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:
|
|
|
|
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
|
|
|