Re: [U-Boot] Faster boot time

On 09/26/2011 04:30 PM, Dat Tran wrote:

Sorry for my ignorance on this issue. My current system (Overo) does this when it boots:

 ROM Code -> X-Load (MLO) -> U-Boot -> Linux Kernel -> Root File System

Does the SPL patch allow me to do this?:

 ROM Code -> U-Boot (MLO) -> Linux Kernel -> Root File System

^U-Boot SPL

Also running the latest X-Loader 1.50 and U-Boot 2011.09-rc1, it takes about 2 seconds from power on to starting the Linux Kernel. My Kernel takes 1 second to load and my file system takes another 1.5 seconds for a total of 4.5 seconds from power on to the login prompt on serial. I assume the U-Boot-SPL will only speed up the first half of my boot time.

correct.

If so, how much of a difference do you think I will see with this patch.

I can't say it for your case.

I did this on a devkit8000 loading from NAND. The U-Boot (unoptimized) took 3189 ms and Xloader took 1170 ms. By using the SPL this was reduced to 850 ms. Another patch I'am working on ATM is utilizing DMA to copy the Linux images - this reduces the time spend in SPL to 220 ms.

Thanks.

Regards Simon

On Mon, Sep 26, 2011 at 7:40 AM, Simon Schwarz <simonschwarzcor@googlemail.com mailto:simonschwarzcor@googlemail.com> wrote:

Stands for Second Program Loader.

It loads the U-Boot and runs it - or with this patch a Linux Kernel.

Regards
Simon


On 09/26/2011 02:30 PM, Dat Tran wrote:

    What does SPL stand for again? It looks really interesting.

    Thanks.

    On Mon, Sep 26, 2011 at 3:56 AM, Simon Schwarz
    <simonschwarzcor@googlemail.__com
    <mailto:simonschwarzcor@googlemail.com>
    <mailto:simonschwarzcor@__googlemail.com
    <mailto:simonschwarzcor@googlemail.com>>>

    wrote:

        On 09/25/2011 10:03 PM, dtran11 wrote:


            I am trying to make uboot boot as fast as possible for
    my omap3
            Overo board.
            I add the below to my config header file. Does anyone see
            anything I can add
            to it to make the build smaller and faster?  Thank you.


        [SNIP]

        This may be of interest to you:
    http://article.gmane.org/____gmane.comp.boot-loaders.u-____boot/108814
    <http://article.gmane.org/__gmane.comp.boot-loaders.u-__boot/108814>
    <http://article.gmane.org/__gmane.comp.boot-loaders.u-__boot/108814
    <http://article.gmane.org/gmane.comp.boot-loaders.u-boot/108814>>

        But will take some hacking to adapt.

        Regards
        Simon