1# 2# Network configuration 3# 4 5menuconfig NET 6 bool "Networking support" 7 default y 8 imply NETDEVICES 9 10if NET 11 12config ARP_TIMEOUT 13 int "Milliseconds before trying ARP again" 14 default 5000 15 16config NET_RETRY_COUNT 17 int "Number of timeouts before giving up" 18 default 5 19 help 20 This variable defines the number of retries for network operations 21 like ARP, RARP, TFTP, or BOOTP before giving up the operation. 22 23config PROT_UDP 24 bool "Enable generic udp framework" 25 help 26 Enable a generic udp framework that allows defining a custom 27 handler for udp protocol. 28 29config BOOTDEV_ETH 30 bool "Enable bootdev for ethernet" 31 depends on BOOTSTD 32 default y 33 help 34 Provide a bootdev for ethernet so that is it possible to boot 35 an operationg system over the network, using the PXE (Preboot 36 Execution Environment) protocol. 37 38config BOOTP_SEND_HOSTNAME 39 bool "Send hostname to DNS server" 40 help 41 Some DHCP servers are capable to do a dynamic update of a 42 DNS server. To do this, they need the hostname of the DHCP 43 requester. 44 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content 45 of the "hostname" environment variable is passed as 46 option 12 to the DHCP server. 47 48config NET_RANDOM_ETHADDR 49 bool "Random ethaddr if unset" 50 help 51 Selecting this will allow the Ethernet interface to function even 52 when the ethaddr variable for that interface is unset. In this case, 53 a random MAC address in the locally administered address space is 54 generated. It will be saved to the appropriate environment variable, 55 too. 56 57config NETCONSOLE 58 bool "NetConsole support" 59 help 60 Support the 'nc' input/output device for networked console. 61 See doc/usage/netconsole.rst for details. 62 63config IP_DEFRAG 64 bool "Support IP datagram reassembly" 65 help 66 Selecting this will enable IP datagram reassembly according 67 to the algorithm in RFC815. 68 69config NET_MAXDEFRAG 70 int "Size of buffer used for IP datagram reassembly" 71 depends on IP_DEFRAG 72 default 16384 73 range 1024 65536 74 help 75 This defines the size of the statically allocated buffer 76 used for reassembly, and thus an upper bound for the size of 77 IP datagrams that can be received. 78 79config SYS_FAULT_ECHO_LINK_DOWN 80 bool "Echo the inverted Ethernet link state to the fault LED" 81 help 82 Echo the inverted Ethernet link state to the fault LED. Note, if 83 this option is active, then CONFIG_SYS_FAULT_MII_ADDR also needs to 84 be configured. 85 86config TFTP_BLOCKSIZE 87 int "TFTP block size" 88 default 1468 89 help 90 Default TFTP block size. 91 The MTU is typically 1500 for ethernet, so a TFTP block of 92 1468 (MTU minus eth.hdrs) provides a good throughput with 93 almost-MTU block sizes. 94 You can also activate CONFIG_IP_DEFRAG to set a larger block. 95 96config TFTP_PORT 97 bool "Set TFTP UDP source/destination ports via the environment" 98 help 99 If this is defined, the environment variable tftpsrcp is used to 100 supply the TFTP UDP source port value. If tftpsrcp isn't defined, 101 the normal pseudo-random port number generator is used. 102 103 Also, the environment variable tftpdstp is used to supply the TFTP 104 UDP destination port value. If tftpdstp isn't defined, the normal 105 port 69 is used. 106 107 The purpose for tftpsrcp is to allow a TFTP server to blindly start 108 the TFTP transfer using the pre-configured target IP address and UDP 109 port. This has the effect of "punching through" the (Windows XP) 110 firewall, allowing the remainder of the TFTP transfer to proceed 111 normally. A better solution is to properly configure the firewall, 112 but sometimes that is not allowed. 113 114config TFTP_WINDOWSIZE 115 int "TFTP window size" 116 default 1 117 help 118 Default TFTP window size. 119 RFC7440 defines an optional window size of transmits, 120 before an ack response is required. 121 The default TFTP implementation implies a window size of 1. 122 123config TFTP_TSIZE 124 bool "Track TFTP transfers based on file size option" 125 depends on CMD_TFTPBOOT 126 default y if (ARCH_OMAP2PLUS || ARCH_K3) 127 help 128 By default, TFTP progress bar is increased for each received UDP 129 frame, which can lead into long time being spent for sending 130 data over the UART. Enabling this option, TFTP queries the file 131 size from server, and if supported, limits the progress bar to 132 50 characters total which fits on single line. 133 134config SERVERIP_FROM_PROXYDHCP 135 bool "Get serverip value from Proxy DHCP response" 136 help 137 Allows bootfile config to be fetched from Proxy DHCP server 138 while IP is obtained from main DHCP server. 