Messages in this thread | | | From | Oliver Neukum <> | Subject | Re: Can we remove the Zone_DMA? | Date | Sun, 4 Apr 2010 09:31:00 +0200 |
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Am Sonntag, 4. April 2010 06:21:54 schrieb tek-life: > In Linux , The Memory is divided to three zone. They are ZONE_DMA > 、ZONE_NORMAL and ZONE_HIGHMEM. From the book of "Undstand the Linux > kernel ", the ZONE_DMA has the effect that the Direct Memory Access > (DMA) processors for old ISA buses have a strong limitation: they are > able to address only the first 16 MB of RAM. SO ,we must set a zone > for the DMA on ISA bus. And I suspect that the hardware has > developed so quickly .And in this days the ISA has been weeded out.
Floppy disks & paralell ports still use DMA
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