Re: why DMAable memory restriction ?

[Alan Cox]

> In the linux kernel there is a limitation on the
> amount of contiguous DMAable memory that can be allocated
> (I guess about 128K). Does anobody know what is the reason

128K or so , if you are lucky. 

> for such a restriction ? Is there any plan to remove

Because the pages are contiguous so you have to find a suitable sized piece
of free memory

> this restriction in the future releases of kernel ?

Nope. 2.4 adds bootmem though so badly designed hardware that is compiled in
can grab memory early in biggish chunks.