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<TITLE>RE: [U-Boot-Users] Field upgrade</TITLE>
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<P><FONT SIZE=2>Hi,</FONT>
<BR><FONT SIZE=2>We use a fail back mecanism for Linux but no such mechanism fo u-boot. </FONT>
<BR><FONT SIZE=2>During the upgrade, we do also a CRC check to be sure that the updgrade was done correctly.</FONT>
<BR><FONT SIZE=2>And with a flag written in a custom config sector of the flash, we can tell to ppcboot if the upgraded kernel was running correctly.</FONT></P>
<P><FONT SIZE=2>But for our safety we won't never upgrade ppcboot.</FONT>
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<BR>
<P><FONT SIZE=2>> -----Original Message-----</FONT>
<BR><FONT SIZE=2>> From: Chris Simmonds [<A HREF="mailto:chris@2net.co.uk">mailto:chris@2net.co.uk</A>]</FONT>
<BR><FONT SIZE=2>> Sent: Tuesday, December 02, 2003 3:39 PM</FONT>
<BR><FONT SIZE=2>> To: u-boot-users@lists.sourceforge.net</FONT>
<BR><FONT SIZE=2>> Subject: [U-Boot-Users] Field upgrade</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Hi,</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> One of my requirements is that the firmware be field upgradeable. The </FONT>
<BR><FONT SIZE=2>> problem at the moment is that if something goes wrong while </FONT>
<BR><FONT SIZE=2>> erasing and </FONT>
<BR><FONT SIZE=2>> programming a new u-boot there is no recovery without a jtag/bdm </FONT>
<BR><FONT SIZE=2>> debugger. Does anyone have a solution, or is it not a problem in </FONT>
<BR><FONT SIZE=2>> practice? I was playing with the idea of having a backup </FONT>
<BR><FONT SIZE=2>> u-boot and some </FONT>
<BR><FONT SIZE=2>> method of falling back to it if the primary copy is corrupt.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Chris.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> -- </FONT>
<BR><FONT SIZE=2>> Chris Simmonds 2net Limited</FONT>
<BR><FONT SIZE=2>> chris@2net.co.uk <A HREF="http://www.2net.co.uk/" TARGET="_blank">http://www.2net.co.uk/</A></FONT>
<BR><FONT SIZE=2>> Tel: +44 (0)1962 869003 Fax: +44 (0)870 056 7556</FONT>
<BR><FONT SIZE=2>> "If it's not connected, it's not effective"(tm)</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
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