RTEMS ARMv8 Query

[Raghav Nayak]

Hi Joel,

I tried build RTEMS with RSB ARMv8 Toolchain & getting following error:
checking whether the C compiler works... no
configure: error: in `/mnt/FSL/rtems/rtems-git/build/aarch64-rtems4.12/c/raspberrypi2':
configure: error: C compiler cannot create executables
See `config.log' for more details

Could you please provide some info to resolve this error

Thanks and With Regards
  Raghav



From: Joel Sherrill [mailto:joel at rtems.org]
Sent: Monday, February 29, 2016 10:59 PM
To: Raghav Nayak
Cc: Chris Johns; Sebastian Huber; users at rtems.org
Subject: Re: RTEMS ARMv8 Query



On Mon, Feb 29, 2016 at 9:54 AM, Raghav Nayak <raghav.nayak at nxp.com<mailto: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<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<mailto: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<mailto: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<mailto:users-bounces at rtems.org>] On Behalf Of Chris Johns
Sent: Saturday, February 27, 2016 9:12 AM
To: joel at rtems.org<mailto:joel at rtems.org>; Sebastian Huber
Cc: users at rtems.org<mailto: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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