Dear List, I have a MCP2515 interfaced to a Gumstix Overo COM module. The MCP2515 seems to be probed OK at statup and the sysfs gets populated with all the CAN stuff. However when I try to bring up the interface I get the following:
r...@ctm100:~# echo 125000000 > /sys/class/net/can0/can_bittiming/bitrate r...@ctm100:~# ifconfig can0 up CTM100, CAN Transiever Enable mcp251x spi1.1: bitrate error 2.7% r...@ctm100:~# NOHZ: local_softirq_pending 08 On trying to send a message I get: r...@ctm100:~# cansend can0 1F334455#1122334455667788 r...@ctm100:~# ------------[ cut here ]------------ WARNING: at net/sched/sch_generic.c:226 dev_watchdog+0x138/0x218() NETDEV WATCHDOG: can0 (mcp251x): transmit timed out Modules linked in: ppp_generic slhc ipv6 ftdi_sio mcp251x usbserial can_dev [<c00f3608>] (unwind_backtrace+0x0/0xdc) from [<c010eb04>] (warn_slowpath_common+0x4c/0x80) [<c010eb04>] (warn_slowpath_common+0x4c/0x80) from [<c010eb74>] (warn_slowpath_fmt+0x28/0x38) [<c010eb74>] (warn_slowpath_fmt+0x28/0x38) from [<c039df88>] (dev_watchdog+0x138/0x218) [<c039df88>] (dev_watchdog+0x138/0x218) from [<c01171b4>] (run_timer_softirq+0x180/0x1fc) [<c01171b4>] (run_timer_softirq+0x180/0x1fc) from [<c0113550>] (__do_softirq+0x9c/0x170) [<c0113550>] (__do_softirq+0x9c/0x170) from [<c0113664>] (irq_exit+0x40/0x90) [<c0113664>] (irq_exit+0x40/0x90) from [<c00ee058>] (_text+0x58/0x70) [<c00ee058>] (_text+0x58/0x70) from [<c00ee9f0>] (__irq_svc+0x30/0x80) Exception stack(0xc057df70 to 0xc057dfb8) df60: 00000000 60000013 03145d45 00000000 df80: c00efd3c c057c000 c057ff8c c00efd3c c05b8be8 411fc082 0000001f 00000000 dfa0: c0581220 c057dfbc c00efd74 c00efd7c 60000013 ffffffff [<c00ee9f0>] (__irq_svc+0x30/0x80) from [<c00efd74>] (default_idle+0x38/0x48) [<c00efd74>] (default_idle+0x38/0x48) from [<c05f29ac>] (0xc05f29ac) ---[ end trace 7f42958e9cf97483 ]--- mcp251x spi1.1: timeout in txing a packet, restarting This is my first time trying to use socket-can (thanks for the good work by the way) with a real interface. I suspect that I may have a problem with the interrupt somewhere but thought you may have seen something similar and be able to suggest some tests or solutions. Many thanks.
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