Re: Community-maintained 3.14.16 kernel for i.MX6 devices

[Carlos Rafael Giani <dv@pseudoterminal.org>]

On 08/19/2014 11:47 PM, John Weber wrote:
>
> On 8/19/14, 1:19 PM, Carlos Rafael Giani wrote:
>> Hello,
>>
>> I want to take a few minutes and mention in this mailing list the 
>> amazing work of Jon Nettleton, Russell King, and others. This is 3.14 
>> kernel, with FSL patches, upstream patches, memleak fixes, and 
>> numerous improvements for stability that are not present in the 
>> linux-imx kernels. The target hardware for this has been the SolidRun 
>> product line so far (since the developers' time is limited, and they 
>> don't have every imx6 device under the sun to test with), but putting 
>> other devicetree files in it should not be difficult. Initial tests 
>> on SolidRun hardware show noticeable improvements.
> This looks pretty awesome.  Thanks for sharing.  What versions of 
> SolidRun HW is it supporting?

All of them. All CuBox-i and HummingBoard variants.

>>
>> To list a few enhancements:
>> * FEC ethernet performance, rated by Freescale at 470 Mbps; with 
>> Russell King's improvements pushed to 630+ down and 500+ up
>> * lower I/O latencies
>> * SDHC patchset for better UHS-I support
>> * residue support for SDMA with FSL's custom firmware integrated to 
>> work with HDMI and optical SPDIF
>> * higher DMA and GPU efficiency in general
>> * and of course the upstream 3.14 improvements over 3.10
>>
>> VPU and GPU have also successfully been tested with this kernel.
> Cool! What GPU and VPU tests have you been running?

Jon Nettleton, I, and others have been running XBMC with VPU 
acceleration, Chromium with EGL-based drawing enabled + with my VPU 
patches (which I will release here in a few days) running HTML5 Canvas 
and WebGL tests, and gstreamer-imx with the EGL-based video sink that 
uses the Vivante direct textures. Using the jellyfish test files: 
http://jell.yfish.us/ , XBMC has shown to play h264 bitrates up to 100 
Mbps (higher ones exhibit framedrops).