June 2019 - Arm-dev - lists.centos.org

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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centos 7 64 bit on raspberry Pi 3
by R 23 Sep '20

23 Sep '20

Hello, I was wondering if there is a procedure for installing Centos 7 on the Raspberry Pi 3 B+ while installing Centos 7.5 on armhfp is very clear and documented given that a raw root image is provided and you just "dd" it on the memory card, it is not clear to me how to do it with aarch64. A ISO image is provided but how to install it on the raspberry ? thank you Rick

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epel-release
by Robert Moskowitz 30 Jun '20

30 Jun '20

Ok, I see this epel-release in the epel1 repo that I installed via the wiki. So I decide to install it, and it created an epel.repo.rpmnew file. I swicth around the files and try a 'yum update' and get: epel/armhfp/metalink | 47 kB 00:00 Could not parse metalink https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=armhfp error was No repomd file One of the configured repositories failed (Unknown), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: .... File /var/cache/yum/armhfp/7/epel/metalink.xml does not exist So I put everything back.

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bluetooth on CentOS Linux release 7.6.1810
by R C 31 May '20

31 May '20

Hello, I am going to use a raspberry PI for browsing on a TV, so I want to connect with a wireless keyboard, bluetooth. It looks like bluetooth is "not running"; [rocr@centos-rpi3 ~]$ systemctl status bluetooth.service ● bluetooth.service - Bluetooth service Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled) Active: inactive (dead) Docs: man:bluetoothd(8) I don't have any bluetooth devices connected yet. but the service should be up, right? Is there a write-up, guide, to get bluetooth configured? thanks, Ron

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Re: [Arm-dev] Add Marvell Armada7k8k NIC (mvpp2) support patches
by Marcin Wojtas 26 May '20

26 May '20

Hi Jim, It's been a while, since I sent the patch. Any objections about merging? Is v4.11 kernel still a valid baseline or for the next releases or we should use v4.14? When is that transition and next release supposed to happen? Best regards, Marcinsob., 23 cze 2018 o 08:18 Marcin Wojtas <mw(a)semihalf.com> napisał(a): > > Hi, > > I'm sending a patch that is applicable on top of the kernel > sig-altarch7-aarch64 branch. It enables ACPI support for the Marvell > Armada7k8k NIC - this required backporting very big amount of patches > (all merged upstream), hence I decided to attach the single commit, > instead of issueing 'git send-email' of it. > > Despite many attempts I wasn't able to build entire rpm package with > the mock build utility, however I managed to test the clean kernel > v4.11 with applied all patches and built with updated .config. Please > let know if this patch is sufficient and can be merged. > > Thanks, > Marcin

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Re: [Arm-dev] Xorg Segfault, Firefox Illegal Instruction
by Gordan Bobic 29 Jun '19

29 Jun '19

Interesting. I don't see any info on how to disable NEON, though, only an insinuation that there is a way. On Sat, Jun 29, 2019 at 3:50 PM Gordan Bobic <gordan.bobic(a)gmail.com> wrote: > Interesting, but I don't see any info on how to disable NEON use in > there... > > On Sat, Jun 29, 2019 at 2:45 PM Pablo Sebastián Greco < > pablo(a)fliagreco.com.ar> wrote: > >> >> El 28/6/19 a las 12:54, Gordan Bobic escribió: >> >> On Fri, Jun 28, 2019 at 4:42 PM Pablo Sebastián Greco < >> pablo(a)fliagreco.com.ar> wrote: >> >>> >>> El 28/6/19 a las 10:38, Gordan Bobic escribió: >>> >>> I took the CentOS 7 arm32 image for a spin today and ran into some >>> issues. Is there a bug tracker that anyone pays attention to for >>> semi-supported altarch like armv7? >>> >>> I'm using a Tegra 2 based system >>> >>> Issues: >>> 1) Xorg segfaults while probing platform, according to the logs. >>> Only solution I have found is to create a new .repo file for CentOS 7.5 >>> and downgrade xorg-x11-server-Xorg to 1.19.x from CentOS 7.5. >>> >>> I thought I had pushed the fix to the fasttrack repo, but I didn't. >>> Here's a fixed version from my tests >>> https://people.centos.org/pgreco/xorg-x11-server/20190507012356/ >>> Anyway, it is already reported in RH, and it seems to be fixed in 7.7 >>> beta and 8.0 >>> >> >> >> Great, thanks. >> Since I posted that I discovered I actually had to roll all the way back >> to Xorg 1.14 from Fedora 20 because the last binary Tegra 2 Nvidia driver >> (I'm on an AC100) is ABI v14. I'm currently wrestling a monstrosity of a >> Tegra 2 GPU kernel driver patch against a mainline kernel that will >> probably take most of a day to compile... >> >> >>> >>> 2) Firefox 60.x dies on startup with an Illegal Instruction error. >>> FF 52.7 from CentOS 7.5 works. >>> >>> That one I haven't seen, I'll try to replicate it in one of my devices >>> and get back to you >>> >> >> Thanks. most appreciated. >> >> Gordan, I don't have good news..., firefox is working normally in my >> rpi3b+, my theory is that you're hitting this >> https://bugzilla.mozilla.org/show_bug.cgi?id=1289569 >> >> Gordan >> >> _______________________________________________ >> Arm-dev mailing listArm-dev@centos.orghttps://lists.centos.org/mailman/listinfo/arm-dev >> >> Pablo. >> _______________________________________________ >> Arm-dev mailing list >> Arm-dev(a)centos.org >> https://lists.centos.org/mailman/listinfo/arm-dev >> >

