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thegrind
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Joined: 22 Sep 2024
Posts: 8
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 Posted: Mon Oct 07, 2024 7:35 pm Post subject: [SOLVED] 16K page kernel on a raspberry PI 5 |
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I followed the wiki page to install Gentoo a RPI5 but for some reason it's not using the 16k kernel. As uname -r returns 6.6.50-v8+
. I downloaded the stage 3 for arm64 openrc and modified the config.txt to load the dtoverlay=vc4-kms-v3d-pi5. I did the mkswap for 16k and it gave me errors so I had to remake it with 4K. I am running headless for kodi using gbm.
Everything works well. Wifi bluetooth networking. I can't figure out where I went wrong on the kernel and how to fix it.
Last edited by thegrind on Tue Oct 08, 2024 2:07 pm; edited 1 time in total |
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Ralphred
Guru
Joined: 31 Dec 2013
Posts: 597
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| Posted: Mon Oct 07, 2024 8:35 pm Post subject: |
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Meh, Pi's be a law unto themselves.
What do your [insert prefix DuJour]*/cmdline.txt and [insert prefix DuJour]*/config.txt look like?
*Why [prefix DuYesterJour]/cmdline.txt and [prefix DuYesterJour]/config.txt aren't just fscking symlinks instead of a condescending lecture annoys me, and no "because fat" isn't an argument, it's the invalid excuse of a lazy peon**.
**Sorry, using Debian takes it toll... |
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pietinger
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Joined: 17 Oct 2006
Posts: 4938
Location: Bavaria
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thegrind
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Joined: 22 Sep 2024
Posts: 8
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| Posted: Mon Oct 07, 2024 9:36 pm Post subject: |
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Thanks for the help.
Here is my cmdline.txt
| Code: | | dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p3 rootfstype=ext4 rootwait |
Here is my config.txt
| Code: |
# have a properly sized image
disable_overscan=1
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d-pi5 |
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pingtoo
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Joined: 10 Sep 2021
Posts: 1155
Location: Richmond Hill, Canada
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| Posted: Mon Oct 07, 2024 10:32 pm Post subject: |
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thegrind,
| Quote: | | I followed the wiki page to install Gentoo a RPI5... |
Which wiki page? |
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thegrind
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Joined: 22 Sep 2024
Posts: 8
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flysideways
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Joined: 29 Jan 2005
Posts: 477
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| Posted: Tue Oct 08, 2024 1:18 am Post subject: |
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I followed this one last week, Raspberry Pi Install Guide to install Gentoo on this Pi 5.
My cmdline.txt for that Pi is
| Code: | | dwc_otg.lpm_enable=0 console=tty root=PARTUUID=c22a8b8b-0dda-47c7-b0c1-07a4c3ddb852 rootfstype=ext4 rootwait cma=256M@256M net.ifnames=0 usbhid.mousepoll=0 |
I added the mousepoll part to fix my Razer mouse, I also used the root PARTUUID, otherwise it is as found in the guide.
The config.txt
| Code: |
# If using arm64 on a Pi3, select a 64 bit kernel
arm_64bit=1
# have a properly sized image
disable_overscan=1
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Enable DRM VC4 V3D (graphics) driver
dtoverlay=vc4-kms-v3d
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I did a Pi 5 install back in February on another. That one and this one both are, | Code: | ~ # uname -r
6.6.51-v8-16k+ |
The first few lines of dmesg are; | Code: | [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x414fd0b1]
[ 0.000000] Linux version 6.6.51-v8-16k+ (dom@buildbot) (aarch64-linux-gnu-gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0, GNU ld (GNU Binutils for Ubuntu) 2.38) #1799 SMP PREEMPT Thu Sep 26 16:13:21 BST 2024
[ 0.000000] KASLR enabled
[ 0.000000] random: crng init done
[ 0.000000] Machine model: Raspberry Pi 5 Model B Rev 1.0 |
I don't remember having any issue on either one when creating the correct swap using | Code: | | root #mkswap --pagesize 16384 /dev/sdi2 |
as found in the guide I listed.
Does your dmesg identify the device as a Pi 5? I thought the magic to select the kernel happened in the gpu during boot and it needed the correct swap partition to boot the correct kernel. But, that could be verified by someone other than me.
Best Regards. |
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flysideways
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Joined: 29 Jan 2005
Posts: 477
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| Posted: Tue Oct 08, 2024 1:23 am Post subject: |
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Additionally, I have an M1 (Apple Silicon arm) MacBookPro, and used that with Gentoo in a vm to write to the sd card, and, sneak in a chroot to emerge all of my software after the regular install.
The one in February, I installed all of it natively to an nvme booted from RPIos in the sd card slot. |
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flysideways
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Joined: 29 Jan 2005
Posts: 477
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| Posted: Tue Oct 08, 2024 1:53 am Post subject: |
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I think you can just use swapoff, and then try the | Code: | | root #mkswap --pagesize 16384 /dev/xxx |
command on your swap partition. After that then swapon and reboot. |
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thegrind
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Joined: 22 Sep 2024
Posts: 8
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| Posted: Tue Oct 08, 2024 5:08 am Post subject: |
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Thanks for the help.
