Arm-dev December 2020

arm-dev@lists.centos.org

8 participants
11 discussions

AArch64 Pi4 and CentOS 8
by Brent Kolasinski 31 Oct '25

31 Oct '25

Hi everyone, I've been looking into things I can do to help with getting CentOS 8 AArch64 to run on the Pi4. It appears that the upstream kernel now has the proper stuff merged in to support the NIC and eMMC controller. So far 2 approaches are being made: The U-Boot mechanism (looks like this is what Ubuntu 20.04 is doing) and the SBBR (ACPI + UEFI) way. It looks like a few folks may be loading the SBBR firmware with luck on the standard CentOS 8 aarch64 image. Could one potentially recompile the SRPM for kernel 5.6 from elrepo and drop it in? I found the CentOS8 pi4 aarch64 userland image here: https://people.centos.org/pgreco. Has anyone tried getting the SBBR firmware to load the stock aarch64 CentOS 8 image without support for the eMMC / NIC, to basically bootstrap and compile the SRPM for the 5.6 kernel? And finally does anyone know if CentOS will be backporting the Pi4 changes to 4.18, or will they be releasing a custom kernel? Could I help out with that?

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rng-tools missing and /dev/hwrng without driver
by SW＠EU 31 Oct '25

31 Oct '25

Hi, today I will report a problem that is released to ipa-server. This server contains a certificate authority and such service need many entropy. The default on CentOS 7 on a Banana PI is not enough, i.e. $(cat /proc/sys/kernel/random/entropy_avail) is less than 1000. I have solved this in meantime by installing and enabling of haveged from the EPEL repository. Normally it would be done by installing the rng-tools. But there are two problems: 1. The rng-tools was not in the repositories, so I have downloaded rng-tools-5-8.fc24.armv7hl.rpm because this are the same version which is included in CentOS 7.3 for x86_64. 2. This rng-tools are usable but the daemon starts and stops immediately with the following error message: # rngd -v /dev/hwrng: No such device /dev/tpm0: No such file or directory No entropy sources found, exiting This is not the problem of this binary it is a problem of the Kernel. /dev/hwrng exists and if I remove it then it reappears after reboot, but # ls -l /dev/hwrng crw-------. 1 root root 10, 183 1. Jan 1970 /dev/hwrng # udevadm info -a -n /dev/hwrng Udevadm info starts with the device specified by the devpath and then walks up the chain of parent devices. It prints for every device found, all possible attributes in the udev rules key format. A rule to match, can be composed by the attributes of the device and the attributes from one single parent device. looking at device '/devices/virtual/misc/hw_random': KERNEL=="hw_random" SUBSYSTEM=="misc" DRIVER=="" ATTR{rng_current}=="none" ATTR{rng_available}=="" there is no driver for this device. I have searched and found this link http://forum.lemaker.org/thread-23618-1-1.html which includes a link to the full story. If I read all right then on bananian /dev/hwrng appears only if the adapted or a more actual sun4i-ss.ko module is loaded (there is written: "module author has indicated this will be going into the mainline kernel shortly“). This module is also loaded on a Banana PI with current CentOS 7. So does the kernel of CentOS 7.3 for ARM32 include this patch and if yes why it does not work or otherwise why this device appears but has no driver? TIA, Silvio Sent with [ProtonMail](https://protonmail.com) Secure Email.

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EPEL repo not available?
by Boyd Ako 31 Oct '25

31 Oct '25

Can anybody verify that the EPEL repo for ARMHFP isn’t available? I keep getting an error saying the REPOMD file isn’t there when running yum. It works if I use —disablerepo=epel\* when using yum. But, there might be some stuff in the EPEL that I’m looking for. Running it on a Raspberry Pi 3 and trying to get Nagios installed for home use. Domo, Boyd H. Ako boyd.hanalei.ako(a)gmail.com (424) 244-9653 https://www.boydhanaleiako.me “Coming together is a beginning. Keeping together is progress. Working together is success.” -Henry Ford PGP/GPG Public Key: https://sks-keyservers.net/pks/lookup?op=get&search=0xC58073B21618F134

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Gigabyte MP30-AR0
by Gordan Bobic 31 Oct '25

31 Oct '25

Hi, I am toying with the idea of getting a Gigabyte MP30-AR0 board (despite the insanely exorbitant price tag). Has anyone got the aarch64 CentOS working on one of those? Any special instructions? Also, if I get the ISO, is it bootable on aarch64? Does the installer work? Or does the image have to be used like on 32-bit ARM? Thanks. Gordan

