Re: Super Fast Boot of Embedded Linux: 300 ms from boot loader to shell

[Robert Schwebel <r.schwebel@pengutronix.de>]

On Thu, Apr 14, 2011 at 09:43:35AM +0200, Matthieu CASTET wrote:
> Not to say such case are not interesting : loading a linux kernel with
> only a serial driver, a ramdisk and a shell as init doesn't reflect
> reality.
>
> In real product what you want if fast user interaction (sound,
> mounting big filesystem with user data, lcd display, ...)

Well, it depends on the application. In the automotive box I've shown
the barebox based boot optimizations for in my ELC-E talk, the task is
to get CAN communication running in < 200 ms. For that kind of
application it's useful to be in userspace as fast as possible, just in
order to have one socket-can application running, and everything else
comes later.

rsc
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