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Gladdle
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Joined: 27 Jul 2008
Posts: 306
Location: Cleebronn, Germany
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 Posted: Thu Oct 19, 2023 1:37 pm Post subject: Questions about Gentoo (or GenPi64) @ Raspberry Pi 5 |
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Hi there, my Raspberry Pi 4 is broken, the network adapter is (physically) dead. So i want to have the new Raspberry Pi 5 in the next few days, but i have serval questions about installing Gentoo on that. I only want to have a home Server without a monitor, so the HDMI and graphic chip doesn't matter for me! Gentoo is fast as hell and i love this distribution so i want to have it on my home server.
| NeddySeagoon wrote: | There is no 32 bit to 64 bit upgrade path. It's a reinstall.
Running a 32 bit userland on top of a 64 bit kernel works.
ARM does not have multilib, so if you go all 64 bit, 32 bit apps will not run. |
I found that post on the forum here, and i need the oracle jre for some reasons, but there is a version for 64bit. And if i don't want to play old games there is no reason to use 32bit, or am i wrong?
Can i use the GenPi64 Project and modifiy the /etc/portage/make.conf makeopts for the new processor, then reinstall the whole system? Or shall i wait until a RasPi5 Version is releaised? What about the M.2 Adapter, have i make a new kernel with that driver or maybe that could be a problem?
Or maybe anyone got some useful informations for me for this project?
Sorry for my bad english, it's not my native language but i hope you all understand what i mean. |
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pingtoo
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Joined: 10 Sep 2021
Posts: 786
Location: Richmond Hill, Canada
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| Posted: Thu Oct 19, 2023 8:29 pm Post subject: |
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Gladdle,
If you are looking a ready made Gentoo for RPI5 you will be disappointed. I have not found such thing yet.
However if you take apart of the entire OS into smaller chunk you may be easier to get to you ideal setting.
So my recommendation,
- Use Raspberry Pi OS kernel and its DTB.
- Load current Gentoo stage3 for ARM64
- Optional setup a cross build system on a more powerful machine for optimised stage3
Kernel is really just Linux mainline + Rasperry Pi patches for hardware, if you want Gentoo's patches it can come later once you have known working environment.
Rootfs, get current ARM64 stage3, it is targeted for generic ARMv8-a. Once you have a working Gentoo (either on RPI5 or crossdev) you can create new targeted to ARMv8,2+dotprod
GenPi64 is kind of outdated binary, if you load it you most likely want to bring it up to date which is for sure recompile everything. (And most likely several iterations)
GenPi64 kernel may not work for RPI5, because it will not have right driver for RP1 (the southern chip)[/list] |
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flysideways
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Joined: 29 Jan 2005
Posts: 368
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| Posted: Wed Oct 25, 2023 4:40 pm Post subject: |
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I'm in no hurry at the moment, there are 8gb Pi 4's available again. I have two on the way for a couple of PiHut Aluminum Armour cases that I bought a long time ago, still in the boxes needing Pi's.
I have no desire for an active cooling solution. I'd be happy with an updated Aluminum Armour case with all of the features of the Pi 4 version.
I am interested to see what NVME solutions come about. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 53562
Location: 56N 3W
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| Posted: Wed Oct 25, 2023 6:58 pm Post subject: |
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Gladdle,
In anticipation of getting a Pi5 by the end of the month, I wrote Raspberry PI Install Guide
I've tested most of it (once) on a Pi4 I had to reinstall after its SSD had to be repurposed.
The main aim was to get a system up without needing to chroot. It does that,
It was also supposed to be Pi model independent. The only thing to change for one Pi model to another is the stage3 that you require.
The Pi5 should run Pi4 code but a few optimisations will be missing. They are only a rebuild away.
Sakakis original GenPi64 is dead. The one you linked should be OK but it won't be Pi5 optimised yet.
Hence, use the Gentoo stage3 on top of the foundation binary kernel and GPU code.
I want passive cooiling, PoE and NVMe.
With single lane PCIe 2, NVMe isn't going to be any better than SATA, speed wise.
The selling point is that it fits inside the case.
I'm intending adding Pi5 code to my binhost once i can test it.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Last edited by NeddySeagoon on Fri Oct 27, 2023 7:11 pm; edited 1 time in total |
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flysideways
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Posts: 368
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 53562
Location: 56N 3W
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| Posted: Fri Oct 27, 2023 7:12 pm Post subject: |
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flysideways,
Thanks. I've fixed and tested the link now.
