[Question] how to support 'hot boot'?

[Chae-seok Im]

Hello. I'm developing arm7 processor board, specifically cirrus logic ep7212. The expression, 'hot boot' is named by myself. You know 'cold boot' and 'warm boot' already? 'hot boot' means the functionality like this:   When you power up a system, it reloads its previous working environment or context, as quick as possible.   I think, in embedded linux system, this could be implemented like this:   1. When you power down a system, it stores the values of its registers to some location. 2. Contents of DRAM is reserved by back-up batteries. 3. When you power up again, it reloads saved values to the original register. 4. Progress jobs at the points saved previously.   I know this kind of function is implemented in some popular PDAs, like Palm pilot, ... But I don't know it is implemented in any embedded linux system. If you have any information, could you tell me how to support this? I expect your kind answer. Bye.