DT: newbie questions

Chris Moore moore at free.fr
Wed May 17 08:41:42 PDT 2017


Le 16/05/2017 à 12:51, Chris Moore a écrit :
> Le 16/05/2017 à 10:08, Neil Armstrong a écrit :
>> On 05/16/2017 06:18 AM, Chris Moore wrote:
>>> Le 15/05/2017 à 11:28, Chris Moore a écrit :
>>>> I would like to add support for the cheap Chinese KI PLUS S905 
>>>> boxes which seem very popular.
>>>> They are re-branded (or cloned) by several different vendors.
>>>> In particular the most serious seem to be:-
>>>> VideoStrong (http://www.videostrong.com/product.asp?sid=257)
>>>> Acemax 
>>>> (http://www.acemax.net.cn/droid-world/droid-box/hybrid-android-dvb-t2-dvb-s2/kii-pro-ki-plus-s2-t2-combo-149.html#.WRls_GjyiUk)
>>>> I actually have an Xtreamer mxV (http://www.xtreamer.net/mxv) which 
>>>> seems to be an exact clone.
>>>> My first question is what to put in the compatible line.
>>>> I could put:
>>>> a) compatible = "videostrong,kiplus", "acemax,kiplus", 
>>>> "xtreamer,mxv", "amlogic,meson-gxbb";
>>>> but there are many other KI PLUS vendors so I could maybe omit the 
>>>> vendor:
>>>> b) compatible = "kiplus", "xtreamer,mxv", "amlogic,meson-gxbb";
>>>> but this poses the problem of what to put in amlogic.txt which 
>>>> seems to require a vendor.
>>> Another solution to the multi-vendor problem could be to create a 
>>> pseudo-vendor "generic" (or similar) and then have:
>>> c) compatible = "generic,kiplus", "xtreamer,mxv", "amlogic,meson-gxbb";
>>> Would this be acceptable?
>> Sorry, the generic is not really acceptable here since there is 
>> always a vendor, and adding a new
>> vendor is easy and well accepted.
>> The point with Amlogic based Set-Top-Boxes is that they are 99% based 
>> on a reference design given
>> from Amlogic, and only the SBCs (Odroid-C*, Khadas, NanoPi K2) differs.
>> Here is the list of Amlogic Reference Designs I am aware of :
>> - S905 : P200 and P201
>> - S905X : P212
>> - S905D : P230 and P231
>> - S912 : Q200 and Q201
>> When pushing S905 based boxes, we were not really aware of that, but 
>> starting with S905X we started
>> to base the board DTS on the Reference Design DTSI like the Khadas 
>> Vim and the Wetek Hub/Play2.
>> I'm aware there is a lot of work to clean up all the other S905/S905X 
>> and S912 based boxes... but
>> the majority of boxes should run unchanged with the reference design 
>> DTS.
> The KI PLUS has GXBB (S905), Fast (100Mbs) Ethernet, 1 GiB RAM, four 
> USB ports and often Realtek RTL8189ETV WiFi.
> The P20x boards are probably the closest but they have Gigabit 
> Ethernet and the KI PLUS only has Fast Ethernet.
> (Indeed the stock uBoot prompt and some Linux boot messages contain 
> the string "p20x".)
> So, although obviously derived from these reference designs as you 
> say, Ethernet doesn't work with the P200 and P201 DTS.
> Obviously working Ethernet is essential.

In fact the P201 probably does have Fast Ethernet.
I remember that my board used to work well with the P201 DTB.
But this was with the Amlogic 3.14.y kernels.
In the mainline 4.x kernels it was incorrectly described with Gigabit 
But I see that this has just been corrected in 4.12-rc1.
However unfortunately I cannot get 4.12-rc1 to boot: I get no kernel 
output at all on the serial console :(
I have never had any problems with the 4.10 and 4.11 series.

Have you tried 4.12-rc1 on a GXBB board?
What bootargs do you recommend?

> The only existing GXBB DTS with 1GiB RAM and Fast Ethernet is the GXBB 
> version of the Nexbox A95x.
> But USB on the KI PLUS doesn't work with this DTS.
> So I really do need a new DTS.

Well, in view of the above I probably can make do with the P201 DTS, at 
least until I try to get the internal DVB tuners working.

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