Re: Raspberry Pi POE+ hat overlay

Hi Nuno,

I'm not sure where to start - I just happened to notice in the
documentation here:
https://www.raspberrypi.com/documentation/computers/config_txt.html that
the cpu frequency Pi4B R1.4 was listed as 1800 if arm_boot=1 so I tried it.

Doug.



On Wed, 17 May 2023 at 11:11, Nuno Teixeira <eduardo@freebsd.org> wrote:

> Hello Doug,
>
> I have too a 1.5 rpi but arm_boost=1 isn't doing anything, htop shows
> 1500Mhz when doing something intensive.
> I'm running 13.2 stable
>
> Do I missing something?
>
> Could you take a look at my setup?
>
> Thanks,
>
> Doug Rabson <dfr@rabson.org> escreveu no dia terça, 16/05/2023 à(s) 17:19:
>
>>
>> On Sat, 13 May 2023 at 13:45, Doug Rabson <dfr@rabson.org> wrote:
>>
>>> I was able to build an updated rpi-firmware port based on 1.20210805 and
>>> this boots successfully on pi400 as well as rpi4. With this, I can load the
>>> rpi-poe-plus overlay and I just need to try and reverse engineer the
>>> undocumented mailbox API by reading the Linux code.
>>>
>>
>> I have a first approximation of a fan driver which works with the
>> 1.20210805 firmware (actually, I substituted rpi-poe-plus.dtbo from
>> 1.20210831 which just changes the fan levels for the POE+). I'm testing
>> with an rpi4B rev 1.5 with 'make -j4 buildworld' and the fan is keeping the
>> cpu temperature below 65 degrees which is nice, especially since I set
>> arm_boost=1 in config.txt which boosts the cpu frequency up to 1800 for
>> this board.
>>
>> Does anyone have a pointer to the problem with firmware later than
>> 20210805? Would it make any kind of sense to try to get the fix into
>> releng/13.2 as an errata?
>>
>>
>
> --
> Nuno Teixeira
> FreeBSD Committer (ports)
>