Linux seamless booting

[Roberto Guerra]

Did you try "setenv bootdelay 0" in uboot?

On Mon, Oct 12, 2009 at 7:07 AM, Fortini Matteo <matteo.fortini at mta.it> wrote:
> Hi all,
> we've been working on a PPC512x board booting with u-boot + linux 2.6.24.6,
> and one major issue for our application is boot time.
>
> Right now, we went down to less than 6s boot time (i.e. time from power off
> to launch of the user app), even with some drivers installed, i.e.:
>
>   * CAN bus
>   * GPU on PCI bus
>   * USB host
>   * UBI
>
> with r/o squashfs root and r/w ubifs configuration filesystem mounted from a
> NOR flash memory.
>
> This time could be enough for the high-level application (we're showing a
> splash screen in about 2-3s so it's ok if the main app takes a little longer
> to come up), but the whole system is connected to others via CAN and we
> can't afford the "black out" period between u-boot and linux.
>
> Some other operating systems (e.g. QNX) have this "seamless booting"
> function, in which drivers are started in stages, so that a (minimal)
> functionality can be given in milliseconds, and more functionalities come up
> as time goes by.
>
> Is there a way to support something similar with the u-boot -> linux
> solution?
>
> Thank you,
> Matteo
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