Looking at memory maps, it's the DDR controller Peripheral Bus Burst Priority Register.
Default is FF and this looks to set it to 10: "Priority raise old counter. Specifies the number of memory transfers after which the DDR2/mDDR memory controller will elevate the priority of the oldest command in the command FIFO. This bit field must not be set to 0xFF." It also says: "Note: Due to an internal DM35x hardware issue, you must not accept the default bit field value for PR_OLD_COUNT. The default bit field value for PR_OLD_COUNT is 0xFF, you must change the value of PR_OLD_COUNT to a value other than 0xFF." Useful! Shame the EVM kernel + bootloader don't implement this! -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Phil Quiney Sent: 30 June 2008 10:30 To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [email protected] Subject: RE: Noise on DM355 LCD interface! Hi, Beats me - someone at TI sent us the program & told us what to 'poke' ;-) I would guess the register setting is to do with bus priorities....??? 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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: 30 June 2008 10:10 To: Phil Quiney; [EMAIL PROTECTED]; [email protected] Subject: AW: Noise on DM355 LCD interface! Hi Phil, thanks for the hint - it's working fine. But what does that line do. Ok, I'm writing the Value 10 to address 20000020 - but i don't know which register i'm explicit changing here. Regards Tino. Mit freundlichen Grüßen i.A. Tino Hoffstädt Hardwareentwicklung / Hardware Development Tel.: +49 (0)30 769929 - 0 Fax: +49 (0)30 769929 - 12 [EMAIL PROTECTED] GSP Sprachtechnologie Gesellschaft für elektronische Sprachsysteme mbH Teltowkanalstr. 1 D-12247 Berlin www.gsp-berlin.de Registergericht: Amtsgericht Berlin Charlottenburg, HRB-Nr.: 22455 Geschäftsführer: Dr. Helmut Loebner -----Ursprüngliche Nachricht----- Von: [EMAIL PROTECTED] cidsp.com [mailto:[EMAIL PROTECTED] ux.davincidsp.com]Im Auftrag von Phil Quiney Gesendet: Montag, 30. Juni 2008 09:59 An: serkan erdogan; [email protected] Betreff: RE: Noise on DM355 LCD interface! Hi, Yes it does that ;-) Use the attached program to fix it.... Put a 'writeb 20000020 0 10' into the system start up & the flicker will stop. 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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of serkan erdogan Sent: 30 June 2008 08:14 To: [email protected] Subject: Noise on DM355 LCD interface! Hii All, i am a member of dm355 software developer team in my company. we have a problem with the noise appearing when we starting a software on dm355. we are using paralel lcd interface (but the problem is same for SVIDEO and COMPOSITE outputs with analog lcds) and when our software doing a lot of memory copy and move the screen is getting very noisy. I have tested this by different king of software and gui and math libraries. All time during the first startup of software and the memory activity is getting higher the noise is reaching the top level. All time when ddr ram activity is high (linux memory copy and move actions) the noise coming high. Otherwise noise is still standing on the screen but sometimes it becomes intolerable. How can we solve this problem ??? Is there anybody have this problem too?? The noise is appearing as some block of pixels beginning to zigzag horizontally and some thin group of pixel lines are sliding on screen horizontally again. After the succesfull starting of the software the noise is getting very very lower. But when another high memory activity happens the noise is getting higher again. My kernel is default montavista linux kernel 4.0 i have done the software updates but the problem is still exists. Thank you very much for help ad reading. I need all advices and ideas to consider on. Serkan Erdogan _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source Racelogic is a limited company registered in England. Registered number 2743719 . Registered Office Unit 10, Swan Business Centre, Osier Way, Buckingham, Bucks, MK18 1TB . The information contained in this electronic mail transmission is intended by Racelogic Ltd for the use of the named individual or entity to which it is directed and may contain information that is confidential or privileged. 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