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Re: [Gumstix-users] Replacing the filesystem image from a web browser?

From: Carl <carl@co...> - 2007-08-30 12:56

Hi Chris,

I found your control_panel haserl script was complaining about

/bin/sh: Syntax error: Bad substitution

Because of this line:

let RM=${LR:13:11}

So I have changed it to:

RM=`df | grep mtd | sed -e "s/^[^0-9]*\([0-9]\).*/\1/g"`

Maybe you want to consider this as a patch.

Thanks,
Carl

On 6/29/07, Chris Dollar <chris.dollar@...> wrote:
> Hi Carl,
>
> > I would like to provide the ability to replace the file system image
> > through a web page
> > and CGI hosted on the gumstix.  Is this possible, and if so, could
> > someone give me a clue on to do it?
>
> I did just that.  I describe the process here
> http://docwiki.gumstix.org/User:Cdollar  I think that the script
> requires that you have the bash package installed on the gumstix for
> it to work (or you can modify the control_panel cgi to not need bash).
>  If you give it a go and run into any problems just post back to the
> list and I'll help any way I can.  Oh, I should also note that I wrote
> this for my connex gumstix, and it probably will not work on a verdex
> without some tweaks.
>
> Chris
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
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Thread View

Thread	Author	Date
[Gumstix-users] Replacing the filesystem image from a web browser?	Carl Douglas <carl.douglas@gm...>

Re: [Gumstix-users] Replacing the filesystem image from a web browser?

From: Heilpern, Mark <mark.heilpern@au...> - 2007-06-28 11:25

<HTML dir=3Dltr><HEAD><TITLE>[Gumstix-users] Replacing the filesystem =
image from a web browser?</TITLE>=0A=
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dunicode">=0A=
<META content=3D"MSHTML 6.00.6000.16481" name=3DGENERATOR></HEAD>=0A=
<BODY>=0A=
<DIV id=3DidOWAReplyText82865 dir=3Dltr>=0A=
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 size=3D2>The wiki =
contains details behind updating the file system image through the =
/dev/mtd device (</FONT><FONT face=3DArial size=3D2><A =
href=3D"http://docwiki.gumstix.org/Replacing_the_filesystem_image">http:/=
/docwiki.gumstix.org/Replacing_the_filesystem_image</A>&nbsp;-- search =
for flashcp on that page).</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>As long as your ram disk has =
enough space to hold the incoming flash image and you can make certain =
the image is valid and not too large, you should be able to do this via =
CGI.</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>A few caveats to =
consider...</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>First, Verdex has an =
interesting flash process regarding the file system and kernel, since =
the kernel is no longer in the file system. (I would expect the Connex =
to adopt this method soon as well.) In that environment, you first erase =
flash (from 40000 and higher), you then program in the file system, you =
then erase the top 1MB of flash, and finally you place the kernel into =
that space. (The last two steps are done with a single command, =
katinstall, while in U-Boot.)</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Second, if you've got an =
older U-Boot configuration (where bootargs includes "root=3D1f02") and =
you install a new kernel that requires a bootargs change (such as =
"root=3D1f01"), you could leave the system unable to boot without manual =
(serial) intervention.</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Finally, when you're =
programming the new file system, you will need to be certain that no =
running process has an open file handle to any file on the flash file =
system. If anything has an open handle to the old (erased) file system =
and then reads from it, it will receive corrupted data. Worse, if =
something writes to an old (stale) file handle, it will possibly corrupt =
your newly programmed file system.</FONT></DIV></DIV>=0A=
<DIV dir=3Dltr><BR>=0A=
<HR tabIndex=3D-1>=0A=
<FONT face=3DTahoma size=3D2><B>From:</B> =
gumstix-users-bounces@... on behalf of Carl =
Douglas<BR><B>Sent:</B> Thu 6/28/2007 5:38 AM<BR><B>To:</B> =
gumstix-users@...> [Gumstix-users] =
Replacing the filesystem image from a web browser?<BR></FONT><BR></DIV>=0A=
<DIV>=0A=
<P><FONT size=3D2>Hi,<BR><BR>I would like to provide the ability to =
replace the file system image<BR>through a web page<BR>and CGI hosted on =
the gumstix.&nbsp; Is this possible, and if so, could<BR>someone give me =
a clue on to do it?<BR><BR>If others are interested perhaps we could =
create an open source<BR>project to develop the =
CGI.<BR><BR>Thanks,<BR>Carl<BR><BR>--------------------------------------=
-----------------------------------<BR>This SF.net email is sponsored by =
DB2 Express<BR>Download DB2 Express C - the FREE version of DB2 express =
and take<BR>control of your XML. No limits. Just data. Click to get it =
now.<BR><A =
href=3D"http://sourceforge.net/powerbar/db2/">http://sourceforge.net/powe=
rbar/db2/</A><BR>_______________________________________________<BR>gumst=
ix-users mailing list<BR>gumstix-users@... =
href=3D"https://lists.sourceforge.net/lists/listinfo/gumstix-users">https=
://lists.sourceforge.net/lists/listinfo/gumstix-users</A><BR></FONT></P><=
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Re: [Gumstix-users] Replacing the filesystem image from a web browser?

