Alan Cox wrote:
On Iau, 2006-02-23 at 20:23 +0100, Rene Herman wrote:
Does 16MB still work? Gets the kernel out of the old ZONE_DMA. I suppose
not many people are really using that anyway anymore these days, but if
no downsides maybe?
Certainly the PAE kernel might as well do that and the AMD64 if it
doesn't already. There are complications however getting above 16MB
because 16bit protected mode (and maybe the BIOS helpers - I need to
check that) can't hit it.
INT 15/AH=0x87 (move from low to high) on a 386+ should work, according
to the documentation I have... Is PM16 used anywhere?
We also used to have people DMAing into static kernel buffers in older
days but hopefully that habit is now dead and gone because modules
sorted most of it out.
Good method to flush out any possible remaining users :-)
Rene.
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