问如何调试意外的OpenBMC hwmon AST2600行为？

EN

我正在调试一个pwmtachtool<->hwmon交互问题，当OpenBMC镜像在连接到SensorsBoard和风扇(主机未连接)的AST2600 EVB上运行时观察到该问题。正在运行的OpenBMC镜像是使用bitbake构建的，其中包含为该SensorBoard定制的recipes-phosphor/configuration/entity-manager/SensorBoard.json，。已验证SensorsBoard上的I2C传感器是否可以通过i2ctools访问，以及是否按预期运行。但是，运行"pwmtachtool --get- Fan -speed “始终报告"Fan speed is 0"，即使phy Fan已正确连接。例如：

/usr/local/bin/pwmtachtool 0 --get-fan-speed 0 --verbose

GET_TACH_SPEED:rpm值%0

风扇0速度为0

cat /sys/class/hwmon/hwmon0/fan0 0_input

仔细观察pwmtachtool代码路径，我发现它调用了pwmtach_action()，它读作"/sys/class/hwmon/hwmon/fan"，它总是0。尝试了所有/组合，由sysfs公开:相同的结果。到目前为止，我还不知道为什么会这样。我真的很感谢所有关于如何调试这个问题的建议。

其他详细信息：

ll /sys/class/hwmon/

lrwxrwxrwx 1根0 Feb 16 08:52 hwmon0 -> ../../devices/platform/ahb/ahb:apb/1e610000.pwm-tacho-controller/hwmon/hwmon0

lrwxrwxrwx 1根目录0 Feb 16 08:52 hwmon1平台../../ -> /platform/iio-hwmon/hwmon/hwmon1

lrwxrwxrwx 1根0 Feb 26 22:20 hwmon2 -> ../../devices/platform/ahb/ahb:apb/ahb:apb:bus@1e78a000/1e78a480.i2c-bus/i2c-8/8-004d/hwmon/hwmon2

ll /sys/class/hwmon/hwmon0/*

Lrwxrwxrwx1根目录0 Feb 26 22:20 /sys/class/hwmon/hwmon0/device -> ../../../1e610000.pwm-tacho-->

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan0 0_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan10 10_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan11 11_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan12 12_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan13 13_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan14 14_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan15 15_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan1 1_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan2 2_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan3 3_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan4 4_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan5 5_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan6 6_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan7 7_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan8 8_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/fan9 9_input

-r--1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/name

lrwxrwxrwx 1根目录0 Feb 26 22:20 /sys/ ../../../../../../../firmware/devicetree/base/ahb/apb/pwm-tacho-controller@1e610000 /hwmon/hwmon0/of_node -> node

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm0

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm1

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm10

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm11

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm12

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm13

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm14

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm15

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm2

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm3

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm4

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm5

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm6

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm7

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm8

-rw-r--r-- 1 root root 4096 Feb 26 22:20 /sys/class/hwmon/hwmon0/pwm9

Lrwxrwxrwx1root root 0Feb 16 08:52 /sys/class/hwmon/hwmon0/subsystem -> ../class/hwmon

-rw-r--r-- 1 root root 4096 Feb 16 08:52 /sys/class/hwmon/hwmon0/uevent