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List:       linux-arm-kernel
Subject:    Re: The LCD controller gets FIFO underrun errors
From:       Cliff Brake <cbrake () accelent ! com>
Date:       2003-10-31 11:59:38
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On Friday 31 October 2003 06:50 am, Tatsuya Gouzu wrote:
>> - slow down the LCD frame rate.  TFT displays look good at much lower
>> frame rates, but I could never get the mfgr to tell me this was OK.
>
>Even if I tested DSTN double panel monochrome 4bpp mode LCD,
>when CF activate LCD draws a line about half of vertical lines.

Hmm -- to make sure I understand, this is a 640x480x4bpp display?  I would not 
expect this to flicker as 640x480x8bpp displays seem to work just fine.  I 
would scope the CF bus cycles and make sure they are not excessively long -- 
refer to Jeff Sutherland's email about the RDY(wait) pullup resistors.

>> - use sync flash (like Intel sync strataflash)
>
>The system mounts flash(Intel strataflash) with MTD block device which
>file system is jffs2.
>This has also same problems. When write flash through the jffs2
>CRT(or LCD) flickers. (But quite better than CF)

I was about to say sync strataflash might help you here, but writes to sync 
strataflash are done in async mode.  Read performance will be better, but not 
write.  Again, spacing the writes out in software might help.

Cliff

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