i.MX Processors中的主题 Re: how to make multiple-buffer effect immediately

how to make multiple-buffer effect immediately

jiejia — Tue, 21 Jul 2015 09:07:29 GMT

bsp:linux3.0.35 cpu:imx6q. My lcd resolution is 800*600

To use multiple-buffer rendering, I set 'export FB_MULTI_BUFFER=2'.

And then I print the resolution of fb0:

xres = 800

yres = 600

var.xres_virtual = 800

var.yres_virtual = 600

I download the gpu_sdk_v1.00.gz, and execute the GLES example in the file.

And then I print the resolution of fb0:

xres = 800

yres = 600

var.xres_virtual = 800

var.yres_virtual = 1200

Why multiple-buffer no effect immediately after I set 'export FB_MULTI_BUFFER=2'?

Re: how to make multiple-buffer effect immediately

Bio_TICFSL — Wed, 22 Jul 2015 13:21:20 GMT

Hi jie,

BSP 3.0.35 includes vivante driver 4.6.9 p12v and this version has some bugs regarding FB_MULTIBUFFER, I strongly recommend to update vivante 5.0.11p6 included in BSP 3.14.28

Regards

Re: how to make multiple-buffer effect immediately

jiejia — Thu, 23 Jul 2015 09:14:25 GMT

Hi Bio_TICFSL

Should I update the vivante_drv.c and vivante_drv.h? Or,I have to update the kernel to 3.14.28?

Regards

Re: how to make multiple-buffer effect immediately

Bio_TICFSL — Thu, 23 Jul 2015 17:03:25 GMT

Hi jie,

You should upgrade the bsp to 3.14.28 this bsp includes the vivante drv, while 3.0.35 you have to pass it by module.

Regards