From: Chris Dollar <chris.dollar@gm...> - 2007-06-28 15:07

Hi Carl,

> I would like to provide the ability to replace the file system image
> through a web page
> and CGI hosted on the gumstix.  Is this possible, and if so, could
> someone give me a clue on to do it?

I did just that.  I describe the process here
http://docwiki.gumstix.org/User:Cdollar  I think that the script
requires that you have the bash package installed on the gumstix for
it to work (or you can modify the control_panel cgi to not need bash).
 If you give it a go and run into any problems just post back to the
list and I'll help any way I can.  Oh, I should also note that I wrote
this for my connex gumstix, and it probably will not work on a verdex
without some tweaks.

Chris

Re: [Gumstix-users] Replacing the filesystem image from a web browser?

From: Craig Hughes <craig@gu...> - 2007-06-28 16:01

On Jun 28, 2007, at 4:25 AM, Heilpern, Mark wrote:

> The wiki contains details behind updating the file system image  
> through the /dev/mtd device (http://docwiki.gumstix.org/ 
> Replacing_the_filesystem_image -- search for flashcp on that page).
>
> As long as your ram disk has enough space to hold the incoming  
> flash image and you can make certain the image is valid and not too  
> large, you should be able to do this via CGI.
>
> A few caveats to consider...
> First, Verdex has an interesting flash process regarding the file  
> system and kernel, since the kernel is no longer in the file  
> system. (I would expect the Connex to adopt this method soon as  
> well.) In that environment, you first erase flash (from 40000 and  
> higher), you then program in the file system, you then erase the  
> top 1MB of flash, and finally you place the kernel into that space.  
> (The last two steps are done with a single command, katinstall,  
> while in U-Boot.)

The new layout also has new /dev/mtd partitioning to cover the 3  
areas of flash.  So it should be pretty easy to update using flashcp  
for each of the pieces (u-boot, rootfs, uImage) in a similar way to  
the instructions above, but adding uImage to the last /dev/mtd device  
as well.

> Second, if you've got an older U-Boot configuration (where bootargs  
> includes "root=1f02") and you install a new kernel that requires a  
> bootargs change (such as "root=1f01"), you could leave the system  
> unable to boot without manual (serial) intervention.

Flashing a new u-boot which has the right default bootcmd will take  
care of this problem.

> Finally, when you're programming the new file system, you will need  
> to be certain that no running process has an open file handle to  
> any file on the flash file system. If anything has an open handle  
> to the old (erased) file system and then reads from it, it will  
> receive corrupted data. Worse, if something writes to an old  
> (stale) file handle, it will possibly corrupt your newly programmed  
> file system.

Yes; and more than that, you need to remount the old rootfs read-only  
or else the kernel might have unwritten buffers which it tries to  
write on top of your newly flashed FS, which will definitely break  
things hard.

C

Re: [Gumstix-users] Replacing the filesystem image from a web browser?

From: Carl <carl@co...> - 2007-08-30 12:56

Hi Chris,

I found your control_panel haserl script was complaining about

/bin/sh: Syntax error: Bad substitution

Because of this line:

let RM=${LR:13:11}

So I have changed it to:

RM=`df | grep mtd | sed -e "s/^[^0-9]*\([0-9]\).*/\1/g"`

Maybe you want to consider this as a patch.

Thanks,
Carl

On 6/29/07, Chris Dollar <chris.dollar@...> wrote:
> Hi Carl,
>
> > I would like to provide the ability to replace the file system image
> > through a web page
> > and CGI hosted on the gumstix.  Is this possible, and if so, could
> > someone give me a clue on to do it?
>
> I did just that.  I describe the process here
> http://docwiki.gumstix.org/User:Cdollar  I think that the script
> requires that you have the bash package installed on the gumstix for
> it to work (or you can modify the control_panel cgi to not need bash).
>  If you give it a go and run into any problems just post back to the
> list and I'll help any way I can.  Oh, I should also note that I wrote
> this for my connex gumstix, and it probably will not work on a verdex
> without some tweaks.
>
> Chris
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> gumstix-users mailing list
> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>