On Tue, Mar 20, 2007 at 12:09:47AM +0900, Atsushi Nemoto wrote: > Some ZONE_DMA patches were merged in 2.6.21. On most MIPS, ZONE_DMA > is not needed, isn't it? > > Currently JAZZ, MALTA, QEMU, IP22, SNI_RM, RBTX4938 defines > GENERIC_ISA_DMA so they may need ZONE_DMA (though I wonder QEMU or > RBTX4938 really need it...) > > Are there any other platforms requires special DMA zone? Qemu supports more or less the full PC braind^Wheritage, including the good old too-old floppy controller. IP22 supports Indigo 2 systems which have EISA support, so we only want ZONE_DMA if EISA is enabled. For a bunch of other systems ZONE_DMA may be required to support b0rked PCI cards that only support like 31-bit DMA addresses or even less. Ralf
