svn commit: r191362 - head/sys/powerpc/booke

[Rafal Jaworowski]

On 2009-04-21, at 19:04, Marcel Moolenaar wrote:

> Author: marcel
> Date: Tue Apr 21 17:04:01 2009
> New Revision: 191362
> URL: http://svn.freebsd.org/changeset/base/191362
>
> Log:
>  o  Properly set ksym_start & ksym_end when options DDB is set.
>     Include opt_ddb.h for that. Now you can actually boot with
>     -d and set breakpoints using function names.
>  o  Make sure to include opt_msgbuf.h.
>  o  Carve out the first 1MB of physical memory. The MPC85xx has
>     DMA problems with addresses below 1MB. Ideally busdma knows
>     how to avoid allocating below 1MB for MPC85xx, but that
>     requires a bit more work. For now, ignore the 1MB of DRAM.

Could you elaborate a bit on the last item? What is the faulty  
scenario, is this a known h/w defect documented somewhere?

Rafal