# # Network configuration # menuconfig NET bool "Networking support" default y imply NETDEVICES if NET config ARP_TIMEOUT int "Milliseconds before trying ARP again" default 5000 config NET_RETRY_COUNT int "Number of timeouts before giving up" default 5 help This variable defines the number of retries for network operations like ARP, RARP, TFTP, or BOOTP before giving up the operation. config PROT_UDP bool "Enable generic udp framework" help Enable a generic udp framework that allows defining a custom handler for udp protocol. config BOOTDEV_ETH bool "Enable bootdev for ethernet" depends on BOOTSTD default y help Provide a bootdev for ethernet so that is it possible to boot an operationg system over the network, using the PXE (Preboot Execution Environment) protocol. config BOOTP_SEND_HOSTNAME bool "Send hostname to DNS server" help Some DHCP servers are capable to do a dynamic update of a DNS server. To do this, they need the hostname of the DHCP requester. If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content of the "hostname" environment variable is passed as option 12 to the DHCP server. config NET_RANDOM_ETHADDR bool "Random ethaddr if unset" help Selecting this will allow the Ethernet interface to function even when the ethaddr variable for that interface is unset. In this case, a random MAC address in the locally administered address space is generated. It will be saved to the appropriate environment variable, too. config NETCONSOLE bool "NetConsole support" help Support the 'nc' input/output device for networked console. See doc/usage/netconsole.rst for details. config IP_DEFRAG bool "Support IP datagram reassembly" help Selecting this will enable IP datagram reassembly according to the algorithm in RFC815. config NET_MAXDEFRAG int "Size of buffer used for IP datagram reassembly" depends on IP_DEFRAG default 16384 range 1024 65536 help This defines the size of the statically allocated buffer used for reassembly, and thus an upper bound for the size of IP datagrams that can be received. config SYS_FAULT_ECHO_LINK_DOWN bool "Echo the inverted Ethernet link state to the fault LED" help Echo the inverted Ethernet link state to the fault LED. Note, if this option is active, then CONFIG_SYS_FAULT_MII_ADDR also needs to be configured. config TFTP_BLOCKSIZE int "TFTP block size" default 1468 help Default TFTP block size. The MTU is typically 1500 for ethernet, so a TFTP block of 1468 (MTU minus eth.hdrs) provides a good throughput with almost-MTU block sizes. You can also activate CONFIG_IP_DEFRAG to set a larger block. config TFTP_PORT bool "Set TFTP UDP source/destination ports via the environment" help If this is defined, the environment variable tftpsrcp is used to supply the TFTP UDP source port value. If tftpsrcp isn't defined, the normal pseudo-random port number generator is used. Also, the environment variable tftpdstp is used to supply the TFTP UDP destination port value. If tftpdstp isn't defined, the normal port 69 is used. The purpose for tftpsrcp is to allow a TFTP server to blindly start the TFTP transfer using the pre-configured target IP address and UDP port. This has the effect of "punching through" the (Windows XP) firewall, allowing the remainder of the TFTP transfer to proceed normally. A better solution is to properly configure the firewall, but sometimes that is not allowed. config TFTP_WINDOWSIZE int "TFTP window size" default 1 help Default TFTP window size. RFC7440 defines an optional window size of transmits, before an ack response is required. The default TFTP implementation implies a window size of 1. config TFTP_TSIZE bool "Track TFTP transfers based on file size option" depends on CMD_TFTPBOOT default y if (ARCH_OMAP2PLUS || ARCH_K3) help By default, TFTP progress bar is increased for each received UDP frame, which can lead into long time being spent for sending data over the UART. Enabling this option, TFTP queries the file size from server, and if supported, limits the progress bar to 50 characters total which fits on single line. config SERVERIP_FROM_PROXYDHCP bool "Get serverip value from Proxy DHCP response" help Allows bootfile config to be fetched from Proxy DHCP server while IP is obtained from main DHCP server. config SERVERIP_FROM_PROXYDHCP_DELAY_MS int "# of additional milliseconds to wait for ProxyDHCP response" default 100 help Amount of additional time to wait for ProxyDHCP response after receiving response from main DHCP server. Has no effect if SERVERIP_FROM_PROXYDHCP is false. config KEEP_SERVERADDR bool "Write the server's MAC address to 'serveraddr'" default y if SANDBOX help Keeps the server's MAC address, in the env 'serveraddr' for passing to bootargs (like Linux's netconsole option). If this is enabled, when an ARP reply is received, the server's IP address is written there. config UDP_CHECKSUM bool "Check the UDP checksum" default y if SANDBOX help Enable this to verify the checksum on UDP packets. If the checksum is wrong then the packet is discarded and an error is shown, like "UDP wrong checksum 29374a23 30ff3826" config BOOTP_SERVERIP bool "Use the 'serverip' env var for tftp, not bootp" help Enable this if the TFTP server will be the 'serverip' environment variable, not the BOOTP server. This affects the operation of both bootp and tftp. config BOOTP_MAX_ROOT_PATH_LEN int "Option 17 root path length" default 64 help Select maximal length of option 17 root path. config USE_GATEWAYIP bool "Set a default 'gateway' value in the environment" help Defines a default value for the IP address of the default router where packets to other networks are sent to. (Environment variable "gatewayip") config GATEWAYIP string "Value of the default 'gateway' value in the environment" depends on USE_GATEWAYIP config USE_IPADDR bool "Set a default 'ipaddr' value in the environment" help Define a default value for the IP address to use for the default Ethernet interface, in case this is not determined through e.g. bootp. (Environment variable "ipaddr") config IPADDR string "Value of the default 'ipaddr' value in the environment" depends on USE_IPADDR config USE_NETMASK bool "Set a default 'netmask' value in the environment" help Defines a default value for the subnet mask (or routing prefix) which is used to determine if an IP address belongs to the local subnet or needs to be forwarded through a router. (Environment variable "netmask") config NETMASK string "Value of the default 'netmask' value in the environment" depends on USE_NETMASK config USE_ROOTPATH bool "Set a default 'rootpath' value in the environment" config ROOTPATH string "Value of the default 'rootpath' value in the environment" depends on USE_ROOTPATH default "/opt/nfsroot" config USE_SERVERIP bool "Set a default 'serverip' value in the environment" help Defines a default value for the IP address of a TFTP server to contact when using the "tftboot" command. (Environment variable "serverip") config SERVERIP string "Value of the default 'serverip' value in the environment" depends on USE_SERVERIP config PROT_TCP bool "TCP stack" help Enable a generic tcp framework that allows defining a custom handler for tcp protocol. config PROT_TCP_SACK bool "TCP SACK support" depends on PROT_TCP help TCP protocol with SACK. SACK means selective acknowledgements. By turning this option on TCP will learn what segments are already received. So that it improves TCP's retransmission efficiency. This option should be turn on if you want to achieve the fastest file transfer possible. config IPV6 bool "IPv6 support" help Enable IPv6 support. It includes Neighbour Discovery protocol, ICMPv6 and auxiliary stuff to make it work. Since it is enabled u-boot network subsystem can get and handle incoming packets and send packets through IPv6 network. It allows to use environment variables such as ip6addr, serverip6. If a u-boot command is capable to parse an IPv6 address and find it, it will force using IPv6 in the network stack. endif # if NET config SYS_RX_ETH_BUFFER int "Number of receive packet buffers" default 4 help Defines the number of Ethernet receive buffers. On some Ethernet controllers it is recommended to set this value to 8 or even higher, since all buffers can be full shortly after enabling the interface on high Ethernet traffic.