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| zfort2000 | Hi all | 08:28 |
|---|---|---|
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| zfort2000 | Here's an interesting blog you can read. https://www.zfort.com/blog | 08:34 |
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| paulbarker | teknix: You can build images for the rpi 3 using https://github.com/agherzan/meta-raspberrypi, it's a good BSP layer | 09:38 |
| paulbarker | If you're looking at BeagleBoard boards, you probably want something newer like the BeaglePlay (https://www.beagleboard.org/boards/beagleplay). That's a modern ARM64 SoC | 09:38 |
| paulbarker | You can also learn a lot just targeting the emulated platforms like qemuarm64, qemux86-64 or qemuriscv64 | 09:39 |
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| teknix | paulbarker: thanks for the info. Ultimately my aim is to get experience working on device driver code. | 09:46 |
| paulbarker | teknix: In that case, look for an SoC with good, freely available documentation. BeaglePlay is likely a good choice | 09:49 |
| teknix | thank you | 09:53 |
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| schramm | Hi. I'm trying to do an in-place upgrade of an old Morty system with kernel 3.14, which is missing the statx syscall. Running Kirkstone binaries with the Morty kernel works: statx calls are answered with ENOSYS (Function not implemented) and then fstatat64() is used as a fallback. With Scarthgap I see an syscall_397() and the application is terminated with error 38. Does anybody know what caused this change? I haven't found anything in the changelogs. | 10:15 |
| schramm | coreutils_9.4.bb from Scarthgap also disables statx via EXTRA_OECONF:append:class-native = " ac_cv_func_statx=0". | 10:15 |
| paulbarker | schramm: I think you need to upgrade the kernel! | 10:21 |
| schramm | paulbarker: That's not easily possible. I'm trying to upgrade to whole Morty system, but as Kirkstone is EOL soon, I switched to Scarthgap. And as Kirkstone binaries are still working with the Morty kernel and offer an fallback for statx, there must have been a change between Kirkstone and Scarthgap that caused that behaviour. | 10:24 |
| mcfrisk | schramm: there are minimum kernel version requirements in a few places like glibc | 10:26 |
| paulbarker | schramm: Are you setting `OLDEST_KERNEL`? The default on Scathgap is not to support anything older than 5.15 IIRC | 10:26 |
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| paulbarker | You could try changing that, but there's no guarantees it'll work with something as old as 3.14. I would seriously prioritise updating the kernel, especially if the system is accessible on a network | 10:28 |
| schramm | mcfrisk: Good hint, maybe that fallback mechanism was provided by the glibc from Kirkstone and is no longer present in Scarthgap. I'm trying to figure out if I can manually re-introduce the Kirkstone behaviour in our Scarthgap BSP to make the upgrade work again. | 10:29 |
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| schramm | paulbarker: Our BSP uses kernel 6.12 LTS with Kirkstone and Scarthgap. Our board manufacturer did some upstream commits to make the vanilla kernel support our boards that are not present in older kernels. | 10:31 |
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| paulbarker | schramm: https://git.openembedded.org/openembedded-core/commit/?h=scarthgap&id=feb8e3fb71131a414a2a9271832b4e16860301ea is worth a look. OLDEST_KERNEL changed between kirkstone & scarthgap | 10:47 |
| schramm | paulbarker: Thanks, will look into it. But I guess this is what I'm looking for: https://sourceware.org/pipermail/glibc-cvs/2021q1/072686.html | 10:48 |
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| schramm | I will try rebuild glibc with __ASSUME_STATX undefined and see if that does the trick. | 10:50 |
| kanavin | schramm, I think OLDEST_KERNEL is the correct way to configure glibc | 10:50 |
| paulbarker | schramm: OLDEST_KERNEL influences how those assumptions are set in glibc | 10:50 |
| kanavin | but seriously, toss that kernel in the bin, you're entirely on your own trying to make it work | 10:50 |
| paulbarker | ^^ +1 | 10:51 |
| kanavin | what is the board that you need to support? | 10:51 |
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| schramm | kanavin: Thanks, will look into OLDEST_KERNEL. And maybe I did not make myself clear enough: the goal is to update the kernel, i.e. to use Scarthgap with 6.12 and cleanly replace Morty. But the devices do not yet support USB boot and the SD card slot is not reachable without disassembling the whole machine. Hence I'm copying a minimal Scarthgap to RAM, pivot_root into it and then I can flash the device's NAND in-place. So I just need the Morty kernel to | 11:31 |
| schramm | execute the upgrade and I don't want to hassle with another seperate kernel update. | 11:31 |
| schramm | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8458002b765c2768490bde9cb8f7665d2ffcf102 | 11:31 |
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| schramm | statx() was introduced in kernel 4.11. Morty: OLDEST_KERNEL = "3.2.0". Kirkstone: OLDEST_KERNEL = "3.2.0". Scarthgap: OLDEST_KERNEL = "5.15". So that seems to be the culprit. Thanks a lot guys! :) | 11:56 |
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| kanavin | schramm, yes, paulbarker have you the link to the commit where I made that change :) | 12:27 |
| kanavin | *gave | 12:27 |
| schramm | kanavin: I noticed it, but I did not want to write "you are the culprit" though. ;) I'm trying to only rebuild the minimal rootfs image that is used for the pivot_root with OLDEST_KERNEL="3.2.0" and to use OLDEST_KERNEL="5.15" for the final image that is then flashed to benefit from the new features and to increase the chance that it will still build. | 12:31 |
| kanavin | can't you flash offline? | 12:33 |
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| schramm | The customers will have to do it and I'm trying to make it as fool-proof as possible. Booting from SD card or USB is currently not possible and I already invested much time to make this work. So I hope to find a way to also make the current process work with Scarthgap again. | 12:37 |
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