Re: USB problems after memory upgrade

[Matthias Scheler <tron%zhadum.org.uk@localhost>]

On Sun, Sep 11, 2011 at 05:34:31PM +0100, David Brownlee wrote:
> How hard would it be to provide a kernel option to specifically
> allocate the highest possibly memory locations for devices, to try to
> flush out such issues?

I don't think it would be very hard. You would only have to divide the
physical memory into e.g.  1GB blocks and assign the highest priority
to the block with the highest address.

NetBSD/amd64 divides memory into blocks to preserve low memory for
32Bit DMA transfers. So there should be code which does something similar.

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/