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Chromium for armv7hl?
by Gordan Bobic 29 Jun '19

29 Jun '19

Is there a rpm-ed Chromium package? Has anyone managed to get this to build on armv7hl recently?

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Xorg Segfault, Firefox Illegal Instruction
by Gordan Bobic 29 Jun '19

29 Jun '19

I took the CentOS 7 arm32 image for a spin today and ran into some issues. Is there a bug tracker that anyone pays attention to for semi-supported altarch like armv7? I'm using a Tegra 2 based system Issues: 1) Xorg segfaults while probing platform, according to the logs. Only solution I have found is to create a new .repo file for CentOS 7.5 and downgrade xorg-x11-server-Xorg to 1.19.x from CentOS 7.5. 2) Firefox 60.x dies on startup with an Illegal Instruction error. FF 52.7 from CentOS 7.5 works. Is anyone working on either of these? I think the former affects more than just ARM. Gordan

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Old dtb directory not deleted
by Robert Moskowitz 23 Jun '19

23 Jun '19

I just did an update that installed a new kernel. All the old kernel files were deleted from /boot except for the dtb directory. In this case, dtb-4.14.82-201.el7.armv7hl Here is a list of the /boot directory. What is needed to make sure everything old is removed from boot? $ ls -ls /boot/ total 292730 2 -rw-r--r--. 1 root root 2 Nov 3 2018 boot.scr 204 -rw-r--r--. 1 root root 206130 Jun 17 20:53 config-4.14.127-200.el7.armv7hl 204 -rw-r--r--. 1 root root 206070 Jan 6 09:38 config-4.14.91-201.el7.armv7hl 27 drwxr-xr-x. 2 root root 25600 Jun 23 09:19 dtb-4.14.127-200.el7.armv7hl 27 drwxr-xr-x. 3 root root 25600 Jun 23 09:23 dtb-4.14.82-201.el7.armv7hl 27 drwxr-xr-x. 2 root root 25600 Jan 11 14:44 dtb-4.14.91-201.el7.armv7hl 2 drwxr-xr-x. 2 root root 1024 Jun 23 09:29 extlinux 2 drwxr-xr-x. 2 root root 1024 Dec 5 2016 grub 34835 -rw-------. 1 root root 35529320 Dec 5 2016 initramfs-0-rescue-e3a7bc0f423e4311a45e7d423cb8743d.img 42323 -rw-------. 1 root root 43166836 Jun 23 09:29 initramfs-4.14.127-200.el7.armv7hl.img 42243 -rw-------. 1 root root 43085027 Jan 11 14:52 initramfs-4.14.91-201.el7.armv7hl.img 597 -rw-r--r--. 1 root root 605252 Dec 5 2016 initrd-plymouth.img 2 -rw-------. 1 root root 49 Jun 23 09:29 klist.txt 13 drwx------. 2 root root 12288 Dec 5 2016 lost+found 3374 -rw-------. 1 root root 3438384 Jun 17 20:53 System.map-4.14.127-200.el7.armv7hl 3370 -rw-------. 1 root root 3434223 Jan 6 09:38 System.map-4.14.91-201.el7.armv7hl 6537 -rw-r--r--. 1 root root 6664768 Jun 23 09:29 uImage 6537 -rw-r--r--. 1 root root 6664768 Jun 23 09:29 uImage-4.14.127-200.el7.armv7hl 6521 -rw-r--r--. 1 root root 6648384 Jan 11 14:52 uImage-4.14.91-201.el7.armv7hl 42323 -rw-r--r--. 1 root root 43166900 Jun 23 09:29 uInitrd 42323 -rw-r--r--. 1 root root 43166900 Jun 23 09:29 uInitrd-4.14.127-200.el7.armv7hl 42243 -rw-r--r--. 1 root root 43085091 Jan 11 14:52 uInitrd-4.14.91-201.el7.armv7hl 5936 -rwxr-xr-x. 1 root root 6051744 Dec 5 2016 vmlinuz-0-rescue-e3a7bc0f423e4311a45e7d423cb8743d 6537 -rwxr-xr-x. 1 root root 6664704 Jun 17 20:53 vmlinuz-4.14.127-200.el7.armv7hl 6521 -rwxr-xr-x. 1 root root 6648320 Jan 6 09:38 vmlinuz-4.14.91-201.el7.armv7hl

