Dear "David Collier", In message <memo.20091021160842.44...@postmaster+dexdyne.com.cix.co.uk> you wrote: > If I boot this unit, then remove the SD card it booted from and reset it, > it happily boots some Linux image which is lying around in memory.
Maybe you should start reading the documentation? > It even does it after a short power-off power-on sequence. It takes time until memory loses it's content, and as long as the checksums are OK the image is still valid. It is up to you to provide a sane boot command which checks for error code. > I think that's horrible behaviour. Indeed - but that's not U-Boot's fault, it's horrible programming by the user, i. e. yourself. > I was told I could use && instead of ; between the commands in the > bootcmd string to stop this, but that barfed, and then I was told that You really should read the documentation, at least the FAQ, for example "14.2.16. How the Command Line Parsing Works" at http://www.denx.de/wiki/view/DULG/CommandLineParsing > maybe && only existed if "scripting is enabled" Whoever told you that used poor language. What he meant was: if the Hush shell is configured as command line parser for your board. > Could anyone please talk me through the steps of either > > 1. doing what it takes to enable this && feature, so that if it fails to > find the card, it doesn't go on and try to boot. To enable the hush shell, you have to set (at least) the CONFIG_SYS_HUSH_PARSER configuration option in your board config file. But even the old, simple command line parser can be used to do what you want. Just RTFM. > 2. something else that will do it, such as so effectively buggering up an > image that has been booted from that it will never be re-used I cannot parse that. If an image has been booted, U-Boot is gone and out of the way, and whatever code was in the image is running. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de "Just Say No." - Nancy Reagan "No." - Ronald Reagan _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
