Failed to alloc 4M DMA memory in the 256M system

[Zhu, Yijun (NSN - CN/Beijing)]

Hi All:

I try to alloc 4M memory for the DMA purpose in the 256M system running
V2.6.29. But failed.

I check the system, there is no 4M DMA memory in the DMA zone free list
indeed, So I'd like to
ask for that Is it possible for me to alloc 4M(or larger) DMA memory in
the linux system. 
if YES, HOW?

I forgot to say my hardware is based on X86. 

Thank you in advance.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/