rtc: initialize emulated RTC from environment variable
Up to now the emulated RTC is initialized using the U-Boot build time. With this patch the environment variable 'rtc_emul_epoch' can be used to provide a better initial time. The variable is a decimal string with the number of seconds since 1970-01-01. Here is an example where the RTC had not been probed yet: => setenv rtc_emul_epoch 1610109000 => date Date: 2021-01-08 (Friday) Time: 12:30:00 If the variable does not exist, the U-Boot build time is used as fallback. The environment variable may be set when shutting down the operating system if the U-Boot environment is exposed to the OS (cf. ENV_IS_IN_FAT and ENV_IS_IN_EXT4). Suggested-by:Pablo Sebastián Greco <pgreco@centosproject.org> Signed-off-by:
Heinrich Schuchardt <xypron.glpk@gmx.de>
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