I went to another computer (x86_64) and put the microSD card in the USB adapter and typed mkswap --pagesize 16384 /dev/sdc2. Do i have to do this on an arm64 computer? I originally did the install from my x86-64 computer.
I then put it my Rpi and it gives me a pagesize mismatch error for swap and the swap doesn't mount. I also get an error of unable to find swap-space signature in dmesg.
I take the microSD back out and do a mkswap /dev/sdc2 and it makes 4K page size. This mounts without issue and shows it as being mount to the point in my fstab. |
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flysideways
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Joined: 29 Jan 2005
Posts: 477
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| Posted: Tue Oct 08, 2024 6:27 am Post subject: |
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This is from the Pi documentation. https://www.raspberrypi.com/documentation/computers/config_txt.html#kernel
| Quote: |
kernel
kernel is the alternative filename on the boot partition for loading the kernel. The default value on the Raspberry Pi 1, Zero and Zero W, and Raspberry Pi Compute Module 1 is kernel.img. The default value on the Raspberry Pi 2, 3, 3+ and Zero 2 W, and Raspberry Pi Compute Modules 3 and 3+ is kernel7.img. The default value on the Raspberry Pi 4 and 400, and Raspberry Pi Compute Module 4 is kernel8.img, or kernel7l.img if arm_64bit is set to 0.
The Raspberry Pi 5 firmware defaults to loading kernel_2712.img because this image contains optimisations specific to Raspberry Pi 5 (e.g. 16K page-size). If this file is not present, then the common 64-bit kernel (kernel8.img) will be loaded instead.
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Notice that it wants to load the kernel_2712.img file.
This is what I have in /boot after following the guide I listed.
| Code: | /boot # ls
bcm2708-rpi-b.dtb bcm2710-rpi-3-b.dtb bcm2711-rpi-cm4s.dtb config.txt fixup_x.dat start4db.elf
bcm2708-rpi-b-plus.dtb bcm2710-rpi-3-b-plus.dtb bcm2712d0-rpi-5-b.dtb COPYING.linux kernel_2712.img start4.elf
bcm2708-rpi-b-rev1.dtb bcm2710-rpi-cm3.dtb bcm2712-rpi-5-b.dtb fixup4cd.dat kernel7.img start4x.elf
bcm2708-rpi-cm.dtb bcm2710-rpi-zero-2.dtb bcm2712-rpi-cm5-cm4io.dtb fixup4.dat kernel7l.img start_cd.elf
bcm2708-rpi-zero.dtb bcm2710-rpi-zero-2-w.dtb bcm2712-rpi-cm5-cm5io.dtb fixup4db.dat kernel8.img start_db.elf
bcm2708-rpi-zero-w.dtb bcm2711-rpi-400.dtb bcm2712-rpi-cm5l-cm4io.dtb fixup4x.dat kernel.img start.elf
bcm2709-rpi-2-b.dtb bcm2711-rpi-4-b.dtb bcm2712-rpi-cm5l-cm5io.dtb fixup_cd.dat LICENCE.broadcom start_x.elf
bcm2709-rpi-cm2.dtb bcm2711-rpi-cm4.dtb bootcode.bin fixup.dat overlays
bcm2710-rpi-2-b.dtb bcm2711-rpi-cm4-io.dtb cmdline.txt fixup_db.dat start4cd.el |
kernel_2712.img does exist in my /boot, is it in yours?
Also, does dmesg show the "Machine model: Raspberry Pi 5 Model B Rev 1.0" entry found in mine? |
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flysideways
Guru
Joined: 29 Jan 2005
Posts: 477
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| Posted: Tue Oct 08, 2024 6:55 am Post subject: |
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From the Pi documentation I cited it seems that adding | Code: | | kernel=kernel_2712.img |
to config.txt would be the way to force that kernel.
Finally, for now, do you have an sd card with RPIos on it, and does it boot into the expected kernel? |
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pingtoo
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Joined: 10 Sep 2021
Posts: 1155
Location: Richmond Hill, Canada
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| Posted: Tue Oct 08, 2024 12:46 pm Post subject: |
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| thegrind wrote: | | https://wiki.gentoo.org/wiki/How_to_install_Gentoo_on_Raspberry_Pi_5 |
In the wiki, it talk about building kernel in two different way. The wiki focus on using pre-build kernel. But it is unclear which way you do your kernel. So please share how you choose kernel?
Your posted config.txt show no reference to kernel image file. So is the posted config.txt everything or you only posted part of it?
What is in /boot and /boot/firmware?
Also which kernel source you use? |
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thegrind
n00b
Joined: 22 Sep 2024
Posts: 8
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| Posted: Tue Oct 08, 2024 2:11 pm Post subject: |
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I am using the prebuilt as I didn't emerge my own kernel.
I looked in my /boot directory and I was missing the kernel_2712.img as I had the kernel8.img only. Also, the wiki didn't mention anything about moving the kernel_2712.img to the /boot directory.
Fortunately I kept the git clone directories and I still had the kernel_2712.img in the directory. I moved this to the boot and I had to make the swap proper pagesize and I rebooted and did a uname -r and now I have the 16K kernel loading. Thanks for the help. |
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Gentoo on ARM