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Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model (32bit)
by mark 17 Dec '20

17 Dec '20

-----Original message----- > From: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar> > Sent: Thursday, December 17, 2020 9:39 PM > To: mark <mark(a)havak.nl>; Conversations around CentOS on ARM hardware <arm-dev(a)centos.org> > Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model (32bit) > > > On 17/12/20 14:09, mark wrote: > > -----Original message----- > >> From: mark <mark(a)havak.nl> > >> Sent: Monday, December 14, 2020 6:15 PM > >> To: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar>; Conversations around > CentOS on ARM hardware <arm-dev(a)centos.org> > >> Subject: RE: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > (32bit) > >> > >> > >> > >> -----Original message----- > >>> From: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar> > >>> Sent: Monday, December 14, 2020 6:00 PM > >>> To: Conversations around CentOS on ARM hardware <arm-dev(a)centos.org>; > mark > >> <mark(a)havak.nl> > >>> Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > (32bit) > >>> > >>> > >>> On 14/12/20 13:43, mark wrote: > >>>> -----Original Message----- > >>>> From: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar> > >>>> Sent: maandag 14 december 2020 17:20 > >>>> To: Conversations around CentOS on ARM hardware <arm-dev(a)centos.org>; > >> mark > >>> <mark(a)havak.nl> > >>>> Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > >> (32bit) > >>>> > >>>> On 14/12/20 11:42, mark wrote: > >>>>> Being aware using zram-swap is not a default feature on the CentOS > >>>>> Userland for armv7hl, Still want to share the problem I ran in to. > >>>>> > >>>>> I turns out the arm 32bit kernel with large memory support OOPS if zram-swap > >>> is deployed if the system has more than 4GB ram. > >>>> I'm a heavy user of zram-swap, even not being default, but I have only > >> used > >>> with devices that have 2G max, this is interesting. Does it still happen > >> if > >>> you limit the size? > >>>> Did not test limiting the ram to 4GB myself jet, it does according to > >> : > >>>> https://github.com/raspberrypi/linux/issues/3839#issuecomment-723027652 > >>> I meant limiting the size of the zram-swap > >> No the size of the swap does not seem matter: I tried 512, 1024 and 4096MB > >> > >> On a RPI4 4GB model it works just fine, > >> on a 8GB model I get a "Internal error: Oops: 207" > >> > >> BTW running a fresh homebrew image of CentOS 7.9.2009 without a swap-partition > >> and kernel: > >> 5.4.72-v7l.1.el7 #1 SMP Wed Oct 21 17:20:56 UTC 2020 armv7l armv7l armv7l > >> GNU/Linux > >> > >> > >>>> > >>>>> This issue seems to be addressed (verry recently) in kernel 5.4.81 (1) > >>>>> > >>>>> As mentioned this is verry recently, version 5.4.81 is just 12 day's > >> old.. > >>>>> However if there is a testbuild of this rpi2-kernel4: I'm eager to test > >>> it  > > Just a heads-up, > > > > I could not figure out how to make a test build of a kernel => 5.4.81 based > on the current raspberrypi2-kernel4-5.4.72 kernel. > > Not knowledgeable enough to update the rpi-5.4.x.patch... My Bad > > > > However was able to rebuild the current kernel with the patch mentioned > in the commit (1); > > needed to include an other, quite harmless looking, patch in order to get > it applied clean > > That's even better actually, because we can confirm that it actually > that patch that fixes it, thanks!!! > > Just curious, how long did it take to rebuild the kernel? About 01:45; (mock) state.log building on an odroid hc1: 2020-12-17 15:46:56,190 - Mock Version: 2.7 2020-12-17 15:46:58,637 - Start: yum update 2020-12-17 15:47:11,414 - Finish: yum update 2020-12-17 15:47:11,458 - Finish: chroot init 2020-12-17 15:47:11,470 - Start: build phase for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 15:47:11,488 - Start: build setup for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 15:48:41,143 - Finish: build setup for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 15:48:41,147 - Start: Outputting list of installed packages 2020-12-17 15:48:41,842 - Finish: Outputting list of installed packages 2020-12-17 15:48:41,843 - Start: rpmbuild raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 17:28:49,731 - Finish: rpmbuild raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 17:28:51,856 - Finish: build phase for raspberrypi2-5.4.72-v7.1.1.ns7.src.rpm 2020-12-17 17:28:51,884 - Start: clean chroot 2020-12-17 17:30:32,678 - Finish: clean chroot 2020-12-17 17:30:32,683 - Finish: run probably going to move to a (faster) platform in the future; it is hard to just say goodbye to a device that served you well :) > > > Long story short, zram-swap works on my RPI4 8G model: > > > > # swapon --show > > NAME TYPE SIZE USED PRIO > > /dev/zram0 partition 3.7G 0B -2 > > > > # uname -a > > Linux localhost 5.4.72-v7l.1.1.el7 #1 SMP Thu Dec 17 16:13:03 CET 2020 armv7l > armv7l armv7l GNU/Linux > > > > # free -m > > total used free shared buff/cache available > > Mem: 7876 94 7469 16 312 > 7691 > > Swap: 3755 0 3755 > > > > > > In my (probably short lived) git repo the changes I made: > > https://github.com/markVnl/Centos-raspberrypi2-kernel/tree/zram-swap-oops > > > > > >>>> There's no test build yet, I'm still adjusting to what happened last > >>>> week, but hopefully we'll have a new kernel soon > >>>>> 1) https://github.com/raspberrypi/linux/commit/1bef5f25a69234613b92a0e2456870f… > >>>>> > >>>>> > >>>> Pablo. > >>>> > >>>> _______________________________________________ > >>>> Arm-dev mailing list > >>>> Arm-dev(a)centos.org > >>>> https://lists.centos.org/mailman/listinfo/arm-dev > Pablo. >

