Hi, The 10 buffers were an experiment, we normally use 6. Within our application framework we can do video manipulation (such as mirror/rotate) and to do this requires extra buffers. As any particular buffer can end up being written to the screen they all need to be allocated the same way. The 6 buffers is a 'worst case' scenario, the increase to 10 was just a check to see if frame rate could be improved by having extra buffers available.
I have never bothered with the demos - as far as we are concerned a working VGA framebuffer is all that is needed on the DM355. ;-) Regards Phil Q Phil Quiney, Senior Software Engineer Trinity Convergence Cambridge Business Park Cowley Road Cambridge CB4 0WZ, UK T: +44(0)1223-435536 F: +44(0)1223-435560 www.trinityconvergence.com -----Original Message----- From: Jaswinder Singh [mailto:[EMAIL PROTECTED] Sent: 17 September 2008 11:46 To: Phil Quiney Cc: amingaming; davinci-linux-open-source@linux.davincidsp.com Subject: RE: about LCD? Hello Phil Q, On Wed, 2008-09-17 at 11:31 +0100, Phil Quiney wrote: > The values originate from the spruf73a.pdf document that came with the > updated LSP. > > It provides 3x D1 PAL buffers (720x576) not very exactly. An exact fit would > be 2430K, which is (720x576x2x3)/1024. > Yes, I also made similar guess. I am surprise why TI is not disclosing these information. For DM355 : spruf73a.pdf and for DM6446 : sprue66d.pdf they only show boot settings for PAL. I think they should tell the procedure to calculate buffers for video and osd based upon user resolution. So that user can use it as per their resolution. DM6446 and DM355 is having limited memory if we set wrong or more value for buffers it is just wastage for memory. > We have used configurations with 10 buffers of NTSC, so it then becomes > 720x480x2x10/1024 = 6750K. > hmm, what is the idea behind 10 buffers ? I think you miss this question: Are you able to play DVEVM demos by using VGA LCD ? Thank you for help, Jaswinder Singh. _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
