linux-kernel - Re: [PATCH 02/11] x86: Add device tree support

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Message-ID: <AANLkTinSr_KYkFNUmWbL2PUzS2Ose7cA5q8xUbLeUr=J@mail.gmail.com>
Date:	Thu, 30 Dec 2010 13:58:09 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Rob Landley <rob@...dley.net>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	devicetree-discuss@...ts.ozlabs.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, sodaville@...utronix.de
Subject: Re: [PATCH 02/11] x86: Add device tree support

On Thu, Dec 30, 2010 at 1:45 AM, Rob Landley <rob@...dley.net> wrote:
> On Thu, Dec 30, 2010 at 2:26 AM, Grant Likely <grant.likely@...retlab.ca> wrote:
>> What is the boot sequence for the embedded x86 platforms?  Is there
>> still a bootloader?
>
> There's no one embedded setup on any platform, but one of the few
> constants of embedded development is trying to eliminate unnecessary
> requirements.
>
> Just on standard-ish PC hardware I've seen people try to stick Linux in the
> BIOS flash (generally not enough room), I've seen people try to stick
> it as the first stage PXE payload, there's the fun and games with
> kexec of emergency kernels for crash dumps...
>
> If the capability to skip an unnecessary bootloader was available, people
> would use it.

Right, but in all of those cases a boot wrapper provides the same
functionality with better flexability, such as being able to provided
the dtb image(s) at install time instead of compile time.

g.
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