On 2020-01-13 13:41 -0700, Alan Feuerbacher wrote: > I'm building the LFS systemd development version, and having some > difficulty deciding how to configure some UEFI things. > > I'm using GPT partitions and LVM (Logical Volume Management).
Using LVM for root FS would require an initramfs: http://svn.linuxfromscratch.org/hints/trunk/Root_FS_on_RAID+encryption+LVM.txt /* snip */ > I've had trouble with the "efivarfs" stuff in builds years ago. In > particular, is the line in /etc/fstab necessary or not? I think it is > necessary in my system, partly because efibootmgr (running in the chroot > environment) gives an error complaining about "efivars not defined" > without it. But when I mount an efi directory like so (the stuff below > is all run from the host system, not in the chroot environment): > > mkdir -pv /sys/firmware/efi/efivars > mount -t efivars efivars /sys/firmware/efi/efivars > > efibootmgr runs ok and seems to give reasonable output. Old kernels have /sys/firmware/efi/efivars as a part of sysfs. In newer kernel builds firmware/efi/efivars is an empty directory in sysfs and efivarfs should be mounted here. The old way is CONFIG_EFI_VARS and the new way is CONFIG_EFIVAR_FS, in kconfig. We're using the latter, in the hint: > ## CONFIG_EFI_VARS is not set > ## CONFIG_EFI_RUNTIME_MAP=y > > Location: > -> Firmware Drivers > -> EFI (Extensible Firmware Interface) Support > < > EFI Variable Support via sysfs > [*] Export efi runtime maps to sysfs > > > ## CONFIG_EFIVAR_FS=y/m > > Location: > -> File systems > -> Pseudo filesystems > [*] EFI Variable filesystem /* snip */ > menuentry "GNU/Linux, Linux vmlinuz-5.4.8-lfs-20200109-systemd" { > # linux /vmlinuz-5.4.8-lfs-20200109-systemd root=/dev/sdb4 ro > linux /vmlinuz-5.4.8-lfs-20200109-systemd > root=35e97922-0128-453a-afbf-3f0dd75d98b2 ro > } /* snip */ > The last Boot entry eventually puts out an error message: > > error: disk '3ae2214c-3cf6-4324-80cf-a01741ccbccc' not found Using UUID as the value of "root" in kernel command line would require an initramfs. So in LFS book we just use root=/dev/sd[a-z][1-9]. -- Xi Ruoyao <xry...@mengyan1223.wang> School of Aerospace Science and Technology, Xidian University -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style
