Hi Heiko,
On Tue, Oct 22, 2013 at 6:25 AM, Heiko Schocher hs@denx.de wrote:
If no softreset save registers are found on the hardware "bootcount" is stored in the environment. To prevent a saveenv on all reboots, the environment variable "upgrade_available" is introduced. If "upgrade_available" is 0, "bootcount" is always 0 therefore no need to save the environment on u-boot boot, if "upgrade_available" is 1 "bootcount" is incremented in the environment and environment gets written on u-boot start. So the Userspace Applikation must set the "upgrade_available" and "bootcount" variable to 0 (for example with fw_setenv), if a boot was successfully.
Signed-off-by: Heiko Schocher hs@denx.de
Just curious... why not save the bootcount in a RTC scratchpad register? IIRC that's persistent across boot cycles if there's battery backup.