Hi, I have a custom board with DaVinci DM6443 with kernel TI LSP 2.0.0.140 (MV 2.6.18), DVSDK 2.0.0.22 and TI gStreamer for video / audio playback. In parallel to the playback there is a HTTP and a FTP server running on the ARM. The HTTP server is used to configure the board via web browser and the FTP server is used to do content uploads.
Now I received the first boards with silicon rev 2.1 (TMS320DM6443A). All these boards have the same problem. When the HTTP server (as long as the user is configuring the board) or FTP server (as long as the user is uploading new content) is working in parallel to video playback, I get audio dropouts at the line out. Just doing video / audio playback works fine. I guess, this has something to do with the extra system load caused by the servers. Playing around with nice levels of the servers did not help. I don't have this problem with silicon revision 1.3. The only difference between both systems is just the silicon rev. of the DaVinci (same hardware, same firmware). I found this in the Silicon Errata: http://focus.ti.com/lit/er/sprz240m/sprz240m.pdf Page 8: 2.1.3 Audio Serial Port (ASP) Transfers Should be Buffered in Internal Memory For me it seems, this issue might be the root cause for the problem I came across? I guess, TI LSP doesn't use the internal memory to buffer audio? At least I didn't find it... I currently don't understand, why I have this problem with silicon rev 2.1 only. Does this make sense? In the archive of this list I found some patches for git kernel, which introduced usage of internal memory to avoid underrun on audio. I guess, this is what have to implement on my kernel as well? Has anyone done this before for MV 2.6.18 ? Unfortunately, I don't have the resources to switch to the git kernel at the moment. And AFAIK, video playback on DM644x is still not supported by TI DVSDK with git kernel. Thanks in advance! Kind regards Thomas _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
