Hi all,
What is the difference between the following memory allocations.

1) Memory allocation by doing,
??????char *buf;
????? buf = kmalloc(BUF_LEN, GFP_DMA | GFP_KERNEL);

2) And by
????? char *buf;
????? buf = dma_alloc(...);

in the link http://www.arm.linux.org.uk/developer/memory.txt
it says that dma_alloc() returns virtual address in "ffc00000-----fffeffff"
this region,

while?in the first case it is returning Virtual address in "low-memory"
region.

For DMA mappable memory which one we should use..?

Hi Sandeep

Please have a look at these two API;s below.
http://lxr.linux.no/#linux+v3.0/Documentation/DMA-API-HOWTO.txt

http://lxr.linux.no/#linux+v3.0/Documentation/DMA-API.txt



-- 
Warm Regards,
Ravi Kulkarni