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Also these files in boot
by Robert Moskowitz 23 Jun '19

23 Jun '19

# ls -ls /boot/.vmlinuz* 2 -rw-r--r--. 1 root root 169 Jun 17 20:45 /boot/.vmlinuz.hmac-4.14.127-200.el7.armv7hl 2 -rw-r--r--. 1 root root 168 Jun 28 2018 /boot/.vmlinuz.hmac-4.14.52-201.el7.armv7hl 2 -rw-r--r--. 1 root root 168 Aug 9 2018 /boot/.vmlinuz.hmac-4.14.61-201.el7.armv7hl 2 -rw-r--r--. 1 root root 168 Aug 20 2018 /boot/.vmlinuz.hmac-4.14.65-201.el7.armv7hl 2 -rw-r--r--. 1 root root 168 Sep 20 2018 /boot/.vmlinuz.hmac-4.14.71-201.el7.armv7hl 2 -rw-r--r--. 1 root root 168 Nov 25 2018 /boot/.vmlinuz.hmac-4.14.82-201.el7.armv7hl 2 -rw-r--r--. 1 root root 168 Jan 6 09:30 /boot/.vmlinuz.hmac-4.14.91-201.el7.armv7hl I did a updatedb, then a 'locate 4.14.82' which pointed me to the 4.14.82 hmac file, then I checked to see other hmac files were there...

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Fwd: Old dtb directory not deleted
by Gordan Bobic 23 Jun '19

23 Jun '19

Doesn't the /boot/dtb-%{version}-%{release} directory come from the kernel rpm? If so, it's the kernel rpm cleanup that should remove it. Or at least that's what happens with my own kernel rpms.

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Stateless CentOS on ARM question
by Seth Meyer 21 Jun '19

21 Jun '19

Hello, A colleague and I are trying to get an ARM server to boot stateless (i.e. diskless). Has anyone had any success with this? Our primary source of inspiration is the documentation for the Pegasus cluster: http://web.mst.edu/~vojtat/pegasus/administration.htm Basically, the idea is to have the kernel load a custom initramfs that decompresses a file system image onto a tmpfs at boot time (along with some other setup), then execute a `switch_root` to said tmpfs. We have succeeded in getting an x86_64 machine to boot (mostly) diskless, using the disk only for the boot process by creating a GRUB entry. However, when we try this with my ARM (ThunderX) server, the kernel panics during the boot process because it cannot find init. We have also tried passing `init=/init` as a kernel parameter with no luck. The error message is Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/init.txt for guidance. We looked at the referenced documentation and it's not a ton of help for my specific case. The initramfs environment is based on Busybox, which we compiled on a ThunderX machine (the same one we are trying to boot from, in fact). We have considered compiling my own kernel with the initramfs built in, but we are trying to avoid doing that. Further, we have tried with the 3.10 and 4.4 kernels on x86, and with 4.5 and 4.14 kernels on aarch64. Does anyone have any guidance? Also, please let us know if you need more information. Best regards, Marc Patton and Seth Meyer ARC-TS - https://arc-ts.umich.edu/ University of Michigan

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Updated howtos
by Robert Moskowitz 20 Jun '19

20 Jun '19

My Howto guides for CentOS on Cubieboards and Odroid have been updated! You can get to them via: http://www.htt-consult.com/arm.html I recently lost a drive and had to quickly rebuild a system (fortunately not a critical use one). It went reasonably well using my own instructions, but just was challenging to do all the select and copy work. So I learned some CSS and Javascript and made all the text areas directly selectable/copyable. Note the mailserver is still a work in progress. Maybe after this distraction I will get back to it.

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ARM aarch64 rootfs questions
by Christophe Polyte 20 Jun '19

20 Jun '19

Hello, I've some small arm (rock64) boards for which I want to deploy CentOS. They are based on uboot. I've a custom kernel, then I deploy the (old) provided rootfs (CentOS-7-aarch64-rootfs-7.4.1708.tar.xz). Everything is working properly, but now I want to have an up to date image (ideally with less components to remove after deployment) to flash my other devices. I've two questions: * Why an up to date image 1810 is not provided ? * What would be the proper and cleaner way to do it myself (for example with deploying a clean true minimal system on a qemu aarc64 VM), maybe a simple tar, but what arguments should I care to be as clean a possible regarding permissions and SELinux context ? Thanks in advance, Best Regards, Christophe

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Arm-dev June 2019