[Buildroot] Issue with Asus Tinkerboard Buildroot OS build

[Peter Seiderer]

Hello Francesco,

re-added CC: buildroot at busybox.net

On Sat, 30 May 2020 11:05:35 +0000 (UTC), "fld2865 at gmail.com" <fld2865 at gmail.com> wrote:

>  Hi Peter,thanks for your prompt reply, first of all.I did try to follow your suggestions, but without luck, unfortunately.More specifically:1. I upgraded the kernel to v. 5.4.40:
> ~# uname -a
> Linux Tinker 5.4.40 #1 SMP Sat May 30 11:28:51 CEST 2020 armv7l GNU/Linux
> 2. I verified that in this kernel the CONFIG_DRM_PANFROST option was selected;3. I added both the KMSRO and Panfrost drivers and clean rebuilt all;
> 4. The OS builddoes boot, but again NO "/dev/fb0" device, and xinit does not start!!!
> Really out of mind.
> If you would like to check my "dmesg", "Xorg.0.log" and "*_defconfig" files for your reference.

Sorry, no more help from my side possible (because I own no Tinkerboard and no deeper
knowledge on the Tinkerboard graphic stack behind the quick google survey with
the results below)...

Regards,
Peter

> Thanking in advance, my best regards,
> Francesco LANDE
> 
> Il giovedì 28 maggio 2020, 20:52:38 CEST, Peter Seiderer <ps.report at gmx.net> ha scritto:  
>  
>  Hello Francesco,
> 
> On Thu, 28 May 2020 17:02:36 +0000 (UTC), "fld2865 at gmail.com" <fld2865 at gmail.com> wrote:
> 
> > Hello Busybox.net,I'm attempting the development of a custom Linux distribution for the Asus Tinkerboard,using Buildroot 2020.02.2.I successfully obtained a booting OS image, which does communicate via serial and SSH,but doesn't output ANYTHING on the HDMI video output.I added all the packages I know of, including X11 stack and OpenGLES libs, but I'm not sureabout which video driver to use. I tried with xf86-video-fbdev and xf86-video-vesa, but withoutsuccess.
> > The net result is that when I try to load the Xserver through startx, I get the following result:
> > /home# startx
> > xauth:  file //.serverauth.255 does not exist
> > xauth:  file //.Xauthority does not exist
> > 
> > 
> > X.Org X Server 1.20.8
> > X Protocol Version 11, Revision 0
> > Build Operating System: Linux 5.4.0-31-generic x86_64
> > Current Operating System: Linux Tinker 5.0.0 #1 SMP Thu May 28 16:06:04 CEST 2020 armv7l
> > Kernel command line: console=ttyS2,115200n8 root=/dev/mmcblk0p1 rootwait
> > Build Date: 28 May 2020  03:26:17PM
> > 
> > Current version of pixman: 0.38.4
> >         Before reporting problems, check http://wiki.x.org
> >         to make sure that you have the latest version.
> > Markers: (--) probed, (**) from config file, (==) default setting,
> >         (++) from command line, (!!) notice, (II) informational,
> >         (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
> > (==) Log file: "/var/log/Xorg.0.log", Time: Thu Jan  1 01:10:01 1970
> > (==) Using default built-in configuration (21 lines)
> > (EE)
> > Fatal server error:
> > (EE) no screens found(EE)
> > (EE)
> > Please consult the The X.Org Foundation support
> >          at http://wiki.x.org
> >  for help.
> > (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
> > (EE)
> > (EE) Server terminated with error (1). Closing log file.
> > 
> > 
> > /var/log/Xorg.0.log basically says that there's no /dev/fb pseudo file, which is true, so I thinkI'm using the wrong video driver.Any hint about how could I address this issue?  
> 
> Most probably no graphic enabled in the kernel config, tinkerboard uses an Mali-T760 GPU ([1]),
> there is a official mixed open/closed source graphic stack available I think, or the complete
> open source graphic stack 'panfrost' ([2]), see  [3] for a starting point...
> 
> Regards,
> Peter
> 
> [1] https://en.wikipedia.org/wiki/Asus_Tinker_Board
> [2] https://panfrost.freedesktop.org/
> [3] https://panfrost.freedesktop.org/building-panfrost-mesa.html
> 
> > Thanks & best regards,
> > Francesco LANDE  
>