Re: m68k: trying accessing fb memory

I grepped all the linux tree for "HAVE_ARCH_FB_UNMAPPED_AREA".

arch/sparc/include/asm/pgtable_64.h:#define HAVE_ARCH_FB_UNMAPPED_AREA
arch/blackfin/include/asm/pgtable.h:#define HAVE_ARCH_FB_UNMAPPED_AREA
drivers/video/fbmem.c:#ifdef HAVE_ARCH_FB_UNMAPPED_AREA

Seems that for my case (m68k-nommu) it is not defined, so none of the
get_unmapped_area will be called, in any place.


Bu in fbmem.c there is a "fb_mmap" that's probably called.

I will try to set correctly as you said  fix.smem_start and .smem_len
and let you know.

Thanks
Angelo


On 12/12/2012 23:21, Gavin Lambert wrote:
> Quoth angelo:
>> thanks, well, i implemented the handler:
>>
>> static int amcorefb_mmap(struct fb_info *info, struct vm_area_struct
>> *vma) {
> 
> No, that's not the right one.  You don't need to implement that.
> 
>> Seems i miss the "get_unmapped_area/BDI_CAP_MAP_DIRECT) capability.
> 
> fbmem.c implements the main get_unmapped_area handler.  In your framebuffer
> driver you just need to either implement fb_get_unmapped_area or (easier,
> but only works on nommu) set fix.smem_start and .smem_len correctly in your
> fb_info.
> 
> 
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