[LEDE-DEV] LEDE new image on gw5520

[Outback Dingo]

On Tue, Nov 21, 2017 at 5:50 PM, Tim Harvey <tharvey at gateworks.com> wrote:
> On Fri, Nov 10, 2017 at 3:57 AM, Outback Dingo <outbackdingo at gmail.com> wrote:
>> Yeah i can do tthat, as a side note, do you know anything about
>> cpu_scaling or thermal management on this board maybe ? it runs
>> terribly hot
>>
>
> As you guys worked out the GW5520 does not use the i.MX6 FEC GbE and
> instead has 2x Intel i210 mac/phy devices requiring the igb driver.
> This was done for performance reasons as the i.MX6 FEC is bandwidth
> limited due to it's internal bus routing to the SoC.
>
> Regarding the board running hot I can say the following:
> - there's about 1.2W of power on the PCIe bridge. The i.MX6 only has a
> single PCIe host controller so we need a bridge for the 2x GbE's and
> the 2x miniPCI sockets. We have not found any way to lower the power
> draw of the PLX switch
> - to reduce power draw on the i.MX6 (where the rest of the heat is
> coming from) you can use CPU frequency scaling as suggested
> - adjust your thermal solution to your enclosure / mouting. We have
> many customer that use thermal gap filling pads on both the i.MX6 as
> well as the PLX PCIe switch to get heat off the board
>
> Please feel free to send questions to support at gateworks.com - I
> happened across this post rather randomly.


so we ran make kernel_menuconfig and set the performance to ondemand
from the performance setting in the kernel and recompiled / reflashed
however thinking the board would run cooler
it appears with a temperature gun that the device is actually running
hotter..... any thoughts on this

and is it possible to  think the changes I made to the cpu throttling
somehow prevent the cpu getting into idle/sleep mode?
and is the  scaling_min_freq iadjustable?


Thanks
>
> Regards,
>
> Tim
>
> Tim Harvey - Principal Software Engineer
> Gateworks Corporation - http://www.gateworks.com/
> 3026 S. Higuera St. San Luis Obispo CA 93401
> 805-781-2000