Now, I see that the requested videobuffers are correctly allocated via
'vb2_dma_contig_alloc'
call (see [3] for reference). But the MMAP call fails in
'vb2_dma_contig_alloc' function
in mm/nommu.c (see [4] for reference) when it tries to make the following
check:
if (addr !=
...@blackfin.uclinux.org
Subject: Re: Using MMAP calls on a video capture device having
underlying NOMMU arch
Now, I see that the requested videobuffers are correctly allocated
via 'vb2_dma_contig_alloc'
call (see [3] for reference). But the MMAP call fails in
'vb2_dma_contig_alloc' function
Hi,
I have been trying recently to make a usb-based-webcam device to work with
Linux. The entire scheme is a bit complex:
UVC gadget --User Pointer-- User-Space Daemon -- MMAP -- V4L2 capture
device.
The UVC gadget is internally a v4l2 based device supporting VB2_VMALLOC
operations,
whereas
