Re: [Xenomai] ARM bus error due to alignment

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

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