RTEMS ARMv8 Port

[Raghav Nayak]

Hi Joel,

I could build to some extent and when it comes to application it says
“error: Cannot change output format whilst linking AArch64 binaries”.

Any hints to resolve this problem ? Thanks

With Regards
  Raghav

From: Joel Sherrill [mailto:joel at rtems.org]
Sent: Wednesday, March 16, 2016 6:05 PM
To: Jan Sommer
Cc: rtems-users at rtems.org; Raghav Nayak
Subject: Re: RTEMS ARMv8 Port


On Mar 16, 2016 7:26 AM, <soja-lists at aries.uberspace.de<mailto:soja-lists at aries.uberspace.de>> wrote:
>
> Am 2016-03-16 10:32, schrieb Raghav Nayak:
>>
>> Hi,
>>
>> I am trying to configure RTEMS for ARMv8 target. Tried running the
>> following command:
>>
>> ../configure --target=aarch64-rtems4.12 --enable-rtemsbsp=raspberrypi
>> --enable-tests=samples --enable-networking --enable-posix
>> --prefix=/mnt/FSL/pandora/rtems/rtems-armv8-bsp/4.12
>>
>
> I am no expert in this, but I highly doubt that this is supposed to work.
> So far you only have a cross-compiler for RTEMS for the aarch64 target.
> However, as ARMv8 is a new architecture for RTEMS I would expect that you need to first add support for this new architecture to the RTEMS-kernel and probably the configure scripts as well. I have never done this, so I can't help here. The RTEMS porting guide might be a first step in understanding what you have to do: https://docs.rtems.org/doc-current/share/rtems/pdf/porting.pdf
>
> Another thing is that you want to build the raspberrypi-bsp. I assume you want to build RTEMS for the raspberry pi 3. The new raspberry uses another cpu as the older versions and of a different target architecture. That means from the operating system's point of view it differs significantly from the older ones, thus you cannot expect that the bsp for the RPi 1 and RPi 2 will work for the RPi 3.
> No one has added support for the RPi 3 yet. It's very new on the market and RTEMS has currently no ARMv8 support.

That's the basics. A new architecture requires adding score/cpu/aarch64 and a new BSP for that architecture c/src/lib/libbsp/aarch64/NEWBSP. I added the GNU tools support.

I did notice that gdb has a simulator for aarch64 which means a BSP for that is simple to construct. The gdb simulator is similar on all architectures and we have BSPs for a variety to use as examples. This would be enough to debug core functionality on the aarch64 and run the tests without interrupt support.

Then you have to add interrupt support and move to real HW and add a second BSP.

>> But not able to get the output something like this:
>>
>> target architecture: aarch64.
>> available BSPs: raspberrypi.
>> 'make all' will build the following BSPs: raspberrypi.
>> other BSPs can be built with 'make RTEMS_BSP="bsp1 bsp2 ..."'
>>
>> config.status: creating Makefile
>>
>>
>> Do you have any clues?
>>
>>
>> With Regards
>>   Raghav
>>
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