| # | |
| # Network configuration | |
| # | |
| menuconfig NET | |
| bool "Networking support" | |
| default y | |
| 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 README.NetConsole 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 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. |