On 2019-07-19 20:58, Adam Carter wrote: > I experimented found the following worked in /etc/default/grub; > > GRUB_DEVICE="PARTUUID=d3554d49-02" > > Which writes grub.cfg as; > linux /vmlinuz-5.2.0-gentoo root=PARTUUID=d3554d49-02 ro > init=/usr/lib/systemd/systemd iommu=pt raid=noautodetect > > PARTUUID looked up with blkid. No initramfs required :)
I don't get this. blkid is userspace. The _kernel_ needs to know what the root fs device is, before it even starts pid 1. With initramfs, this egg/chicken problem is hidden: the initramfs itself is the initial root fs, and during the pivot to the real root fs userspace programs [1] are already available. [1] Well, usually just 1 of them: busybox. -- Please don't Cc: me privately on mailing lists and Usenet, if you also post the followup to the list or newsgroup. To reply privately _only_ on Usenet and on broken lists which rewrite From, fetch the TXT record for no-use.mooo.com.
