On Wednesday 12 November 2008 12:23:14 pm Marc Lörner wrote: > Hello, > I just stepped over a problem with my IDE disk running in DMA-mode > and having more than 4GB of RAM. > It seems that the whole way down GEOM, ata-disk, ata-dma never is checked > whether physical address of buffer is less than 4GB an so fits in 32bits. > => when PRD is set the address is rigorously truncated to fit into 32bit, > with buffer < 4GB all is quite fine.
bus_dmamap_load() in ata-dma.c should result in bounce pages being allocated and having the data copied to pages below 4GB and having those addresses passed to the callback and stored in the PRD. -- John Baldwin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
