lkml.org 
[lkml]   [2002]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Busmaster DMA broken in 2.4.18 on Alpha
On Mon, Mar 11, 2002 at 10:02:00AM -0500, Jay Estabrook wrote:
> There are ISA cards, regardless of what ISA bus machine they are
> plugged into, that are able to generate only something less than
> 32-bits worth of address.

Indeed, I missed that.

> Since ISA devices don't have pci_dev structures, there's (currently)
> no way to pass an ISA device-dependent DMA mask to the IOMMU routines.
> Perhaps there needs to be an addition to the API that would allow
> for this (pci_set_isa_device_dma_mask()) ???

Yes, it would be nice to have something like this.

Another workaround also seems to be possible - for ISA devices
use mask other than 0x00ffffff _only_ if we don't have working
IOMMU. This doesn't help to get older Miatas work with such
type of ISA cards though...

Ivan.
-
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/

\
 
 \ /
  Last update: 2005-03-22 13:24    [W:0.075 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site