[ELDK] Facing some problem with dma alloc coherent

[Zaahir Khan]

Hello,


I am using customized board based on sequoia and using linux 2.6.24.2 kernel
eldk version 4.2.

Working on DVR driver.

when  doing     dma_alloc_coherent

  "return" -----      virtual address for allocated area

  dma_handle -----   physical address for "return" address
( as per my understanding)

When doing virt_to_phys to "return" address not getting value as dma_handle

DVR driver will alloc and then do mmap.

In that it will take convert the "return" address to physical

and use in remap_pfn_range...

May be due to this mis-match DVR app is crashing....

Please suggest !!!!!


Thanks & regards,

Zaahir Khan