On Mon, 19 Mar 2007 15:48:21 +0000, Ralf Baechle <ralf@xxxxxxxxxxxxxx> wrote: > > 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. Hmm... So do you think making ZONE_DMA customizable for each platform (or user configurable) would have some sense? For these legacy(?) PCI cards, we can check if it works or not by pci_set_dma_mask(), at least. --- Atsushi Nemoto
