On Thu, 29 Oct 2020 at 21:20, Heinrich Schuchardt xypron.glpk@gmx.de wrote:
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: 12:30:00If 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
drivers/rtc/Kconfig | 13 ++++++++----- drivers/rtc/emul_rtc.c | 16 +++++++++++++--- 2 files changed, 21 insertions(+), 8 deletions(-)
Reviewed-by: Simon Glass sjg@chromium.org