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dc625d04d2
Add documentation for new "pcap" command. Signed-off-by: Ramon Fried <rfried.dev@gmail.com> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
63 lines
2.3 KiB
Plaintext
63 lines
2.3 KiB
Plaintext
PCAP:
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U-boot supports live Ethernet packet capture in PCAP(2.4) format.
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This is enabled by CONFIG_CMD_PCAP.
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The capture is stored on physical memory, and should be copied to
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a machine capable of parsing and displaying PCAP files (IE. wireshark)
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If networking works properly one can copy the capture file from physical memory
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using tftpput, or save it to local storage with (sf write, mmc write, fatwrite, etc)
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the pcap capturing requires maximum buffer size.
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when the buffer is full an error message will be displayed and then packets
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will silently drop.
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the actual capture file size is populate in the environment variable "pcapsize".
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Usage example:
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# Initialize pcap capture to physical address (0x100000) with maximum size of
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# 100000 bytes.
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# Start capture
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pcap start
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# Initialize network activity
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env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64
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# Stop capture
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pcap stop
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# pcap init 0x100000 100000
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PCAP capture initialized: addr: 0xffffffff80100000 max length: 100000
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# pcap start
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# env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64
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eth0@10000000: PHY present at 0
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eth0@10000000: link up, 1000Mbps full-duplex (lpa: 0x7c00)
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Using eth0@10000000 device
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TFTP from server 10.0.2.2; our IP address is 10.0.2.15
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Filename 'uImage64'.
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Load address: 0xffffffff88000000
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Loading: #################################################################
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#################################################################
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#################################################################
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#################################################################
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!!! Buffer is full, consider increasing buffer size !!!
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#################################################################
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#################################################################
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#################################################################
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#################################################################
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#################################################################
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#
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18.2 MiB/s
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done
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Bytes transferred = 8359376 (7f8dd0 hex)
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PCAP status:
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Initialized addr: 0xffffffff80100000 max length: 100000
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Status: Active. file size: 99991
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Incoming packets: 66 Outgoing packets: 67
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# pcap stop
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# tftpput 0xffffffff80100000 $pcapsize 10.0.2.2:capture.pcap
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