Arm-dev

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686 discussions

Tracking Down "Illegal instruction" Sources
by Gordan Bobic 17 Jul '19

17 Jul '19

I'm trying to track down the executables/libraries that are behind the "Illegal instruction" errors I am seeing on my Tegra 2 devices. It seems a given that this is due to some packages from the GL stack (Mesa, libglvnd, etc.) having been build with assumptions of NEON always being present, but I'm trying to figure out a way to determine this definitively. I have tried the approach along the lines of: objdump -Ds $file | grep -E 'vadd\.|vmul\.' since vadd and vmul are both NEON assembly instructions, but this seems to flag up nearly everything, most of which is in fact working (e.g. Firefox 52.x). So either my approach is wrong or there are many binaries that do some kind of runtime detection and selectively use NEON if supported by the hardware. The reason i am looking into this is because gdm doesn't work without working GL (even software mesa GL). It works on my Chromebook without hardware accelerated drivers, but doesn't work on my Tegra laptop without accelerated drivers. On the Chromebook (Exynos) glxgears runs (albeit slowly), but on Tegra, it crashes with "Illegal instruction". I tried rebuilding libglvnd and mesa on the local machine in a hope that NEON capability is auto-detected but that doesn't seem to have made any difference. Any advice/suggestions/insights gratefully received.

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CentOS and Raspberry Pi 4 (four)
by Winfried de Heiden 10 Jul '19

10 Jul '19

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Mesa and NEON
by Gordan Bobic 02 Jul '19

02 Jul '19

Is mesa built with NEON on armv7hl? I'm finding that various things outright crash with an illegal instruction on Tegra 2, and NEON is the only reason I can think of. If it's built with NEON on armv7hl, it really shouldn't be since NEON isn't mandatory on ARMv7.

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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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