Re: The future of legacy BIOS support in Fedora.

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On Sun, 2020-07-05 at 11:50 -0700, John M. Harris Jr wrote:
> On Sunday, July 5, 2020 11:31:41 AM MST Solomon Peachy wrote:
> > On Sun, Jul 05, 2020 at 10:20:01AM -0700, John M. Harris Jr wrote:
> > > Chromebook devices are neither UEFI nor BIOS. You can use GPT
> > > disk layout
> > > while still booting BIOS, which they also don't do. Chromebook
> > > devices
> > > either boot with uboot -> depthcharge or Coreboot -> uboot ->
> > > depthcharge. I don't see how this helps your argument.
> > 
> > If one adds ChromeOS devices into the numbers I posted, then the
> > proportion of BIOS-boot-capable, BIOS-boot-enabled, and/or BIOS-
> > only
> > devices on the market (and their portion of the total install base)
> > goes
> > down, not up.
> > 
> > So using the absense of chromebooks in the numbers I referenced
> > actually
> > boosts, rather than undermines, my argument.  Oh, there were
> > supposedly
> > 17 million chromebooks shipped in 2019, versus 261 million "PCs"
> > and
> > 12-ish million "servers".
> > 
> > ...Is this horse sufficiently dead yet?
> > 
> >  - Solomon
> 
> Actually, Coreboot has a SeaBIOS payload as well, so the x86_64
> Chromebooks 
> are "BIOS-boot-capable" systems. (Coreboot also has a GRUB payload,
> which is 
> used by early Purism devices, before they switched to SeaBIOS, and is
> used by 
> all x86_64 Libreboot systems).

I can also confirm that my Acer C720 Chromebook has a SeaBIOS payload,
which is the only way to go, if you want to boot something other than
ChromeOS:

https://www.chromium.org/a/chromium.org/dev/chromium-os/developer-information-for-chrome-os-devices/acer-c720-chromebook#TOC-Legacy-Boot

The default boot method that ChromeOS uses requires the OS to be signed
by Google's private key, which is a secret, so you can't boot Fedora or
any other distro with it. And AFAIK, you can't install other keys,
you're just supposed to use SeaBIOS for other operating systems.

I don't know much about newer chromebooks, though. But I wouldn't be
surprised if they are the same, since Google doesn't have much reason
to adopt UEFI, provided that they control both the software and the
hardware and that they have already developed a system that works.

Btw, this machine is from 2013. I use it for Coreboot+SeaBIOS
experiments.

Best regards,
Nikolay
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