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corrupt fis detection

From: Sumit Chauhan <sumitchauhan79 at gmail dot com>
To: ecos-discuss at sources dot redhat dot com
Date: Sun, 6 Mar 2005 22:32:38 -0500
Subject: [ECOS] corrupt fis detection
Reply-to: Sumit Chauhan <sumitchauhan79 at gmail dot com>

Hi,

we are erasing the fis block from linux kernel and rewritting it with
new information every time on a successfull boot up.

In case of power failure, this I realise opens up a window of error.
Between erase and final write if power reset happens. 
Can we be sure that fis will detect that its an unprogrammed fis and act ?
how does redboot detect that fis is blank, some magic number etc ?

Can we be sure that redboot will atleast not get screwed in reading
half cooked information ?

any other way to do this ?

Cheers,
Sumit

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