Dear pshambhu, In message <1380633558849-164443.p...@n7.nabble.com> you wrote: > > Can i have a small uboot_stub in the reset entry table, which will boot > initially, and while booting it should select the default booting location > (u-boot1).But if the default booting location fails to boot up then > u-boot_stub should select bootloader u-boot2. > > u-boot_stub will do CRC checksum on the u-boot1, if CRC checksum fails on > that, then u-boot2 will be considered for bootup.
That would be pretty straight-forward (and I'm even tempted to write: trivial) to implement. Just add the CRC checking and selecting part to SPL... > Since its the software, i think it can be done and If it is possible, can > you please tell me which are the files need to be taken care for the file > changes. On the other hand, it does not really solve your problem - how do you fix problems or perform reliable updates of this "small uboot_stub"? I recommend to face the real situation: yes, you can implement all levels of complicated multi-stage boot procedures that promise to provide all kinds of features and reliability - but in the end you still have that small, central critical piece of code, and guess where the nasty bug will be found? Without hardware support (switching boot devices etc.) you cannot implement a 100% reliable solution. And if it's less than 100%, then what's the difference between 99.999% and 99% ? If things go wrong, your're stuck. And I bet Murphy is looking over your right shoulder right when you can't have it. 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 Imagination was given to man to compensate him for what he is not; a sence of humor to console him for what he is. - Fancis Bacon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
