2 # Network configuration
6 bool "Networking support"
12 int "Milliseconds before trying ARP again"
15 config NET_RETRY_COUNT
16 int "Number of timeouts before giving up"
19 This variable defines the number of retries for network operations
20 like ARP, RARP, TFTP, or BOOTP before giving up the operation.
23 bool "Enable generic udp framework"
25 Enable a generic udp framework that allows defining a custom
26 handler for udp protocol.
28 config BOOTP_SEND_HOSTNAME
29 bool "Send hostname to DNS server"
31 Some DHCP servers are capable to do a dynamic update of a
32 DNS server. To do this, they need the hostname of the DHCP
34 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
35 of the "hostname" environment variable is passed as
36 option 12 to the DHCP server.
38 config NET_RANDOM_ETHADDR
39 bool "Random ethaddr if unset"
41 Selecting this will allow the Ethernet interface to function even
42 when the ethaddr variable for that interface is unset. In this case,
43 a random MAC address in the locally administered address space is
44 generated. It will be saved to the appropriate environment variable,
48 bool "NetConsole support"
50 Support the 'nc' input/output device for networked console.
51 See README.NetConsole for details.
54 bool "Support IP datagram reassembly"
56 Selecting this will enable IP datagram reassembly according
57 to the algorithm in RFC815.
60 int "Size of buffer used for IP datagram reassembly"
65 This defines the size of the statically allocated buffer
66 used for reassembly, and thus an upper bound for the size of
67 IP datagrams that can be received.
69 config SYS_FAULT_ECHO_LINK_DOWN
70 bool "Echo the inverted Ethernet link state to the fault LED"
72 Echo the inverted Ethernet link state to the fault LED. Note, if
73 this option is active, then CONFIG_SYS_FAULT_MII_ADDR also needs to
80 Default TFTP block size.
81 The MTU is typically 1500 for ethernet, so a TFTP block of
82 1468 (MTU minus eth.hdrs) provides a good throughput with
83 almost-MTU block sizes.
84 You can also activate CONFIG_IP_DEFRAG to set a larger block.
87 bool "Set TFTP UDP source/destination ports via the environment"
89 If this is defined, the environment variable tftpsrcp is used to
90 supply the TFTP UDP source port value. If tftpsrcp isn't defined,
91 the normal pseudo-random port number generator is used.
93 Also, the environment variable tftpdstp is used to supply the TFTP
94 UDP destination port value. If tftpdstp isn't defined, the normal
97 The purpose for tftpsrcp is to allow a TFTP server to blindly start
98 the TFTP transfer using the pre-configured target IP address and UDP
99 port. This has the effect of "punching through" the (Windows XP)
100 firewall, allowing the remainder of the TFTP transfer to proceed
101 normally. A better solution is to properly configure the firewall,
102 but sometimes that is not allowed.
104 config TFTP_WINDOWSIZE
105 int "TFTP window size"
108 Default TFTP window size.
109 RFC7440 defines an optional window size of transmits,
110 before an ack response is required.
111 The default TFTP implementation implies a window size of 1.
114 bool "Track TFTP transfers based on file size option"
115 depends on CMD_TFTPBOOT
116 default y if (ARCH_OMAP2PLUS || ARCH_K3)
118 By default, TFTP progress bar is increased for each received UDP
119 frame, which can lead into long time being spent for sending
120 data over the UART. Enabling this option, TFTP queries the file
121 size from server, and if supported, limits the progress bar to
122 50 characters total which fits on single line.
124 config SERVERIP_FROM_PROXYDHCP
125 bool "Get serverip value from Proxy DHCP response"
127 Allows bootfile config to be fetched from Proxy DHCP server
128 while IP is obtained from main DHCP server.
130 config SERVERIP_FROM_PROXYDHCP_DELAY_MS
131 int "# of additional milliseconds to wait for ProxyDHCP response"
134 Amount of additional time to wait for ProxyDHCP response after
135 receiving response from main DHCP server. Has no effect if
136 SERVERIP_FROM_PROXYDHCP is false.
138 config KEEP_SERVERADDR
139 bool "Write the server's MAC address to 'serveraddr'"
142 Keeps the server's MAC address, in the env 'serveraddr'
143 for passing to bootargs (like Linux's netconsole option). If this is
144 enabled, when an ARP reply is received, the server's IP address is
148 bool "Check the UDP checksum"
151 Enable this to verify the checksum on UDP packets. If the checksum
152 is wrong then the packet is discussed and an error is shown, like
153 "UDP wrong checksum 29374a23 30ff3826"
155 config BOOTP_SERVERIP
156 bool "Use the 'serverip' env var for tftp, not bootp"
158 Enable this if the TFTP server will be the 'serverip' environment
159 variable, not the BOOTP server. This affects the operation of both
164 config SYS_RX_ETH_BUFFER
165 int "Number of receive packet buffers"
168 Defines the number of Ethernet receive buffers. On some Ethernet
169 controllers it is recommended to set this value to 8 or even higher,
170 since all buffers can be full shortly after enabling the interface on
171 high Ethernet traffic.