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Supported Hardware for CentOS8
by Andreas Reschke 17 Dec '20

17 Dec '20

Hello together, I've running a SOHO mailserver (postfix, dovecot, amavis, spamassassin, apache, nextcloud, mariadb) with fedora on a Odroid-XU4 for a long time. Since limmited RAM (2GB) OOM kills amavis 2/3 a day. Now I'm thing to replace Odroid-HC1 with a SOC with more RAM Is there any Hardware (SOC, no expensive Serverbords) that runs with CentOS8 and/or Fedora? OS : CentOS8 and/or Fedora aarch64 CPU: min 4 RAM: min 4 GB Storage: eMMC with SSD, USB3 Thoose boards on https://fedoraproject.org/wiki/Architectures/ARM are all armv7hl (=32Bit) and on https://wiki.centos.org/SpecialInterestGroup/AltArch/AArch64 are all expensive Serverbords. Greetings Andreas

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Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model (32bit)
by mark 17 Dec '20

17 Dec '20

-----Original message----- > From: mark <mark(a)havak.nl> > Sent: Monday, December 14, 2020 6:15 PM > To: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar>; Conversations around CentOS on ARM hardware <arm-dev(a)centos.org> > Subject: RE: [Arm-dev] unable to configure zram-swap on RPI 4 8G model (32bit) > > > > -----Original message----- > > From: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar> > > Sent: Monday, December 14, 2020 6:00 PM > > To: Conversations around CentOS on ARM hardware <arm-dev(a)centos.org>; mark > <mark(a)havak.nl> > > Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model (32bit) > > > > > > On 14/12/20 13:43, mark wrote: > > > > > > -----Original Message----- > > > From: Pablo Sebastián Greco <pablo(a)fliagreco.com.ar> > > > Sent: maandag 14 december 2020 17:20 > > > To: Conversations around CentOS on ARM hardware <arm-dev(a)centos.org>; > mark > > <mark(a)havak.nl> > > > Subject: Re: [Arm-dev] unable to configure zram-swap on RPI 4 8G model > (32bit) > > > > > > > > > On 14/12/20 11:42, mark wrote: > > >> Being aware using zram-swap is not a default feature on the CentOS > > >> Userland for armv7hl, Still want to share the problem I ran in to. > > >> > > >> I turns out the arm 32bit kernel with large memory support OOPS if zram-swap > > is deployed if the system has more than 4GB ram. > > > I'm a heavy user of zram-swap, even not being default, but I have only > used > > with devices that have 2G max, this is interesting. Does it still happen > if > > you limit the size? > > > > > > Did not test limiting the ram to 4GB myself jet, it does according to > : > > > https://github.com/raspberrypi/linux/issues/3839#issuecomment-723027652 > > I meant limiting the size of the zram-swap > > No the size of the swap does not seem matter: I tried 512, 1024 and 4096MB > > On a RPI4 4GB model it works just fine, > on a 8GB model I get a "Internal error: Oops: 207" > > BTW running a fresh homebrew image of CentOS 7.9.2009 without a swap-partition > and kernel: > 5.4.72-v7l.1.el7 #1 SMP Wed Oct 21 17:20:56 UTC 2020 armv7l armv7l armv7l > GNU/Linux > > > > > > > > > > >> This issue seems to be addressed (verry recently) in kernel 5.4.81 (1) > > >> > > >> As mentioned this is verry recently, version 5.4.81 is just 12 day's > old.. > > >> However if there is a testbuild of this rpi2-kernel4: I'm eager to test > > it  Just a heads-up, I could not figure out how to make a test build of a kernel => 5.4.81 based on the current raspberrypi2-kernel4-5.4.72 kernel. Not knowledgeable enough to update the rpi-5.4.x.patch... My Bad However was able to rebuild the current kernel with the patch mentioned in the commit (1); needed to include an other, quite harmless looking, patch in order to get it applied clean Long story short, zram-swap works on my RPI4 8G model: # swapon --show NAME TYPE SIZE USED PRIO /dev/zram0 partition 3.7G 0B -2 # uname -a Linux localhost 5.4.72-v7l.1.1.el7 #1 SMP Thu Dec 17 16:13:03 CET 2020 armv7l armv7l armv7l GNU/Linux # free -m total used free shared buff/cache available Mem: 7876 94 7469 16 312 7691 Swap: 3755 0 3755 In my (probably short lived) git repo the changes I made: https://github.com/markVnl/Centos-raspberrypi2-kernel/tree/zram-swap-oops > > > There's no test build yet, I'm still adjusting to what happened last > > > week, but hopefully we'll have a new kernel soon > > >> 1) https://github.com/raspberrypi/linux/commit/1bef5f25a69234613b92a0e2456870f… > > >> > > >> > > > Pablo. > > > > > > _______________________________________________ > > > Arm-dev mailing list > > > Arm-dev(a)centos.org > > > https://lists.centos.org/mailman/listinfo/arm-dev > >

