64KB for 8-bit DMA; 128KB for 16-bit DMA. It's a limitation of the
legacy third-party-DMA controllers, which had only 16-bit address
registers (the high part of the address lives in a non-counting
register). This doesn't apply to bus-master DMA, just the legacy
(8237) stuff. There was also a 24-bit address limitation.
-- /Jonathan Lundell. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/