Re: Hardware 3D acceleration doesn't work anymore after the PowerPC updates 4.14-1

Hi Christian,

Christian Zigotzky [off-list ref] writes:

Hi All,

I tested the latest Git kernel version with the new PowerPC updates 
4.14-1 [0][1] on my Varisys Cyrus Plus board (A-EON AmigaOne X5000) 
[2][3] with a Qoriq P5020 PowerPC CPU from NXP yesterday. Unfortunately 
the hardware 3D acceleration doesn't work anymore since the PowerPC 
updates 4.14-1 [0]. I tested it with ubuntu MATE 16.04.3 LTS PowerPC 
(64-bit kernel and 32-bit userland) and with the MATE PowerPC Remix 2017 
(64-bit kernel and 32-bit userland) [4]. I reduced the RAM to 3.5GB via 
kernel boot arguments but without any success. (mem=3500M)

...

I tried to figure out what the problem is yesterday. Here are the results.

export LIBGL_DEBUG=verbose

gdb glxgears

run

Output:

Starting program: /usr/bin/glxgears
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/powerpc-linux-gnu/libthread_db.so.1".
libGL: OpenDriver: trying /usr/lib/powerpc-linux-gnu/dri/tls/r600_dri.so
libGL: OpenDriver: trying /usr/lib/powerpc-linux-gnu/dri/r600_dri.so
[New Thread 0xf7fbd450 (LWP 7135)]
libGL: Can't open configuration file /home/amigaone/.drirc: No such file 
or directory.
libGL: Can't open configuration file /home/amigaone/.drirc: No such file 
or directory.
libGL: Using DRI2 for screen 0

Thread 1 "glxgears" received signal SIGBUS, Bus error.
memset () at ../sysdeps/powerpc/powerpc32/memset.S:293

Can you try Linus' mainline, with just the following commit reverted:

31bfdb036f12 ("powerpc: Use instruction emulation infrastructure to handle alignment faults")

So just:

$ git revert 31bfdb036f12 

cheers