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Tested changing the fan speed by running: sysctl dev.asmc.0.fan.0.minspeed=3000.

Then ran sysctl -a | grep -I asmc which resulted in sensor data dumped (yippie!).

Loaded the module to test with kldload.

Copied the module to my pFsense Mac Mini.

Note there are two of them, one already in boot and the other is the one you want with the current date and time, you can check with ls -l

Found where the complier placed the module by running find / -name asmc.ko.

Compiled the new asmc module by going to the source directory /usr/src/sys/modules/asmc and running make.

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Used his code but added Macini5,1 and 5,2 as well, everything else the same.

Edit the source file /usr/src/sys/dev/asmc/asmc.c as m_g_s_g mentioned.

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Download and install the latest stable DVD ISO freebsd 12,2 and installing onto a VM.I've gotten everything to work on my older 2011 Mac Mini by doing the following: I've joined to forum just to respond to this thread. Only try to modify the existing ones as reported with: $ kldload asmc.ko NOTE that even if pfSense 2.5.2 is supposed to use a STABLE FreeBSD version, I was able to compile it with this source tree: $ fetch ДISCLAIMER: Some temperature/fan sensors are reported to fail with messages shown in dmesg (expected, probably they don't exist in a Mac Mini 6,2).

'Macmini6,1', 'Apple SMC Mac Mini 6,1 (Late 2012)',ДЄSMC_MM52_TEMPS, ASMC_MM52_TEMPNAMES, ASMC_MM52_TEMPDESCS

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So I added this to /usr/src/sys/dev/asmc/asmc.c: /* Line ~304 : Patch for Macmini 6,1 */ This specific Mac Mini version is theoretically not supported, but just copying and adding to asmc.c the config for the last supported model (5,2) did the trick.

This is just to document that I was able to compile and load an asmc.ko module for a Mac Mini 6,1. But I searched for 'Mac Mini smc fan control' and this thread came up as one of the first ones. But this was kind of defeating the purpose of using pfsense for me, since I was trying to move away from arch Linux for the sake of stability. ДЄlthough it does seem according to this that the asmc module does support my mac mini here, but it is in a later version of the kernel, so I could back port the asmc.h and asmc.c changes, build the kernel and it should work.

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Unfortunately I found that my version of the Mac Mini is not supported by the kernel module, and I'd have to update the C header and class files (asmc.c and asmc.h) and build my own version of the 11.3 kernel just to get the kernal module to function. Extracted the asmc.ko file from the iso, and ran kldload. I went downloaded free BSD 11.3, that's the version of free BSD iso you need to download as the current stable version of pfsense uses that kernel, hence your error above). Ok, I thought I'd let you guys know where I got to, Ipmitool-1.8.18_2 CLI to manage IPMI kldstat | grep it looks like I am missing the ipmi.ko module. I have the sysctl -a | grep -i pkg info | grep ipmi So, since I have the 2011 Mac Mini server, I was thinking I should have a motherboard or logic board management controller and checked whether I have the ipmi-tool. Ipmitool-1.8.17_1 CLI to manage IPMI systems ipmitool sensor | grep -i fan | cut -f1-4 -d'|' while researching, I found this:Д¤ 1 0xffffffff81cc1000 113b0 ipmi.ko pkg info | grep ipmi can you share more like a link to how Okay, understand what you're saying. Yeah, import the kernel module from an equivalent FreeBSD iso. Sysctl: unknown oid said in Apple smc fan control: I also ran the command and I got the sysctl dev.asmc -a | grep -i asmc Will I have to compile my own kernal/kernal module to use this functionality? However, this does not appear in the release build.

This does appear to be available in the pfsense freeBSD src ->. This setup is working really well apart from one issue, the os doesn't appear to have the kernal module for apple's smc fan control. I have setup an older macmini (5,1) as a gateway using pfsense, one ethernet port using the onboard broadcom the other a thunderbolt to ethernet adapter.