dear all: I am working on arm cortex a8 now, trying to implement "suspend to ram" based on linux 3.0.8. Before i start my work, the soc already support standby(the cpu is on wfi state), so in order to implement "suspend to ram", i think i just need to implement the arch-specific related api. The "suspend to ram" works like this: "echo mem > /sys/power/state" -> enter_state -> suspend_devices_and_enter ->suspend_ops->enter(state) Is that right? Do you think the "suspend to ram" can be realized in this way? In order to power off the cortex A8, i save all the writable co-processor and all modes's state register set, and restore them when resuming. All the code seems work ok, because when I just does not power off the cortex-A8 and jump to excute the resume code, the system works well. But, when I power off the cpu, and wake up and excute resume code, the kernel seem ok, but the busybox toolkit does not work proper, eg: "ls" can not output the result through serial port. i add "printk statement" trying to locate the reason, but at this time, the "ls" work fine. hence, i doubt something must be corrupted after resume. I have checked all the state register and co-processor, having not found any exception, and I also compared all the dram data before power off and after wake up, nothing have changed. Right now, I do not know what has happened, and what should I do to locate the real problem to make the busybox works ok. I also want to know does the linux kernel 3.0.8 support "suspend to ram" like this: "echo mem > /sys/power/state" -> enter_state -> suspend_devices_and_enter ->suspend_ops->enter(state)? Can anyone give me some suggestion? Any comment is welcome, thanks a lot.
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