Re: [Gumstix-users] Proper Procedure to Upgrade JFFS2 and uimage

[Richard B. <rl...@gm...>]

Dave,

Thanks for the explanation of why it has to be padded. I suspected it
had to do with filling the unused space with a safe value.

I have been flashing via ssh/scp for a while now without problems. I
don't usually replace u-boot unless I changed something that I expect
to effect it.

Richard

On Dec 10, 2007 12:35 PM, Dave Hylands <dhy...@gm...> wrote:
> Hi Richard,
>
> > And, since it is a Verdex board, I should pad the file system as stated
> > in http://docwiki.gumstix.org/Replacing_the_filesystem_image, right?
>
> Padding is only required when you're writing the flash from linux. If
> you're writing the flash from u-boot then the padding isn't required
> and will just slow down the transfer.
>
> In u-boot since you erase everything first, the unwritten sectors will
> be "empty".
>
> In linux, it only replaces the sectors in the file, so the unwritten
> sectors don't get erased. That's why it needs to be padded.
>
> > Okay, I got my new board, since I messed up the last one during a
> > reflash of the u-boot.  I just want to make sure I do this right.
> >
> > If I do the following commands, am I correct in my understanding that my
> > u-boot will remain intact and, even if my jffs2 file is completely
> > screwed up, that I will still be able to boot to the GUM prompt?  As
> > long as I don't mess up my u-boot file, it is my understanding that
> > there is no chance (or very little chance) that I will have to get my
> > board reflashed.
>
> The pro on 1:0-1 is the magic that protects u-boot from being erased.
> It's also important to make sure that the destination address is
> 40000.
>
> >
> > Here are the commands I plan to run:
> > GUM>loadb a2000000
> >   ***send jffs2 file over Kermit***
> > GUM>pro on 1:0-1 && jera all && cp.b a2000000 40000 ${filesize}
>
> I HIGHLY recommend that after doing the loadb command, that you do:
>
> crc32 a2000000 ${filesize}
>
> and compare the crc against the crc for the file on the host.
>
>
> >
> > GUM>loadb a2000000
> >   ***send uimage file over Kermit***
> > GUM>katinstall 100000
> > GUM>katload 100000
> > GUM>bootm
> >
> > Sorry for being anal, but I think I might have an annurism if I hose
> > this board after waiting over a week to get it.  They key seems to be
> > ensuring that I run the "pro on 1:0-1" command to protect the u-boot
> > sectors, right?  Also, is it better to tranfer the files using loadb or
> > loady?  I've seen tutorials showing both methods.  Is either the
> > "preferred" method?
>
> I prefer loady
>
> Actually, I prefer to use an MMC card or tftp since both methods are
> MUCH faster than using loadb or loady
>
> --
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
>
>
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