Hi, Jean,

Thanks a lot! But I am not sure, is there the "if " command in uboot? I read the manual and did not find it. I am just work on it for a few weeks, so...

Thanks and Regards,

Bin

Date: Fri, 5 Oct 2007 00:30:42 +0200 Subject: Re: [U-Boot-Users] is it possible to make the booting sequence in U-boot? From: plagnioj@jcrosoft.com To: xubin0712@hotmail.com; u-boot-users@lists.sourceforge.net

You can try to boot your first kernel image and if it does not found your kernel switch to the other with the "if" command.

And if you have a watchdog you can incrise your ttl and if your system does not boot in a predefine laps time you reboot and try your second image.

This the algo Set env try First Boot From First if not enter in entry point Set env try First Boot From second if not enter in entry point Error Message No system available else if watchdog timeout Error Message No system available else Banzai System Start endif endif else if watchdog timeout Error Message No system available else Set env try First Boot From second if not enter in entry point Error Message No system available else if watchdog timeout Error Message No system available else Banzai System Start endif endif endif endif

Best Regards Le 5/10/07 0:17, « Bin » xubin0712@hotmail.com a écrit :

...

Hi, All,

I am trying to make two different booting methods with some booting sequence in u-boot, like the bios in PC does. Basically I have kernel Image 1 in NAND and File system 1 on hard drive, kernel image 2 and File system 2 also on the same NAND Flash. The goal here is try to boot the system from Image 1 and file system 1 first, and if the hard drive fails, the bootloader (u-boot) will try to boot from Image 2 and File system 2 *automatically*. My question is, is it possible to achieve this in uboot? If so, any hints?

Any suggestions are appreciated.

Thanks and Regards,

Bin

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Le 5/10/07 1:02, « Wolfgang Denk » wd@denx.de a écrit :

In message BAY124-W1322E27AA87E199D7EB970A3A80@phx.gbl you wrote:

...

Thanks a lot! But I am not sure, is there the "if " command in uboot? I rea d the manual and did not find it. I am just work on it for a few weeks, so. ..

Yes, there is, if you configure the hush shell as command line parser.

But then:

...

...

Set env try First
Boot From First
    if not enter in entry point
        Set env try First
        Boot From second
            if not enter in entry point
                Error Message No system available
            else
                if watchdog timeout
                    Error Message No system available
                else
                        Banzai System Start
                endif
            endif
    else
        if watchdog timeout
            Error Message No system available
        else
            Set env try First
            Boot From second
            if not enter in entry point
                Error Message No system available
            else
                if watchdog timeout
                    Error Message No system available
                else
                        Banzai System Start
                endif
            endif
        endif
    endif

This is overly complex and not needed at all.

Complex, maybe but its allow you to known the current state of your boot and it just a timeline algo not script the run boot_nand; run boot_flash;print $error_message

Can be represent as fallow

Set env try First Boot From First if not enter in entry point Set env try First Boot From second if not enter in entry point Error Message No system available else Banzai System Start endif endif else Banzai System Start endif

Best regards,

Wolfgang Denk

In message BAY124-W4625D166497D1409005763A3A80@phx.gbl you wrote:

I think there is some problem here. For boot method 1, the kernel image is in NAND and file system in hard drive; for boot method 2, the kernel image and file system is also in the same nand. so if there are some problems wit h the hard drive, the system is already booted, passed uboot and kernel ima ge loading procedure, and will hang with the hard drive filesystem, while t he uboot won't know this.

This is where the watchdog and boot counter enter the game.

Best regards,

Wolfgang Denk

This one sounds great! I will try this one first, and will get the feedback here, thanks a lot!

Regards,

Bin

To: xubin0712@hotmail.com CC: u-boot-users@lists.sourceforge.net From: wd@denx.de Subject: Re: [U-Boot-Users] is it possible to make the booting sequence in U-boot? Date: Fri, 5 Oct 2007 00:32:38 +0200

In message 13049956.post@talk.nabble.com you wrote:

...

I am trying to make two different booting methods with some booting sequence in u-boot, like the bios in PC does. Basically I have kernel Image 1 in NAND and File system 1 on hard drive, kernel image 2 and File system 2 also on the same NAND Flash. The goal here is try to boot the system from Image 1 and file system 1 first, and if the hard drive fails, the bootloader (u-boot) will try to boot from Image 2 and File system 2 *automatically*. My question is, is it possible to achieve this in uboot? If so, any hints?

This is possible, and actually trivial.

Define two environment variables, say "boot_disk" and "boot_nand" to boot from disk or NAND, respectively, such that "run boot_disk" will perform a disk boot the way you want it, and "run boot_nand" will boot form NAND.

Then define "bootcmd" as "run boot_disk;run "boot_nand".

That's all.

See also the manual for additional bells and whistles like watchdog support, boot counter etc.

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de "Life and death are seldom logical." "But attaining a desired goal always is." -- McCoy and Spock, "The Galileo Seven", stardate 2821.7

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