10 May
2015
10 May
'15
4:08 p.m.
On Fri, Apr 24, 2015 at 02:49:37PM +0200, Hannes Petermaier wrote:
Since the used AM3352 SoC doesn't have GPU it isn't allways necessary to build in complete drm-stuff into linux kernel. In very small applications only we use the simple-framebuffer.
So we have 2 use-cases:
- device operating on drm-driver (let simplefb node disabled)
- device operating on simplefb-driver (activate simplefb node and reserve mem)
The decision is made by means of "simplefb" environment variable.
simplefb = 0 we don't enable the (maybe) existing simplefb node and all the rest around display is up to the linux-kernel. We just disable the backlight, beceause we do not want see the flicker during take over of drm-driver.
simplefb = 1 we enable the (maybe) existing simplefb node and reserve framebuffers size in memory.
Signed-off-by: Hannes Petermaier oe5hpm@oevsv.at
Applied to u-boot/master, thanks!
--
Tom