Mailing lists / lazarus / 2016-03
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While preparing fpc(laz)up for my RPi3, I did encounter an error with Lazarus.
Choosing a64 as CPU target in Lazarus does not work on my system. Manually (command line) choosing aarch64 as CPU target however, does work.
Am I doing something wrong ?
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Alfred wroteWhile preparing fpc(laz)up for my RPi3
Quick action! They are sold out now everywhere I looked...
While preparing fpc(laz)up for my RPi3, I did encounter an error with Lazarus. Choosing…
Alfred wroteWhile preparing fpc(laz)up for my RPi3, .... Choosing a64 as CPU target
I am exited to see that there is a very cheap testing platform for a64 arch !
Question: can a64 hardware and Linux run a32 programs (like X64 systems can run X32 programs) ?
-Michael
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AFAIK This is the default mode on RPi for now, same for ODroid C2, it also currently runs a64 cpu with a a32 kernel, 'real' 64bit support will come later.
Michael
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Michael Ring wroteAFAIK This is the default mode on RPi for now, same for ODroid C2, it also currently runs a64 cpu with a a32 kernel, 'real' 64bit support will come later.
So Alfred will only be able to run 64 Bit Lazarus programs after updating the OS to a 64 bit version.
-Michael
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I asked on the RPi forum but it appears thta a 64 bit Raspbian kernel is a bit away from nos. See:
https://www.raspberrypi.org/forums/viewtopic.php?f=66&t=138385
For all RPi's I use Arch Linux.
However, at the moment, no easy Arch aarch64 distro available for RPi3. URL: https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-pi-3 Therefor, I used the general libraries to build the aarch64 cross-compiler.
URL: https://archlinuxarm.org/platforms/armv8/generic.
But, we indeed all have to wait for a 64bit kernel.
For real (industrial) applications, i will use the ODroid C2 ! Its better than the RPi3 for my purposes.
However, the main question still stands:
How to setup Lazarus to compile for Aarch64 ??
Fpc does NOT know what to do with -Pa64.
Fpc does know what to do with -Paarch64.
AFAIK This is the default mode on RPi for now, same for ODroid C2, it also currently runs…
Michael Ring wroteAFAIK This is the default mode on RPi for now, same for ODroid C2, it also currently runs a64 cpu with a a32 kernel, 'real' 64bit support will come later.
So obviously the a64 hardware can run a32 code :-) .
Hence I suppose an a64 Linux distribution will come with the ability to run a32 user programs (but I did not yet read about this) .
-Michael
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That is what they say on the forum at least....
And they claim not so much is to be gained with 64 bit mode since RAM is just 1GB (currently).
For all RPi's I use Arch Linux. However, at the moment, no easy Arch aarch64 distro…
03.03.2016 09:47, Alfred ?????:
Please create a bug report.
FYI.
All my RPi(2) FPC/Lazarus apps do run unchanged on the new RPi3, by just replacing the boot firmware with the latest firmware.
They were (cross-)compiled for ARMV7 hardfloat and run on Arch Linux.
And .... boot is fast ... and ... my apps run FAST !!! So, this makes the change towards the new RPi3 hardware a very easy one, at least for 32 bit apps.
Now we wait for 64 bit ... ;-)
For all RPi's I use Arch Linux. However, at the moment, no easy Arch aarch64 distro…
[...] How to setup Lazarus to compile for Aarch64 ?? Fpc does NOT know what to do with -Pa64. Fpc does know what to do with -Paarch64.
Fixed. I replaced a64 with aarch64 in the IDE.
Mattias
On Thu, 03 Mar 2016 10:53:43 +0100, Michael Schnell That is what they say on the forum at…
Bo Berglund wroteAnd they claim not so much is to be gained with 64 bit mode since RAM is just 1GB (currently).
I suppose similar to X86-64, with aarch64 the speed advantage vs 32 bit is debatable.
Some applications that really do 64 bit calculation might get a lot faster
Some applications that use loops with a large code footprint might get slower, as the 64 bit code might be bigger and hence more cache loads might be necessary.
-Michael
On Thu, 03 Mar 2016 06:47:24 +0000 Fixed. I replaced a64 with aarch64 in the IDE. Mattias
Working !
Thanks very much.
I have now an aarch64 fpc(laz)up executable, compiled through Lazarus.
If a 64 bit RPi3 distro is available, I will report back !!
Fixed. I replaced a64 with aarch64 in the IDE. Mattias
I ordered also one in the hope using it to play with fpc aarch64. But currently it does not look good as it seems that it is not only a matter of the kernel but also the firmware. At least I didn't unwrap mine yet because of this, without aarch64 support I see no use for me in it.
Then, perhaps, the ODROID-C2 could be your toy for aarch64 !
Especially the eMMC connector makes it very suitable for reliable embedded (FPC) applications.
As well as its 2Gbyte SDRAM and Gigabit Ethernet.
Arch has 64 bit ready:
https://archlinuxarm.org/platforms/armv8/amlogic/odroid-c2
But, with the RPi3, you can reach a much wider audience. Which is my goal with the Pi.
I ordered also one in the hope using it to play with fpc aarch64. But currently it does…
A friend of mine uses BeagleBone and he always upgrades the devices to a standard Debian distribution.
I don't see why this should not be possible / viable with RPI .
And I suppose there is an aarch64 Debian. (In any case it should be possible to build it (a time consuming process ;-) )
So this hold run on a RPI3 for testing purpose.
Supposedly some 64 Bit drivers for certain hardware on the RPI might be no yet available. but this should not hamper fpc / Lazarus testing .
-Michael
I ordered also one in the hope using it to play with fpc aarch64. But currently it does…
So how's this set up: the same as Debian SPARC with a 64-bit kernel and 32-bit userland?
Then, perhaps, the ODROID-C2 could be your toy for aarch64 ! Especially the eMMC…
Alfred wroteThen, perhaps, the ODROID-C2 could be your toy for aarch64 !
It is even not available yet? At least not at a reliable store in germany as far as I know.
Especially the eMMC connector makes it very suitable for reliable embedded (FPC) applications. As well as its 2Gbyte SDRAM and Gigabit Ethernet.
All this is not really needed for playing with fpc.
While preparing fpc(laz)up for my RPi3, I did encounter an error with Lazarus. Choosing…
Hello,
I would like to inform you that Lazarus / FPC runs smooth on an Odroid-C2 under aarch64 (arch linux).
Proof:
https://drive.google.com/file/d/0B96fg3TpL5RDWnJiMUwyQ21hM00/view?usp=sharing
I hope that RPi3 will follow soon !
Many thanks for the good work !!!
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GREAT !!!
Many thanks for the good work !!!
+1 !
-Michael
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