tech-kern archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: wdisplay pixel format


On Fri, 16 Sep 2011 09:39:12 +0200
Martin Husemann <> wrote:

> On Thu, Sep 15, 2011 at 09:20:56PM -0400, Michael wrote:
> > So, most wsdisplay drivers will hand you an 8bit colour-indexed 
> > framebuffer, if you get higher colour depth it will be RGB unless you're on 
> > a Sun or SGI.
> Aren't the mmap() details inherently MD anyway?

To a degree. On hardware where it's actually possible ( that includes pretty 
much all PCI, SBus and UPA cards but not things like newport and crime ) the 
driver will hand you a linear framebuffer at mmap(ttyE0) offset 0, there are 
ioctl()s to muck with palette registers and for querying basic geometry 

> Though we should have some query ioctls to get at least basic infos...

We do, and that's how the xf86-video-wsfb driver works.

have fun

Home | Main Index | Thread Index | Old Index