get the reserved memory

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Hi,
I 'm trying to remap the memory I reserved at boot time for DMA buffer.
Using LILO and the mem=40M to allow 40M for the system, and I would like
to access the memory after.
I've read that I have to do : ioremap(0x2800000/*40M*/, ... but I'm not sure I access to the good memory region.
Does somebody know the good method to reserve large memory region ?
I'm using 2.6 kernel.



Thanks Nicolas

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