[RFC] Multiboot2 drafting
Vladimir 'φ-coder/phcoder' Serbinenko
phcoder at gmail.com
Mon May 24 18:22:10 UTC 2010
M. Warner Losh wrote:
> In message: <4BECEE31.3060004 at gmail.com>
> Vladimir 'φ-coder/phcoder' Serbinenko <phcoder at gmail.com> writes:
> : Yes and No. multiboot2 describes some aspects of the host system
> : hardware but I've never heard of device trees outside of IEEE1275 or
> : xnu, where it's probably a historical leftover.
>
> It is far from a historical left-over.
I meant the only xnu on i386. It receives a device tree from bootloader
but on most platforms it's either empty or ignored
> Linux critically depends on
> the boot loader on PowerPC to provide it with a tree of devices that
> it cannot otherwise probe. On other architectures, it is becoming an
> optional way to specify the device tree as well. There are many
> different implementations of this, since primarily it is just data and
> boot loaders are good at providing binary blobs to the kernel...
>
Could we come up with a standard of passing this information in multiboot2?
> In addition, Rafal Jawarski has ported this technology to FreeBSD.
> He's presenting a paper on it today at BSDcan:
> http://www.bsdcan.org/2010/schedule/events/171.en.html
> I've reviewed the work, and it goes a long way towards making some of
> the more stupid and repetitive parts of doing a port to a new embedded
> architecture easy.
>
> Warner
>
--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko
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