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(Unofficial) epel for armv7hl offline ?
by mark 12 Dec '20

12 Dec '20

Hello list, today I'v got a : Forbidden You don't have permission to access /repodir/epel-pass-1/ on this server. While accessing https://armv7.dev.centos.org/repodir/epel-pass-1/ Hence it is impossible to make (grateful) use of the unofficial epel for armv7hl rebuild. Any Ideas / status updates on this?

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Re: [Arm-dev] (no subject)
by Pablo Sebastián Greco 08 Dec '20

08 Dec '20

On 7/12/20 17:21, Jascha Gerold wrote: > On December 7, 2020 at 9:28 AM, Pablo Sebastián Greco > <pablo(a)fliagreco.com.ar> wrote: > >> >> On 6/12/20 18:39, Jascha Gerold via Arm-dev wrote: >>> Hi everyone! >>> I just joined the list. Total arm/rpi4 beginner here. Been using >>> Fedora for a year on my personal computer (switched from Apple). Thats >>> my background. My goal is to have my rpi4 run a webserver for my >>> Django projects. I have been experimenting with Raspberry Pi OS, >>> Fedora 33 and Centos 7/8 on the Raspberry. I would like to use a >>> yum/dnf based distribution on the Pi, because I am a bit more familiar >>> with its cli. >>> I believe that the >>> CentOS-Userland-7-armv7hl-RaspberryPI-Minimal-4-2009-sda.raw image >>> would be the way to go. >>> But frankly I am terrified by configuring all the different sources >>> for the latest packages (sqlite3, django 3, and so on) and getting >>> them to interact flawlessly without breaking the system. >>> Fedora does not have a native rpi4 image. They are generic and boot >>> differently that the CentOS one. >>> >>> Can I use the boot partition from >>> CentOS-Userland-7-armv7hl-RaspberryPI-Minimal-4-2009-sda.raw combined >>> with the Fedora Userland? Id have to disable kernel updates I guess >>> and cross compile them myself (done that successfully yesterday). >>> >>> TLDR: >>> My question is: How do I get the native rpi4 centos way to boot >>> combined with fedora userland? >>> >>> Jay >>> >> Hello Jay, welcome! >> Let me see if I can address your questions together. and a bit out of >> order. If your idea is to use Fedora userland, then I'd use fedora >> altogether, they don't have rpi4 specific builds, but they don't need it >> either. Fedora uses always the latest mainline kernel, and it has "good >> enough" support for what you're trying to do (basically headless). If >> you were trying to do something with graphics, it would be a completely >> different story. >> If you decide to use CentOS, I'd not use the armv7hl image (32 bits) and >> go straight to aarch64. There's no official image yet, but I've posted >> one that is working really well >> https://people.centos.org/pgreco/CentOS-Userland-8-stream-aarch64-Raspberry… >> <https://people.centos.org/pgreco/CentOS-Userland-8-stream-aarch64-Raspberry…> >> >> , and this is where I keep the updated kernels >> https://people.centos.org/pgreco/rpi_aarch64_el8/ >> <https://people.centos.org/pgreco/rpi_aarch64_el8/> (along with other >> rpi-specific stuff) >> >> HTH >> Pablo.\ > > Thank you for replying so promptly, Pablo! I actually tried to get > Fedora to run from a USB attached HDD, but my knowledge was not good > enough. I can only get it to boot from sd card. Thats why I love the > way CentOS boots with the rpi4 image: I just have to point root to > sda3 instead of mmcblk0p3 in cmdline.txt (tried to use partuuid, which > works for booting, but then the script rootfs-expand does not find its > expected rootfs). Wrt Fedora boot, if usb works after you boot from the SD card, then I guess I'd check 3 things, rpi-eeprom (needs to be rather new to support booting from usb), rpi-firwmare (rpi-specific files in /boot, also need to be rather new), and maybe, but less likely, driver missing in the initramfs. Wrt cmdline.txt and UUID, I have no idea why that doesn't work, I too change it to /dev/sda3) > So today I tried the centos image you mentioned (8, stream, aarch64). > It works just fine, however the cpu frequency stays at max. With the > centos 7, armhfp image the cpu is allowed to throttle down. Is that a > kernel or config thing? I have only tried compiling armhfp kernels > from the raspberry github. I can try to compile a 64bit one if they > have the correct sources and configs. Anything more than that exceeds > my current abilities. Can you point me in a direction (like where to > look for the cpu frequency issue)? I guess something tuned is doing, or something missing in the config.txt. The kernels are the ones from the rpi foundation's github, but just rebuilt for CentOS with a few different options. > Well thanks again for responding!! > Jay Pablo P.S: try to always do reply to all, so all the answers end up in the mailing list. Thanks

