1PCAP: 2 3U-boot supports live Ethernet packet capture in PCAP(2.4) format. 4This is enabled by CONFIG_CMD_PCAP. 5 6The capture is stored on physical memory, and should be copied to 7a machine capable of parsing and displaying PCAP files (IE. wireshark) 8If networking works properly one can copy the capture file from physical memory 9using tftpput, or save it to local storage with (sf write, mmc write, fatwrite, etc) 10 11the pcap capturing requires maximum buffer size. 12when the buffer is full an error message will be displayed and then packets 13will silently drop. 14the actual capture file size is populate in the environment variable "pcapsize". 15 16Usage example: 17 18# Initialize pcap capture to physical address (0x100000) with maximum size of 19# 100000 bytes. 20 21# Start capture 22pcap start 23 24# Initialize network activity 25env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64 26 27# Stop capture 28pcap stop 29 30# pcap init 0x100000 100000 31PCAP capture initialized: addr: 0xffffffff80100000 max length: 100000 32 33# pcap start 34# env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64 35eth0@10000000: PHY present at 0 36eth0@10000000: link up, 1000Mbps full-duplex (lpa: 0x7c00) 37Using eth0@10000000 device 38TFTP from server 10.0.2.2; our IP address is 10.0.2.15 39Filename 'uImage64'. 40Load address: 0xffffffff88000000 41Loading: ################################################################# 42 ################################################################# 43 ################################################################# 44 ################################################################# 45!!! Buffer is full, consider increasing buffer size !!! 46 ################################################################# 47 ################################################################# 48 ################################################################# 49 ################################################################# 50 ################################################################# 51 # 52 18.2 MiB/s 53done 54Bytes transferred = 8359376 (7f8dd0 hex) 55PCAP status: 56 Initialized addr: 0xffffffff80100000 max length: 100000 57 Status: Active. file size: 99991 58 Incoming packets: 66 Outgoing packets: 67 59 60# pcap stop 61# tftpput 0xffffffff80100000 $pcapsize 10.0.2.2:capture.pcap 62 63