I have Beaglebone Black working with Ubuntu 14.04. I minimized it using the guide for blinking a pre-created image in eMMC .
From the manuals that I saw, I had to read /sys/class/hwmon/hwmon0/device/temp1_inputto get the temperature of the processor. But I have no such path in my system; I assume that the kernel module for the Beaglebone Black AM3358 ARM CPU provides this functionality and that there is no such module in my image, but I donโt know where to start getting such a module. In fact, it /sys/class/hwmonis an empty directory.
These are the modules that I have:
$ lsmod | sort
6lowpan_iphc 10154 1 bluetooth
bluetooth 316797 10 bnep,rfcomm
bnep 11946 2
can_dev 7430 1 c_can
c_can 9400 1 c_can_platform
c_can_platform 5927 0
g_multi 3238 0
iptable_filter 1149 1
ip_tables 11857 1 iptable_filter
libcomposite 38715 5 usb_f_acm,usb_f_ecm,usb_f_rndis,g_multi,usb_f_mass_storage
musb_am335x 1075 0
musb_dsps 8369 0
musb_hdrc 76236 1 musb_dsps
rfcomm 46571 0
rfkill 14659 2 bluetooth
u_ether 9524 3 usb_f_ecm,usb_f_rndis,g_multi
usb_f_acm 5687 1
usb_f_ecm 7901 1
usb_f_mass_storage 34664 2 g_multi
usb_f_rndis 17711 2 g_multi
u_serial 9631 1 usb_f_acm
x_tables 12575 3 ip_tables,xt_multiport,iptable_filter
xt_multiport 2051 1
... and general status:
$ uname -a
Linux hostname 3.14.26-ti-r43 #1 SMP PREEMPT Wed Dec 24 05:27:12 UTC 2014 armv7l armv7l armv7l GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
So, how can I read the processor temperature on Beaglebone Black that is missing this file?