#nixos-aarch64 on 2020-10-27

2019-09-27 17:31 gchristensen changed the topic of #nixos-aarch64 to: Get access to the NixOS Community aarch64 build box: https://github.com/nix-community/aarch64-build-box ... todo: https://hydra.nixos.org/jobset/nixpkgs/trunk#tabs-jobs build box status: https://status.nixos.org/grafana/d/5LANB9pZk/per-instance-metrics?orgId=1&refresh=30s&var-instance=147.75.77.190

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03:49 <colemickens> well, I made a less naive attempt at rpi4 mainline 5.10 and now it's on a black screen and no ssh access -_-

03:50 <colemickens> wish me luck

03:51 <samueldr> good luck!

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04:29 <clever> i'm using the latest build from https://hydra.nixos.org/build/129096047

04:29 <clever> and the lack of a configuration.nix is a bit non-user-friendly

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06:06 <samueldr> with mobile-nixos#233 we now have a way to talk to the init!

06:06 <{^_^}> https://github.com/NixOS/mobile-nixos/pull/233 (by samueldr, 10 minutes ago, open): stage-1: Add progress tracking in splash

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09:20 <patagonicus> Wanted to install Hydra to help with failing builds, but now Hydra is failing to build. :D

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20:04 <samueldr> hmmm... now that I have communication with init, for stage-1, I could implement all "hard parts" inside init and just use that communication channel to do stuff

20:04 <samueldr> e.g. the recovery menu will have to handle being able to manually mount an encrypted partition

20:04 <samueldr> and the boot process *already* has to handle that anyway

20:05 <samueldr> similarly, expanding a filesystem to fill a partition

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20:06 <samueldr> that way init could mediate access to those resources, and lock until done

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20:46 <samueldr> hmmmm

20:46 <samueldr> https://www.johannes-bauer.com/linux/luksipc/

20:48 <samueldr> oh

20:48 <samueldr> https://man7.org/linux/man-pages/man8/cryptsetup-reencrypt.8.html

20:49 <samueldr> or more to the point https://manpages.debian.org/unstable/cryptsetup-bin/cryptsetup.8.en.html

20:49 <samueldr> CTRL+F reencrypt

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21:05 <colemickens> what are armstubs for?

21:06 <colemickens> armstub8-gic.bin ?

21:08 <clever> colemickens: the arm cpu begins execution at arm physical 0, and there is a fair amount of setup that has to be done before linux can use the arm core

21:08 <clever> colemickens: the arm stubs get copied to arm physical 0, do that setup, and then jmp to the kernel entry-point

21:08 <clever> and there are default stubs inside the start(4).elf binary, so you usually dont have to touch them

21:09 <colemickens> the rpi4 sd image specifically copies it, I was kind of curious why

21:10 <samueldr> clever: for u-boot it's needed

21:10 <samueldr> at least it was at some point

21:10 <samueldr> haven't verified if it isn't anymore

21:10 <colemickens> (I forget I think I have a PR applied that's not yet merged)

21:10 <samueldr> probably the one introducing u-boot

21:12 <clever> should check if its still needed, since i expect it to have been fixed by now

21:12 <samueldr> clever: could it be a different armstub than the one embedded in the start4.elf?

21:13 <clever> possibly, but where are you getting it from then?

21:13 <samueldr> the raspberry pi foundation

21:13 <clever> id expect them to have embedded it

21:14 <clever> https://github.com/raspberrypi/tools/tree/master/armstubs

21:14 <clever> the source for the stubs is also over here

21:14 <samueldr> I don't

21:14 <samueldr> >> armstub8-32.bin armstub8-32-gic.bin armstub8.bin armstub8-gic.bin armstub8-gic-highperi.bin

21:14 <samueldr> since there seems to be different ones!

21:14 <samueldr> -gic vs. -gic-highperi vs. nothing

21:14 <samueldr> so what I assume happens here is that start4.elf has the non-gic one

21:15 <samueldr> and u-boot wants the -gic one

21:15 <clever> %8-gic.o: %8.S $(CC8) -DGIC=1 -DBCM2711=1 -c $< -o $@

21:15 <clever> %8-gic-highperi.o: %8.S $(CC8) -DGIC=1 -DHIGH_PERI=1 -DBCM2711=1 -c $< -o $@

21:15 <clever> all in the Makefile in the above dir

21:15 <samueldr> yes

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21:15 <samueldr> just as what I described

21:15 <samueldr> >> could it be a different armstub than the one embedded in the start4.elf?

21:15 <samueldr> yes it could

21:17 <clever> the arm stubs are embeded into start(4).elf as plain binary, so you can also just hexdump the elf and grep for the magic#

21:17 <clever> .word 0x5afe570b

21:17 <clever> but it may be simpler to just delete it, and see if it still boots

21:17 <samueldr> lol, safe stob

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21:31 <samueldr> https://www.xda-developers.com/pro1-x

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23:03 <colemickens> welp, changed deviceTree settings and now old genreatiosn dont boot, whomp whomp

23:03 <colemickens> maybe if I choose the generation instead of it failing and hitting it?

23:08 <colemickens> I think the first time, I filtered the dtb and it picked up the right one in both mainlien/foundation kernels. Then I hardcoded it to the dtb from mainline and it doesn't exist for the old generations using the foundation kernel.

23:12 <colemickens> I bet there's a way to respecify the right dtb at the uboot prompt

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