Linux FlexCAN调试

设备树

按照手册来即可，注意Alpha版上Flexcan2节点的引脚被ecspi3复用，节点中要屏蔽掉flexcan2:

/* Conflict with ECSPI3 */
&can2 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_flexcan2>;
	xceiver-supply = <&reg_can_3v3>;
	status = "disabled";
};

原厂设备树节点中xceiver-supply = <&reg_can_3v3>;这个属性可能会导致deferred probing，让CANprobe不出来，屏蔽掉这个属性就可以，完成后的节点如下：

&can1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_flexcan1>;
	//xceiver-supply = <&reg_can_3v3>;
	status = "okay";
};

完成后ifconfig -a应该可以看得到CAN节点信息：

/ # ifconfig -a
can0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          NOARP  MTU:16  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:206 

eth0      Link encap:Ethernet  HWaddr EA:36:EF:87:91:0F  
          inet addr:192.168.1.103  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::e836:efff:fe87:910f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3294 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1444 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4472406 (4.2 MiB)  TX bytes:259612 (253.5 KiB)

eth1      Link encap:Ethernet  HWaddr C6:F2:80:26:D2:07  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

sit0      Link encap:IPv6-in-IPv4  
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

iproute库编译

经过试验，新版本的iproute确实会出现找不到诸如libelf头文件等奇怪的情况，暂未深究原因。

编译时可能报错：

错误： 对‘setns’的静态声明出现在非静态声明之后
方法是打开iproute根目录/include/namespace.h文件，注释掉下面几行：

#ifndef HAVE_SETNS
static inline int setns(int fd, int nstype)
{
#ifdef __NR_setns
	return syscall(__NR_setns, fd, nstype);
#else
	errno = ENOSYS;
	return -1;
#endif
}
#endif /* HAVE_SETNS */

然后重新编译