DMA Cache problem on PPC8248.

Hi All,

   We are using PPC8248 provided by freescale and the kernel  2.6.10. I believe we have cache problem.

  We are allocating DMA buffers in our driver. If we increase the DMA buffer size the board hangs/halts(when try to load more applications).

  If we reduce the DMA buffer size, then we can run all our applications.

   Is there any way I can get around this problem.


Thanks
Jayasri

   We are using PPC8248 provided by freescale and the kernel  2.6.10. I believe we have cache problem.
  We are allocating DMA buffers in our driver. If we increase the DMA buffer size the board hangs/halts(when try to load more applications).
  If we reduce the DMA buffer size, then we can run all our applications.
   Is there any way I can get around this problem.

Have a look at the u-boot code for the 8245; I once submitted a patch
for such a problem on an XPC8245 (experimental MPC8245). It's still in
the code; but disabled right now.

It might be the same silicon bug.

-- 
  greetz, marc
Yeah, yeah, yeah nothing like a bomb to sober me up, I'm fine.
	Crichton - Suns and Lovers
crichton 2.6.26 #1 PREEMPT Tue Jul 29 21:17:59 CDT 2008 armv5tel GNU/Linux