From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Date: Thu, 05 Feb 2015 08:33:02 -0700 Subject: [U-Boot] netconsole: USB Ethernet connection dropping with ping or tftpboot In-Reply-To: <1423135265.26058.11.camel@posteo.de> References: <1422999858.2688.14.camel@posteo.de> <1423135265.26058.11.camel@posteo.de> Message-ID: <54D38D2E.50102@wwwdotorg.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 02/05/2015 04:21 AM, J?rg Krause wrote: > On Di, 2015-02-03 at 22:44 +0100, J?rg 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. Perhaps make flush_cache() a macro that also passes in the file/line number where it's called from, and print those out along with he "misaligned operation" error message? (or find some other way to perform a stack dump from within that function).