On Thu, Nov 05, 2015 at 10:02:26AM -0500, Lennart Sorensen wrote:
> On Thu, Nov 05, 2015 at 09:57:25AM -0500, Lennart Sorensen wrote:
> > On Thu, Nov 05, 2015 at 09:51:59AM -0500, Lennart Sorensen wrote:
> > > Hmm, I thought I had read that as of 2.6.38 and higher arm systems were
> > > supposed to not generate the fault anymore, but maybe I misunderstood
> > > it and they meant it sets fixup to enabled by default.
> > >
> > > I should check the SCTLR.A flag.
> >
> > Of course the arm docs say it is off by default at reset, so something
> > in either u-boot or the kernel seems like it must have to enable it
> > explicitly. Well once I figure out how to read it I guess I will know.
> >
> > Of course if the memory happens to be flagged as something other than
> > normal memory, then it should also fault. I wonder if a page used to dma
> > data to/from a network driver would be flagged as normal memory or not.
>
> Would using this cause such a problem:
>
> /usr/include/xenomai/native/heap.h:#define H_DMA 0x100 /* Use memory
> suitable for DMA. */
Do you have alignment issues with the same version of Linux with
exactly the same configuration, but without Xenomai?
--
Gilles.
https://click-hack.org
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