[Letux-kernel] Comparison PinePhone to Librem 5

[H. Nikolaus Schaller]

> Am 21.12.2019 um 15:58 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> On Sat, 21 Dec 2019 12:04:15 +0100
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> 
>> IMHO quite well written:
>> 
>> 	https://amosbbatto.wordpress.com/2019/12/01/decide-pinephone-vs-librem-5/
>> 
>> I could now boot my developer PinePhone to Ubuntu Touch and it works.
>> Well, it is a little difficult to find out how to operate Ubuntu
>> Touch without a user manual... So I could not really use it. But
>> this is not the hardware to blame for.
>> 
>> The Galaxy J7 battery doesn't fit 100% so I would have to cut
>> off some tiny pieces of plastic to make it fit. Fortunately, it
>> started to charge the unlabeld battery that came with the PinePhone.
>> 
>> So if I find time, I want to try to get access to the serial console
>> and find out if I can configure the USB port to become an ethernet
>> gadget. Both will make software development easier.
>> 
>> The plan is to port LetuxOS and first steps have been made:
>> 
>> http://download.goldelico.com/letux-u-boot/PinePhone/20191220/
>> http://git.goldelico.com/?p=letux-makesd.git;a=commit;h=5a2d803d892c1d0124f6123c47b99b7b042021d5
>> 
>> What is missing is a LetuxOS kernel which needs a 64 bit ARM
>> (cross)toolchain I currently do not have in my setup. Otherwise
>> it should not be difficult to modify the letux_defconfig.
>> 
> Couldn't you just compile the kernel on the PinePhone?

Well, that would require a big enough µSD.

> Would be interesting how long that takes and what you can fry on it
> while doing so.

I have experimented with kernel compilation on the RasPi 3B+ which is
a comparable SoC and it did take 2 hours with a 200 GB µSD. My cross
compiler needs 30 minutes.

> And what is power consumption for just displaying something with  slow
> changes. On gta04 my voltage display script shows around 200mA in an
> rxvt. What are the values for other devices?

Well, there are rumours that the Librem 5 has a standby time of 1 hour.
With a 3000 mAh battery this would mean unbelievable 3A... So I more
think the rumours are wrong.

Even the pyra only draws ca. 800 mA with display and keyboard backlight
fully on and in idle. Really running code may drive it up to 1.5 - 2A.

BR,
Nikolaus