Linux FlexCAN调试 - Aki's Blog

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Linux FlexCAN调试

2025-04-17

嵌入式 Linux 开发

Linux

/

CAN

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:

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

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：

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

完成后ifconfig -a应该可以看得到CAN节点信息：

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/ # ifconfig -a
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can0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
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          NOARP  MTU:16  Metric:1
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          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
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          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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          collisions:0 txqueuelen:10
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          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
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          Interrupt:206
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eth0      Link encap:Ethernet  HWaddr EA:36:EF:87:91:0F
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          inet addr:192.168.1.103  Bcast:192.168.1.255  Mask:255.255.255.0
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          inet6 addr: fe80::e836:efff:fe87:910f/64 Scope:Link
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          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
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          RX packets:3294 errors:0 dropped:0 overruns:0 frame:0
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          TX packets:1444 errors:0 dropped:0 overruns:0 carrier:0
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          collisions:0 txqueuelen:1000
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          RX bytes:4472406 (4.2 MiB)  TX bytes:259612 (253.5 KiB)
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eth1      Link encap:Ethernet  HWaddr C6:F2:80:26:D2:07
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          BROADCAST MULTICAST  MTU:1500  Metric:1
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          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
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          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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          collisions:0 txqueuelen:1000
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          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
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lo        Link encap:Local Loopback
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          inet addr:127.0.0.1  Mask:255.0.0.0
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          inet6 addr: ::1/128 Scope:Host
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          UP LOOPBACK RUNNING  MTU:65536  Metric:1
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          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
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          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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          collisions:0 txqueuelen:1000
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          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
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sit0      Link encap:IPv6-in-IPv4
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          NOARP  MTU:1480  Metric:1
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          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
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          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
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          collisions:0 txqueuelen:1000
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          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：

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