Re: Raspberry Pi POE+ hat overlay

Confirmed that arm_boost is enable by default on rpi4 rev >= 1.4 as I
checked with htop.

Also, tested arm_freq=1800 and it crashes FreeBSD around initializing
console/video and detecting mouse.

As linux config.txt says:
---
[pi4]
# Run as fast as firmware / board allows
arm_boost=1
---
firmware must be updated to support this feature for sure.

Cheers,

Nuno Teixeira <eduardo@freebsd.org> escreveu no dia quarta, 17/05/2023 à(s)
14:08:

> (...)
>
> I was meant using 13.2 not 12.3 :)
>
> Doug Rabson <dfr@rabson.org> escreveu no dia quarta, 17/05/2023 à(s)
> 13:47:
>
>> I'm not sure about 12.3 either - you could try with 13.2 and see if that
>> makes a difference.
>>
>> On Wed, 17 May 2023 at 13:45, Nuno Teixeira <eduardo@freebsd.org> wrote:
>>
>>> Hey,
>>>
>>> Ok. I'm new to rpi4 and arm in general but tomorrow I will force
>>> 'arm_freq=1800' again just to see it it crashes again.
>>> I will check too what values linux shows.
>>>
>>> I don't know if firmware/uboot version included in 12.3 supports this
>>> feature.
>>>
>>> Cheers,
>>>
>>> Doug Rabson <dfr@rabson.org> escreveu no dia quarta, 17/05/2023 à(s)
>>> 13:11:
>>>
>>>> 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)
>>>>>
>>>>
>>>
>>> --
>>> Nuno Teixeira
>>> FreeBSD Committer (ports)
>>>
>>
>
> --
> Nuno Teixeira
> FreeBSD Committer (ports)
>


-- 
Nuno Teixeira
FreeBSD Committer (ports)