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<norton>
Hello. I installed linux-rt kernel on my ARM machine, how do I tell U-boot to boot rt kernel and not the standard one?
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<CounterPillow>
Depends on how it currently boots your kernel. U-Boot has several ways to tell it how to load a kernel
<CounterPillow>
On Debian systems, it's possible you're using a extlinux.conf file generated by u-boot-menu, but that's not a guarantee since you can also make Debian images that don't do that.
<CounterPillow>
Easiest way to find out is to look at early boot output (usually over serial)
<norton>
I guess I just need to change the symlink
<CounterPillow>
Looks like you're using a boot.scr, which means it may do whatever; its boot behaviour is determined by that script
<CounterPillow>
Also looks like you're using Armbian, so you're unlikely to be using mainline up-to-date u-boot anyway, and should ask Armbian for help
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<norton>
Yes, you're right, I should have asked Armbian. Anyway changing the symlink pointing location to rt kernel was the way! Thanks for the tips
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<pivi>
CounterPillow: I noticed that debian installer defaults to flash-kernel and not the extlinux.conf way of booting. do you know the reasoning there? maybe I should just ask vagrant ...
<CounterPillow>
I have no clue honestly, I never use the Debian installer
<pivi>
CounterPillow: for my curiosity how do you get debian installed? debootstrap?
<CounterPillow>
I make images with debos usually, but I've used debootstrap before as well
<pivi>
ok, looks like a "wrapper" around debootstrap
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<norton>
pivi: how do I enable it in `menuconfig`?
<marex>
norton: make menuconfig [/] CMD_NAND (1) Y Ctrl-C Yes
<pivi>
marex: seems be orphaned in favor of mmdebstrap
<marex>
pivi: uhhhhh ... hum
<pivi>
marex: your answer makes me wonder if you have chatGPT integrated into an irssi plugin
<pivi>
;-)
<marex>
pivi: nope, why ?
<marex>
pivi: I wanted to write "its like yesterday when I last used it", but I guess I keep updating those ancient debian nfsroots over time and its been a while
<f_>
marex: how old is your debian install? :)
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<pivi>
marex: I was just kidding for the very precise answer on how to use the menuconfig
<pivi>
we should start inheriting debian installation. like it was an aged scotch
<Forty-Bot>
mmdebstrap is nice, since you don't need to be root
<marex>
pivi: more like brewing lambic beer, where all kinds of stuff falls into it over time :)
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<Forty-Bot>
sjg1: maybe you should ping masahiro?
<Forty-Bot>
ah, looks like you replied to him
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<pivi>
any pointer to documentation on passing down the dtb to the Linux kernel when booting over EFI on arm64? from what I can tell whithout doing anything I get the U-Boot built-in, but this is not what I want/need
<mps>
pivi: iirc devicetree, but not sure it works
<Tartarus>
2nd arg to bootefi
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<mps>
pivi: sorry, I thought you ask for grub
<pivi>
Tartarus: is there any integration in distroboot/stdboot that would allow loading it from fdtfile? I am trying to figure out how this could work with a smooth out of the box experience with a generic distro
<Tartarus>
Step one is just have U-Boot have the right dtb
<pivi>
thinking at the traditional boot.scr approach that's easy, everything is done by the distro
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<Tartarus>
But yes, pbrobinson and apalos have been talking about it and have an idea
<pivi>
that would mean that there is nothing implemented at the moment ? it's either manual integration or having the right DTB from the very beginning
<Tartarus>
Well, first choice is to have the right dtb, so that everything just works and distros don't have to worry
<Tartarus>
But for the EFI case, yes, pbrobinson and apalos have been talking about how to fix this with Fedora as an examplee
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<pivi>
pbrobinson apalos: if you happen to be willing to share some ideas I am available. I was lately playing around with Debian and this is one of 2 pain points I noticed
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<pivi>
well, FWIW the current distroboot scripts are smart enough to pass ${fdt_addr_r}, if it points to a valid fdt. a preboot cmd does the trick. with the downside that u-boot cannot know the dtb path in the distro rootfs ...
<pivi>
and for Debian is something like `/usr/lib/linux-image-6.1.0-16-arm64/`, e.g. it changes all the time.
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