>From what I remember, the V4l2 driver needs 2 buffers (10MB), the JPEG encoder needs 19MB (at the very least, sometimes it asks for another big buffer but since the first call failed you never get the second request) and the IPIPE needs at least one source buffer (which can be the V4l2 buffer) and one destination buffer (10MB). So you are looking at needing 50MB of buffers to encode the 5MP image!
In addition there is a PAGE_SIZE define in the kernel which causes memory allocation failure for buffers this big. If you recode the V4l2 driver so that it only allocates one buffer, and somehow find a way to get sequential JPEG encoding to work (so that the encoder operates on slices of the image at a time and not the entire 5mp) then you might have a shot at getting it to work. Alternatively you can add a bigger DDR to the EVM. We are considering this route for our platform since it's simpler. Also reducing the available memory with the mem=80M boot arg won't help with your kernel allocation problem. My understanding is that the memory you don't allocate to the system (in this case 48MB) would only be available to the CMEM allocator. And since you can't pass in user pointers (CMEM memory) to the V4l2 driver, you have essentially made the problem worse. This is my understanding... if anyone has any other thoughts I'd certainly like to hear them! Steve pavelhan wrote: > My EVM board has 128M bytes DDR2 ram,and Now i am involved in a 5MP > jpegencode design on DM355,the sensor is MICRON MT9P031. > I want to know the ccdc, ipie and jpegenc part on DM355 need how much > memory to get the work more smoothly? > My program hang at the ipipe initialization function,beacause It can't > get 2 10M bytes from linux kernel, > but I have used the bootargs allocate 80M/100M to the linux,is it not > enough?so Whymy programhang at the ipipe req_bufs? > what should I do next? > Thanks very much! any help will be appreciated! > Pavel > 2008-09-05 > ------------------------------------------------------------------------ > Pavel Han > Oplinx Co.,Ltd > Address:Hanggang Fuchun BusinessMansion 2116# Futian, Shenzhen 518041,PRC > Tel: (086)0755-88359865 > Website:www.oplinx.com.cn > E-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > ------------------------------------------------------------------------ > > _______________________________________________ > Davinci-linux-open-source mailing list > Davinci-linux-open-source@linux.davincidsp.com > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source >
_______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
