Re: LFS-R13.0 on RPI 4 and 5

Am 18.08.26 um 03:56 schrieb Pocket ([email protected] via
lfs-support Mailing List):
> 
> 
> On 8/17/26 17:10, Rainer Fiebig ([email protected] via lfs-support Mailing
> List) wrote:
>> Am 17.08.26 um 22:26 schrieb Pocket ([email protected] via
>> lfs-support Mailing List):
>>>
>>>
>>> On 8/17/26 14:54, md ([email protected] via lfs-support Mailing
>>> List) wrote:
>>>> Hi,
>>>>
>>>> Do I understand correctly that you took the x86_64 (default) LFS
>>>> branch and
>>>> patched it to build on arm64 (aarch64)?
>>>
>>> Yes that is correct
>>>
>>>> Could you comment how many changes were needed compared to this failed
>>>> attempt
>>>> https://github.com/marcindulak/jhalfs-ci/issues/1 from 2022?
>>>>
>>>
>>> gcc and binutils, used gcc flags is the brunt of the changes.
>>> added one sed for the lib64 issue.
>>>
>>>
>>>> The question to the LFS maintainers:
>>>> What is the state of arm64 support in LFS and JHALFS
>>>> (https://www.linuxfromscratch.org/alfs/)?
>>>>
>>>> Best regards,
>>>> Marcin
>>>>
>>>
>>> The answer you will seek will be we only do x86_64/amd64
>>
>> Would be understandable.  They even had to drop the SysV-version for
>> lack of man-/editor-power.
>>
>> But congrats on your achievement!  However, I do think that you should
>> tell us the SBU for your Pi-5.  Seems that I'm not the only one who is
>> interested in that.  Now that your build is complete, just run the
>> binutils-build again with a DESTDIR-installation and let us know.  Or
>> would that lock-up your device for too long?  Thanks.
>>
>> Rainer
>>
>>>
>>>
> 
> This is the information I have on the binutils=pass-1 build
> It is the log file which is created at the beginning of the build
> and I do a touch when the compile is complete.
> 
> stat 035-binutils-pass1
>   File: 035-binutils-pass1
>   Size: 188096          Blocks: 368        IO Block: 4096   regular file
> Device: 0,55    Inode: 9603841     Links: 1
> Access: (0644/-rw-r--r--)  Uid: ( 1000/   pocket)   Gid: ( 1000/   pocket)
> Access: 2026-08-16 07:47:23.332251322 -0400
> Modify: 2026-08-13 18:18:50.776579859 -0400
>  Birth: 2026-08-13 18:16:19.955848609 -0400
> 
> So Modify time - Birth time gives about 2 minutes.

I just built binutils-2.46.0 on my Ryzen 5700G BLFS-system, using the
instructions for an LFS-pass-1-build.  The build was scripted,
explicitly "make -j1" and included unpacking and a DESTDIR-installation.
 From the log:

Di 18 Aug 2026 08:23:01 CEST
****************************
'./binutils-2.46.0.tar.xz' -> '/usr/src/binutils-2.46.0.tar.xz'
08:23:01 - binutils-2.46.0.tar.xz
08:25:19 - binutils-2.46.0 installed

That's about 2:18 min.

According to [1], the 5700G's single-thread-performance is 3,282.
That of the ARM Cortex-A76 is 1,341 [2]

So I think that under the same conditions the SBU of an ARM Cortex-A76
system would be about twice that of an AMD 5700G system.  Which is
better than I expected.  Thanks.

Rainer


[1] https://www.cpubenchmark.net/single-thread
[2] https://www.cpubenchmark.net/single-thread/page4

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