ChanServ changed the topic of #asahi to: Asahi Linux: porting Linux to Apple Silicon macs | "Does XXX work yet?": https://alx.sh/fs | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Topics: #asahi-dev #asahi-re #asahi-gpu #asahi-alt #asahi-stream #asahi-offtopic | Keep things on topic | Logs: https://alx.sh/l/asahi
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<xdeus>
Hi, I wanna try something similar to Linux From Scatch (LFS) on the M1 Air. I've got Asahi installed and I reserved some space for where I'm going to put the LFS related things. I formatted the reserved space as a single ext4 partition and I can see the data on it with `ls nvme 0:7` in u-boot, so I'd like to boot a kernel now. I was thinking of trying the default Asahi kernel first but I'm not sure if the default Asahi kernel works for
<xdeus>
my own kernel straight away. It seems the default kernel has `CONFIG_EXT4_FS=y` set so I should be able to just boot the kernel directly without initrd/initramfs a nd use some executable as the init on the same ext4 partition as the kernel.
<xdeus>
I just can't figure out what I need to do to get u-boot to boot the kernel. Also, I assume I'd need to pass DTBs to the kernel. From what I understand, those are loaded into some memory address by u-boot and then Linux uses them but I'm no t sure about the specifics.
<xdeus>
Any suggestions on how to get this working?
<chaos_princess>
use efistub
<xdeus>
Oh, that is what Asahi uses as well, right?
<chaos_princess>
asahi uses grub, not sure if grub boots via efistub or other way
<chaos_princess>
*grub boots the kernel
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<xdeus>
Ah right, I looked it up, looks like it's used as an alternative to GRUB, at least on x86_64 PCs
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<chadmed>
if you enable EFI_ZBOOT then the kernel will be built as a PE and can be loaded and jumped to by u-boot if you want to skip grub
<chadmed>
this also lets you use systemd-boot
<chadmed>
well technically the ELF will be compressed and stuck on the end of a PE that decompresses ELF and then jumps to it but that doesnt really matter :p
<xdeus>
Oh I see
<xdeus>
The vmlinuz files in the Asahi /boot partition already appear as PE executables with `file` though
<xdeus>
I guess this is enabled by default then?
<chadmed>
yes
<xdeus>
Also, sorry if I skipped some messages, I had to move my IRC stuff to my phone
<xdeus>
So if the kernel is already a PE executable, how can I load and jump to it from u-boot? I guess I `load` it first but I'm not sure which address to use, there are some variables shown in `printenv` with addresses - kernel_addr_r, loadaddr and some others
<chaos_princess>
load it to kernel_addr_r, then there is a command that is something like efiboot or bootefi
<chadmed>
its just `boot` afaik
<xdeus>
Nice, it booted. Thanks a lot, I'll try to figure out the rest now. <3
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<xdeus>
Hmm, I'm trying to pass the "root" and "init" kernel parameters but it doesn't seem to work, Linux still panics as if I hadn't passed them and shows the message "VFS: Unable to mount root fs on unknown-block(0,0)". I tried setting "bootargs" in u-boot with `setenv` and I also tried setting them in the call to the `linux` command while booted into a GRUB PE32 executable that I copied from Asahi, still the same message. I tried out the
<xdeus>
the "root=/dev/..." one but also neither worked.
<chaos_princess>
boot into systemd-boot or grub from u-boot and use that to boot the kernel itself. arm64 has an unusual way to pass the kernel command line
<xdeus>
Yes I tried GRUB
<chaos_princess>
use an initrd then
<xdeus>
Alright, I'll try it out. I think it should work though since "CONFIG_EXT4_FS=y" and this is an ext4 rootfs, no?
<chaos_princess>
do you have apple nvme as =y? rtkit? all other necessary bits?
<xdeus>
Oh CONFIG_NVME_APPLE is loaded as a module and the RTKIT related ones are all built-in except CONFIG_APPLE_SMC_RTKIT and CONFIG_APPLE_RTKIT_HELPER
<xdeus>
Yep, that worked. Thanks again.
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