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Re: [Arm-dev] Arm-dev Digest, Vol 76, Issue 1
by Phil Leschina 08 Dec '20

08 Dec '20

I don’t have the answer to your question. Instead I would suggest using podman (similar to docker) to run django, SQLite, etc in containers or pods. Thereby isolating those environments from your base os. But still be able to access by ip/port. An example showing how to accomplish can be found here: https://developers.redhat.com/blog/2019/09/11/develop-with-django-2-and-pyt… Best regards. Phil > On Dec 7, 2020, at 7:00 AM, arm-dev-request(a)centos.org wrote: > > Send Arm-dev mailing list submissions to > arm-dev(a)centos.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.centos.org/mailman/listinfo/arm-dev > or, via email, send a message with subject or body 'help' to > arm-dev-request(a)centos.org > > You can reach the person managing the list at > arm-dev-owner(a)centos.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Arm-dev digest..." > > > Today's Topics: > > 1. (no subject) (Jascha Gerold) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 06 Dec 2020 21:39:57 -0000 > From: Jascha Gerold <jayalt(a)icloud.com> > To: arm-dev(a)centos.org > Subject: [Arm-dev] (no subject) > Message-ID: <3117afd7-b0b6-4dd7-ae17-64329d3de761(a)me.com> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > Hi everyone! > > I just joined the list. Total arm/rpi4 beginner here. Been using Fedora for a year on my personal computer (switched from Apple). Thats my background. My goal is to have my rpi4 run a webserver for my Django projects. I have been experimenting with Raspberry Pi OS, Fedora 33 and Centos 7/8 on the Raspberry. I would like to use a yum/dnf based distribution on the Pi, because I am a bit more familiar with its cli. > I believe that the CentOS-Userland-7-armv7hl-RaspberryPI-Minimal-4-2009-sda.raw image would be the way to go. > > But frankly I am terrified by configuring all the different sources for the latest packages (sqlite3, django 3, and so on) and getting them to interact flawlessly without breaking the system. > > Fedora does not have a native rpi4 image. They are generic and boot differently that the CentOS one. > > > > Can I use the boot partition from CentOS-Userland-7-armv7hl-RaspberryPI-Minimal-4-2009-sda.raw combined with the Fedora Userland? Id have to disable kernel updates I guess and cross compile them myself (done that successfully yesterday). > > > > TLDR: > > My question is: How do I get the native rpi4 centos way to boot combined with fedora userland? > > > > Jay >

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Arm-dev December 2020