Feedback welcome.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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flysideways
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Joined: 29 Jan 2005
Posts: 368
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| Posted: Fri Oct 27, 2023 7:48 pm Post subject: |
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| Very good read and quite the time saver compared to how I got started with Gentoo on my Pi's. |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 53562
Location: 56N 3W
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| Posted: Sat Oct 28, 2023 12:05 pm Post subject: |
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Team,
I've tried to clear up some /dev/sda and /dev/mmcblk0 confusion pointed out by my first user feedback. Thank you.
The page is updated.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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antonellocaroli
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Joined: 11 Aug 2016
Posts: 494
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| Posted: Sun Oct 29, 2023 5:44 am Post subject: |
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@NeddySeagoon I currently use for rpi4 as CFLAGS
| Code: | | march=armv8-a+crc+simd -mtune=cortex-a72 -ftree-vectorize -O3 -pipe -fomit-frame-pointer |
what changes with rpi5? |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Mon Oct 30, 2023 3:14 pm Post subject: |
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antonellocaroli,
The Pi5 is armv8.2+crypto. Its a cortex-a76 CPU.
I don't have a Pi5 yet. Digging around and asking on IRC, I've discovered
| make.conf: | # Pi 5 is armv8.2-a+crypto
# armv8-a : Armv8-A : +fp, +simd
# armv8.1-a : Armv8.1-A : armv8-a, +crc, +lse, +rdma
# armv8.2-a : Armv8.2-A : armv8.1-a
# thats armv8-a+fp+simd+crc+lse+rdma+crypto
# Feature crypto implies aes, sha2, and simd, which implies fp.
# which expands to ...including implied features ...
# armv8-a+fp+simd+crc+lse+rdma+crypto+aes+sha2+simd
# From a real Pi 5 :)
# Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimdd
# What does the Hawk support?
#COMMON_FLAGS="-O2 -pipe"
COMMON_FLAGS="-mcpu=cortex-a76+crypto -O2 -pipe" |
That's from my RPi5 KVM build system.
The Pi4 KVM build system uses
| Code: | | COMMON_FLAGS="-mcpu=cortex-a72+crc -mtune=cortex-a72 -ftree-vectorize -O2 -pipe -fomit-frame-pointer -flto" |
Its got a lot more RAM than a Pi, so I don't mind -flto.
The Pi cache is tiny, so -O2 rather than -O3.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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antonellocaroli
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Joined: 11 Aug 2016
Posts: 494
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| Posted: Fri Nov 10, 2023 2:56 am Post subject: |
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@NeddySeagoon
I got the Rpi5 and it's already running, for CFLAGS I set it up like this:
| Code: | | CFLAGS="-march=armv8.2-a+crc+crypto -mcpu=cortex-a76+crc+crypto -mtune=cortex-a76 -ftree-vectorize -O2 -pipe -fomit-frame-pointer" |
should be OK?
| Code: | gcc -### -E - -march=native 2>&1 | sed -r '/cc1/!d;s/(")|(^.* - )|( -mno-[^\ ]+)//g'
-mlittle-endian -mabi=lp64 -mcpu=cortex-a76+crc+crypto -dumpbase - |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Fri Nov 10, 2023 5:04 pm Post subject: |
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antonellocaroli,
That looks about right. From my understanding of +crc is redundant but harmless.
What does resolve-march-native produce on a Pi 5?
You need version 3.0.0 or later as version 2.2.0 failed on my arm64 systems.
I still don't have my Pi 5 :(
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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antonellocaroli
Guru
Joined: 11 Aug 2016
Posts: 494
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| Posted: Fri Nov 10, 2023 5:27 pm Post subject: |
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| NeddySeagoon wrote: |
What does resolve-march-native produce on a Pi 5?
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| Code: | resolve-march-native
-mcpu=cortex-a76+crc+crypto |
Now I was playing around with the kernel configuration, and I saw a different entry in bcm2712_defconfig
| Code: | | CONFIG_ARM64_16K_PAGES=y" |
that when I compile for rpi3 and rpi4 always at 64bit
I had set to
| Code: | | CONFIG_ARM64_4K_PAGES=y |
I don't actually know which setting is better... |
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Gentoo on ARM
