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- PCAP:
- U-boot supports live Ethernet packet capture in PCAP(2.4) format.
- This is enabled by CONFIG_CMD_PCAP.
- The capture is stored on physical memory, and should be copied to
- a machine capable of parsing and displaying PCAP files (IE. wireshark)
- If networking works properly one can copy the capture file from physical memory
- using tftpput, or save it to local storage with (sf write, mmc write, fatwrite, etc)
- the pcap capturing requires maximum buffer size.
- when the buffer is full an error message will be displayed and then packets
- will silently drop.
- the actual capture file size is populate in the environment variable "pcapsize".
- Usage example:
- # Initialize pcap capture to physical address (0x100000) with maximum size of
- # 100000 bytes.
- # Start capture
- pcap start
- # Initialize network activity
- env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64
- # Stop capture
- pcap stop
- # pcap init 0x100000 100000
- PCAP capture initialized: addr: 0xffffffff80100000 max length: 100000
- # pcap start
- # env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64
- eth0@10000000: PHY present at 0
- eth0@10000000: link up, 1000Mbps full-duplex (lpa: 0x7c00)
- Using eth0@10000000 device
- TFTP from server 10.0.2.2; our IP address is 10.0.2.15
- Filename 'uImage64'.
- Load address: 0xffffffff88000000
- Loading: #################################################################
- #################################################################
- #################################################################
- #################################################################
- !!! Buffer is full, consider increasing buffer size !!!
- #################################################################
- #################################################################
- #################################################################
- #################################################################
- #################################################################
- #
- 18.2 MiB/s
- done
- Bytes transferred = 8359376 (7f8dd0 hex)
- PCAP status:
- Initialized addr: 0xffffffff80100000 max length: 100000
- Status: Active. file size: 99991
- Incoming packets: 66 Outgoing packets: 67
- # pcap stop
- # tftpput 0xffffffff80100000 $pcapsize 10.0.2.2:capture.pcap
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