Re: Re: [Linux-fbdev-users] Monocrom Display

[Antonino D. <ad...@po...>]

On Sun, 2003-02-23 at 19:31, Antonino Daplas wrote:
>
> Yes, I saw that.  What I meant was XFBDev (and most fb-based
> applications) requires that video memory is mappable to userspace,
> otherwise the driver will only work within the console.  If you need to
> have these apps work, then you have to find a way to map the video
> memory.  Also fix->smem_start requires a physical address, so you need
> the virt_to_phys() macro.
> 
> You can try this in xxxfb_encode_fix():
> 
> fix->smem_start = virt_to_phys(info.vmemory)
> 
> If you're very lucky, vmalloc() might have given you a chunk of memory
> that is linear.  Do not rely on vmalloc() though, try __get_free_pages()
> instead.
> 
 
BTW: If you do intend to use __get_free_pages(), it will also return a
virtual pointer. So you still have to use virt_to_bus() or
virt_to_phys(). __get_free_pages() will probably give you around
128-512K of linear memory, possibly more, it depends on the machine
architecture.

Tony