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<courmisch>
would the kernel be amenable to a syscall (prctl?) to turn V *off*? I'd like to force a SIGILL to trap and emulate different vector lengths...
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<palmer>
courmisch: there should be one already
<palmer>
PR_RISCV_V_{SET,GET}_VS
<palmer>
looks like we forgot to document it, though ;)
<palmer>
oh, no, it's in the vector doc
<sevan>
does the EFI volume always need to be mounted via fstab on Ubuntu? had a powercut due to a blown fuse and riscv sbc wouldn't boot until the EFI (fat) partition was fsck'd.
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<jrtc27>
only if you want to be able to write to it
<jrtc27>
or read
<jrtc27>
i.e. probably only if you're running apt upgrade
<jrtc27>
odd it needed a fsck though, I wouldn't expect it to be at all dirty in normal operation...
<jrtc27>
yeah but nothing should actually be writing to it
<jrtc27>
normally
<jrtc27>
so why would it need a fsck?
<sevan>
fat is fragile, if you don't unmount, fs is marked dirty and it causes problems.
<sevan>
not riscv specific, just a terrible FS
<courmisch>
it's easy to implement and supported by all bootloaders under the sun though
<courmisch>
not sure you can even use anything else for EFI
* courmisch
is loosing hope of riscv_hwprobe in glibc
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<sevan>
courmisch: I was hoping that folks who are building this stuff would avoid the fstab entry.
<sevan>
the war on replacing EFI with Open Firmware can start later.
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<courmisch>
anyone looked at the K230 SDK? Do you need to rebuild the firmware yourself? I couldn't find images, but then again I can't read Chinese
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<Esmil>
sevan: if you're feeling adventurous you can try adding x-systemd.automount,x-systemd.idle-timeout=2min to the options in your fstab
<Esmil>
This way it should be mounted when something tries to access /boot/efi and unmounted if idle for >= 2min
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<Esmil>
sevan: oh and noauto too
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<sevan>
Esmil: thanks, so it won't auto mount by default, but if something tries to access /boot/efi, systemd-automounter will intervene and then unmount if nothing has touched that path in 2minutes?
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<Esmil>
exactly
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<sevan>
Esmil: that works, it automounts/unmounts the fs. only thing is that FS permission is 700 for /boot/efi. Should be an issue as I don't need to touch it as a user and updates via apt are done as root anyway.
<sevan>
derp, I meant to say that the permission is *now* 700 for /boot/efi. Should *not* be an issue
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<Esmil>
sevan: yeah, if you're worried about the permissions of the underlying directory, you can mkdir copy-of-root; mount --bind / copy-of-root; chmod 0755 copy-of-root/boot/efi; umount copy-of-root
<Esmil>
..but if it's after the filesystem is mounted you probably need to add some more vfat-specific mount options
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<sevan>
Esmil: it is after the file system is mounted. No worries, I'll leave it as is. Thanks for the pointer.
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