Date: Tue, 28 May 2019 16:41:15 +0100 From: Edward Napierala <trasz@freebsd.org> To: Eric McCorkle <eric@metricspace.net> Cc: Warner Losh <imp@bsdimp.com>, Nathan Whitehorn <nwhitehorn@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: FreeBSD and Coreboot Message-ID: <CAFLM3-rLTj-fc9Nhz6RqbN=aGPFudgJNdfczKJ_=wsBbaJuiKw@mail.gmail.com> In-Reply-To: <f65401e3-40ea-fd43-07f2-13b9663c8cd9@metricspace.net> References: <4a6b0f1e-64ec-6b83-b43b-f9791ec8428f@metricspace.net> <CAFLM3-rMJmPs4OvRczDtiENtYaSpODRGQaFuONc%2BouxchJQDxw@mail.gmail.com> <1452db0c-1210-3230-c044-bc682e7e1745@metricspace.net> <3aa00c6b-2502-ffad-c915-a833292882bd@freebsd.org> <CANCZdfovLtbwN-mLHSZKNsFwcjX0NzK82TFZunuGJDyHVj709w@mail.gmail.com> <79c249c0-e6b0-a584-ad23-c9a4f57ff3c1@freebsd.org> <CANCZdfoTgyxOoKWqYBUh3ck_Jww3xf6SbKu6vC5a9erH4qOw0Q@mail.gmail.com> <f65401e3-40ea-fd43-07f2-13b9663c8cd9@metricspace.net>
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On Tue, 28 May 2019 at 12:17, Eric McCorkle <eric@metricspace.net> wrote: [..] > > Now that the loader supports a ram disk, we are almost to something > > useful... but yea, almost and crummy often go hand in hand. > > This is looking out ahead of my current roadmap, but if you were to do a > kernel as the coreboot payload, there'd need to be some kind of trick to > support ZFS-only systems. > > ZFS requires modules, which are typically pre-loaded (and linked) by > loader (or GRUB). Coreboot has no disk or filesystem or even device > access facilities, however. It's just "pull an image out of flash, do > the bare essential hardware initialization to get to a C runtime > environment, then jump into the image". A ramdisk could help with that - boot with UFS-formatted ramdisk image as rootfs, have init(8) execute a script that loads zfs.ko and whatever other kernel module that's neccessary, and reroot into ZFS.
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