4.9 | /proc/cpuinfo always shows Hardware = BCM2835

[Fourdee]

As title, in 4.9.27, /proc/cpuinfo always shows BCM2835 for Hardware info. Confirmed with:

• RPi 3
• RPi Zero
• RPi Zero W

In 4.4.50

• RPi 2/3 = BCM2709 (incorrect?https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2836/README.md https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2837/README.md)
• RPi 1/zero = BCM2708 (incorrect? https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2835/README.md)

This is an issue for us, as we use the that information to determine which RPi is actually running, and, how we optimize for those devices (minus cpu core detection $(nproc --all) for software installs such as php-fpm thread count).
https://github.com/Fourdee/DietPi/issues/936#issuecomment-301055299

Any chance we could see a possible fix for correct Hardware information, reported in /proc/cpuinfo?

Revision codes do seem to be correct in 4.9.27: https://github.com/Fourdee/DietPi/blob/master/dietpi/misc/rpi_boardinfo

[clivem]

#1725

[pelwell]

This is an unintended but unavoidable consequence of using less downstream, Pi-specific code in newer kernels. I suggest you use /proc/device-tree/model (human readable) or extract the information you need from the Revision field of /proc/cpuinfo. There is a bit in the revision number indicating that it's in the new format: if it's set then the CPU type is in another group of bits, otherwise it must be a 2708.

[Fourdee]

@pelwell

Thanks for the info 👍

I've made the switch to using revision codes for board detection:
https://github.com/Fourdee/DietPi/blob/testing/dietpi/dietpi-obtain_hw_model#L125-L364

I'll mark as closed, [dupe] of raspberrypi/firmware#705

[karu2003]

popcornmix
Thank you!!!!