In message <OF368071C2.FBC6B7BC-ON00256F42.003F3DF3-00256F42.0044E8BB at marel.is> you wrote: > > Capacitors on the supply provide me with some milliseconds to repond to > power failure, which I would > like to use to do as much cleanup as possible before power is totally > gone. In particular, I am concerned
How many is "some"? If it's not >100 or so it is probably not worht the effort... > with trying to prevent damage to filesystems. The board has Compact Flash > and onboard flash which > are used as filesystems. The board will be used as an industrial > controller. > > Can anyone point me to examples of how this can be handled ? Use the standard methods: use the CF card read-only (many CF cards can be damaged [beyond repair] when you power off while a write operation is in progress). Use a filesystem on the ob-board flash which knows how to handle a loss of power (i. e., use JFFS2). > Can anyone share experience of a similar setup, which filesystems to > select etc ? We usually use ext2 read-only on the CF, JFFS2 for the writable parts on the on-board flash, cramfs for all parts that need not to be written on a regular base (most of your root filesystem including application code, libraries etc.), and a FiST based overlay filesystem in case of software patches need to be added. Best regards, Wolfgang Denk -- See us @ Embedded/Electronica Munich, Nov 09 - 12, Hall A.6 Booth 513 Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de You don't have to stay up nights to succeed; you have to stay awake days.
