RTEMS ARMv8 Query

[Joel Sherrill]

On Mon, Feb 29, 2016 at 9:54 AM, Raghav Nayak <raghav.nayak at nxp.com> wrote:

> Hi Joel,
>
>
>
> After bootstrap if I want to add something for configure do you have any
> steps?
>
>
>

Normally, I configure something like this in a separate build tree:

mkdir b
cd b
../rtems/configure --target=CPU-rtems4.12 --enable-rtemsbsp=XXX
--enable-tests=samples --disable-networking
make

CPU and BSP get replaced appropriately.

But there is NO aarch64 code in RTEMS right now. If you have a specific
board in mind and do a BSP for it,
you could use the arm-rtems4.12 tools and treat the CPU core on that BSP as
an ARMv7.

To do anything ARMv8 specific is going to require work somewhere. aarch64
needs a port
and a BSP. arm 32-bit armv8 will start with by treating the board as armv7
and possibly
adding a multilib variant to gcc to get access to specific instructions
that are desirable.

--joel



> With Regards
>
>   Raghav
>
>
>
> *From:* Joel Sherrill [mailto:joel at rtems.org]
> *Sent:* Monday, February 29, 2016 9:14 PM
> *To:* Raghav Nayak
> *Cc:* Chris Johns; Sebastian Huber; users at rtems.org
>
> *Subject:* Re: RTEMS ARMv8 Query
>
>
>
>
>
>
>
> On Mon, Feb 29, 2016 at 3:22 AM, Raghav Nayak <raghav.nayak at nxp.com>
> wrote:
>
> Hi,
>
> I could build the armv8 toolchain properly but do I need to do anything
> else to build RTEMS other than providing the toolchain path
>
>
>
> There is no 64-bit aarch64 port of RTEMS. One would have to be written.
>
>
>
> In the mean time, you can run 32-bit ARMv7 code on the same CPU but not
> take advantage of newer instructions in 32-bit ARMv8 mode.
>
>
>
> With Regards
>  Raghav
>
> -----Original Message-----
> From: users [mailto:users-bounces at rtems.org] On Behalf Of Chris Johns
> Sent: Saturday, February 27, 2016 9:12 AM
> To: joel at rtems.org; Sebastian Huber
> Cc: users at rtems.org
> Subject: Re: RTEMS ARMv8 Query
>
> On 27/02/2016 7:16 AM, Joel Sherrill wrote:
> >
> > Chris.. hopefully you have time this weekend to do some quick (for
> > you) RSB work. :)
> >
>
> Yes, I will do this once the next gcc snapshot is made which should be in
> a day or so.
>
> >   + Jeff Johnston just cut a newlib snapshot which includes two things
> > I wanted.  So the tools in general need to bump for this.
> >   + I sent you the two patches for binutils. Hopefully he can use them
> > to add the aarch64-rtems and x86_64-rtems targets to the RSB.
>
> I will add this to rtems-tools.git/tools/4.12.
>
> Chris
>
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