139 140config SERVERIP_FROM_PROXYDHCP_DELAY_MS 141 int "# of additional milliseconds to wait for ProxyDHCP response" 142 default 100 143 help 144 Amount of additional time to wait for ProxyDHCP response after 145 receiving response from main DHCP server. Has no effect if 146 SERVERIP_FROM_PROXYDHCP is false. 147 148config KEEP_SERVERADDR 149 bool "Write the server's MAC address to 'serveraddr'" 150 default y if SANDBOX 151 help 152 Keeps the server's MAC address, in the env 'serveraddr' 153 for passing to bootargs (like Linux's netconsole option). If this is 154 enabled, when an ARP reply is received, the server's IP address is 155 written there. 156 157config UDP_CHECKSUM 158 bool "Check the UDP checksum" 159 default y if SANDBOX 160 help 161 Enable this to verify the checksum on UDP packets. If the checksum 162 is wrong then the packet is discarded and an error is shown, like 163 "UDP wrong checksum 29374a23 30ff3826" 164 165config BOOTP_SERVERIP 166 bool "Use the 'serverip' env var for tftp, not bootp" 167 help 168 Enable this if the TFTP server will be the 'serverip' environment 169 variable, not the BOOTP server. This affects the operation of both 170 bootp and tftp. 171 172config BOOTP_MAX_ROOT_PATH_LEN 173 int "Option 17 root path length" 174 default 64 175 help 176 Select maximal length of option 17 root path. 177 178config USE_GATEWAYIP 179 bool "Set a default 'gateway' value in the environment" 180 help 181 Defines a default value for the IP address of the default router 182 where packets to other networks are sent to. (Environment variable 183 "gatewayip") 184 185config GATEWAYIP 186 string "Value of the default 'gateway' value in the environment" 187 depends on USE_GATEWAYIP 188 189config USE_IPADDR 190 bool "Set a default 'ipaddr' value in the environment" 191 help 192 Define a default value for the IP address to use for the default 193 Ethernet interface, in case this is not determined through e.g. 194 bootp. (Environment variable "ipaddr") 195 196config IPADDR 197 string "Value of the default 'ipaddr' value in the environment" 198 depends on USE_IPADDR 199 200config USE_NETMASK 201 bool "Set a default 'netmask' value in the environment" 202 help 203 Defines a default value for the subnet mask (or routing prefix) which 204 is used to determine if an IP address belongs to the local subnet or 205 needs to be forwarded through a router. (Environment variable "netmask") 206 207config NETMASK 208 string "Value of the default 'netmask' value in the environment" 209 depends on USE_NETMASK 210 211config USE_ROOTPATH 212 bool "Set a default 'rootpath' value in the environment" 213 214config ROOTPATH 215 string "Value of the default 'rootpath' value in the environment" 216 depends on USE_ROOTPATH 217 default "/opt/nfsroot" 218 219config USE_SERVERIP 220 bool "Set a default 'serverip' value in the environment" 221 help 222 Defines a default value for the IP address of a TFTP server to 223 contact when using the "tftboot" command. (Environment variable 224 "serverip") 225 226config SERVERIP 227 string "Value of the default 'serverip' value in the environment" 228 depends on USE_SERVERIP 229 230config PROT_TCP 231 bool "TCP stack" 232 help 233 Enable a generic tcp framework that allows defining a custom 234 handler for tcp protocol. 235 236config PROT_TCP_SACK 237 bool "TCP SACK support" 238 depends on PROT_TCP 239 help 240 TCP protocol with SACK. SACK means selective acknowledgements. 241 By turning this option on TCP will learn what segments are already 242 received. So that it improves TCP's retransmission efficiency. 243 This option should be turn on if you want to achieve the fastest 244 file transfer possible. 245 246config IPV6 247 bool "IPv6 support" 248 help 249 Enable IPv6 support. It includes Neighbour Discovery protocol, ICMPv6 250 and auxiliary stuff to make it work. Since it is enabled u-boot 251 network subsystem can get and handle incoming packets and send packets 252 through IPv6 network. It allows to use environment variables such as 253 ip6addr, serverip6. If a u-boot command is capable to parse an IPv6 254 address and find it, it will force using IPv6 in the network stack. 255 256endif # if NET 257 258config SYS_RX_ETH_BUFFER 259 int "Number of receive packet buffers" 260 default 4 261 help 262 Defines the number of Ethernet receive buffers. On some Ethernet 263 controllers it is recommended to set this value to 8 or even higher, 264 since all buffers can be full shortly after enabling the interface on 265 high Ethernet traffic. 266