Jan Janssen <medhe...@web.de> schrieb: > Dimitri John Ledkov <dimitri.j.ledkov <at> intel.com> writes: > >> Both gummyboot and grub-efi have a menu option to reboot into >> firmware, is that not enough? Why do we need to have it from userspace >> / the booted system? >> > > There can be plenty of reasons why the firmware won't provide you with an > option. One of them being a FastBoot implementation that doesn't > initialize USB input devices. And also, if one were to directly boot from > the efi stub without boot loader (and not getting 5000€ in the process). > > But this is primarily a reason of convenience. If your bootloader doesn't > give you a boot to firmware option, or your bootloader is being annoying > and boots to your OS faster than you can interface with it, you're > currently out of luck. I'm not too sure, but grub-efi probably even > requires you to actually specifically create the entry in the > configuration; and touching the grub config is just plain annoying. > Especially if you just want that entry for the one time EFI setup every > once in a blue moon.
I accidently enabled fastboot somehow - I don't remember how. The outcome was that USB legacy support was disabled and thus USB wasn't initialized by my firmware (resulting in a very fast boot because the POST screen was only there for maybe one second instead of 5). That means: Also grub2 (with EFI support) didn't recognize my keyboard because it probably does no USB initialization or relies on USB legacy support to read from keyboard. So I had no chance to get into EFI or EFI shell (even if such a boot option would've been there) which was pretty annoying because my system got stuck in a broken initramfs with no way to fix and continue booting because essential components were missing. I had USB available there in the emergency shell but I didn't know how to boot into the firmware to adjust settings like "boot from USB, boot from CD, ... whatever". So I think a facility like this is really useful. I had to open the case and short-circuit the BIOS reset jumper to get back into business. If I still had some PS/2 keyboard it had probably worked - but old times are gone and so is such type of hardware. In the end, after fixing that problem, everything was straight forward, because I had a bootable backup on USB HDD which is a nightly, snapshotted mirror of my system I could just set as rootfs for the kernel. So it was easy to work out the initramfs problem, recreate it, reboot, voila. It took much much longer to solve this silly USB keyboard problem because at first I thought batteries are empty (searching for "working" batteries took a while), then thought maybe the USB hub or port was broken (and I tried all just to find out that probably not all can be broken at once), until I discovered that the port LED on my USB hub didn't lit up for the keyboard receiver until the kernel was booted - which was one of those enlightening moments. So yes please, get that in. ;-) > Also, the fact that there have been people asking questions about how to > get to the EFI/BIOS has always been there. With this you can just tell > them to "systemctl --firmware reboot" on any modern computer and be done > with it. > > Jan > _______________________________________________ > systemd-devel mailing list > systemd-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- Replies to list only preferred. _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
