"
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default 100
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help
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Amount of additional time to wait for ProxyDHCP response after
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receiving response from main DHCP server. Has no effect if
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SERVERIP_FROM_PROXYDHCP is false.
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endif # if NET
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