[U-Boot] netconsole: USB Ethernet connection dropping with ping or tftpboot
Jörg Krause
jkrause at posteo.de
Thu Feb 5 12:21:05 CET 2015
On Di, 2015-02-03 at 22:44 +0100, Jörg Krause wrote:
> I followed the instructions from Marek in 'M28 U-Boot Single-Wire Debug
> preview' to enable NetConsole:
> http://www.denx-cs.de/?q=blogm28singlewiredebug
>
> I'm using mxsldr to flash the u-boot.sb image to RAM. This is the dmesg
> output from my host:
>
> [31048.492181] usb 3-13: new high-speed USB device number 24
> using xhci_hcd
> [31048.667617] cdc_ether 3-13:1.0 eth0: register 'cdc_ether' at
> usb-0000:00:14.0-13, CDC Ethernet Device, 00:19:b8:00:00:01
> [31048.669101] cdc_ether 3-13:1.0 enp0s20u13: renamed from eth0
> [31048.696758] cdc_ether 3-13:1.0 enp0s20u13: kevent 12 may have
> been dropped
>
> I noticed the 'kevent 12 may have been dropped' message here.
>
> Nevertheless, NetworkManager shows me a USB Ethernet connection and
> using './netconsole 10.0.0.2' I am able to communicate with the device,
> e.g. 'nand info' outputs correctly.
>
> But if I use 'ping 10.0.0.1' or 'tftpboot u-boot.sb' the network
> connection drops. Both commands work fine if I switch back from
> netconsole to serial in-/output.
>
> This is the output from dmesg:
> [31620.215354] usb 3-13: USB disconnect, device number 24
> [31620.215422] cdc_ether 3-13:1.0 enp0s20u13: unregister
> 'cdc_ether' usb-0000:00:14.0-13, CDC Ethernet Device
>
> Do I missed something?
I managed to get serial console and netconsole muxing to work, so I can
see all the debug messages:
Hit any key to stop autoboot: 5 using ci_udc, OUT ep- IN ep-
STATUS ep-
MAC 00:19:b8:00:00:02
HOST MAC 00:19:b8:00:00:01
high speed config #1: 2 mA, Ethernet Gadget, using CDC Ethernet
USB network up!
0
=> tftp u-boot.sb
using ci_udc, OUT ep- IN ep- STATUS ep-
timeout sending packets to usb ethernet
This reminded me about an issue I had some months ago:
http://lists.denx.de/pipermail/u-boot/2014-July/182885.html
I enabled debug output in arch/arm/cpu/arm926ejs/cache.c and I get
error:
=> tftp u-boot.sb
using ci_udc, OUT ep- IN ep- STATUS ep-
CACHE: Misaligned operation at range [43f7b010, 43f7b070]
I removed the flush_cache() call in cmd_net.c:netboot_common() as
suggested by Marek in the thread. But the error message is still there.
Any idea?
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