ISP problems when running from JFFS filesystem

chrisw957

Other Parts Discussed in Thread: TVP5150

I have an overo with a tvp5150 connected for video capture with the ISP. I'm using the PSP 2.6.32 kernel.

If I boot the system with filesystem in my micro sd card, I get a good capture. If I copy everything to nand, and boot, I get jittery video and errors about "isp_wait: wait is too much" and "ccdc 1won't become idle". This happens even if I wait for jffs2_gcd_mtd4 process to finish before I launch my application, so it doesn't seem directly related to cpu load.

I also get similar results if I try to also capture audio at the same time as the video.

I tend to think it is interrupt related? Any assistance would be greatly appreciated. I'm not sure how to go about debugging the problem.

-chris

over 14 years ago

0 Jeff Hayes over 14 years ago

TI__Expert 6850 points

Chris,

I am assuming you are referring to a Gumstix Overo. As such, TI does not support 3rd party hardware. You will need to either rely on the community to help you on this question or contact Gumstix for support, directly. Good luck in your efforts.

0 chrisw957 over 14 years ago in reply to Jeff Hayes

Intellectual 480 points

My question is omap35xx related. I have the same problem on the TI evm, so it is not overo related.

0 Steve Kipisz over 14 years ago in reply to chrisw957

TI__Genius 15510 points

You might want to look at write performance of NAND vs. MMC. Take a look at http://processors.wiki.ti.com/index.php/AM35x-OMAP35x-PSP_03.00.01.06_Feature_Performance_Guide for performance numbers. This is on the EVM with the TI software release.

Steve K.

0 Shriharsh Datar over 14 years ago in reply to Steve Kipisz

Intellectual 445 points

According to the performance figures of NAND write with jffs2 filesystems, it seems that the cpu load is 100%.

We do have same problem with video jerks when we are accessing the jffs2 filesystem.

Kernel is linux 2.6.32 from arago for Davinci DM365.

Any solution for this???

Regards,

Shriharsh

0 chrisw957 over 14 years ago in reply to Shriharsh Datar

Intellectual 480 points

In my test, I wasn't writing to NAND, I just had my primary filesystem in NAND. I had a sdcard mounted (ext3) which I was writing the avi format video on.

Anyway, when I changed from JFFS2 on the NAND to UBIFS, performance seemed to improve. Maybe you can try UBIFS.

-chris

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ISP problems when running from JFFS filesystem