2010-10-29 12:35:17     DMA buffer size

Document created by Aaronwu Employee on Aug 23, 2013
Version 1Show Document
  • View in full screen mode

2010-10-29 12:35:17     DMA buffer size

Y F Michael Kou (UNITED STATES)

Message: 95401   

 

We are moving to a 5M pixel CMOS using the PPI. When I looked at the kernal menuconfig, the DMA size max out at 4M, do I need to change the DMA memory size to at least 5M for the 5M CMOS? Also, any pointer as to which program in the kernel to change the memory size ?

 

Thanks.

 

 

 

Michael Kou

QuoteReplyEditDelete

 

 

2010-10-31 23:02:25     Re: DMA buffer size

Sonic Zhang (CHINA)

Message: 95430   

 

Yes, you need to enlarge the uncacheable memory region, which is used for DMA.  You should add a 8M option to both arch/blackfin/Kconfig and arch/blackfin/include/asm/bfin-global.h

QuoteReplyEditDelete

 

 

2010-11-01 08:22:53     Re: DMA buffer size

Y F Michael Kou (UNITED STATES)

Message: 95444   

 

Thanks for the pointer. I will do that.

QuoteReplyEditDelete

Attachments

    Outcomes