On 12.02.21 19:59, Grant Likely wrote:
> If the platform has an RTC, then EFI_GET_TIME and EFI_SET_TIME are required
> before ExitBootServices(). Clarify this in the spec.
>
> Also specify that EFI_{GET,SET}_WAKEUP_TIME are required before
> ExitBootService() if the RTC can wakeup the platform.
>
> Signed-off-by: Grant Likely <[email protected]>This patch cannot be applied to upstream: Applying: Refine RTC requirements error: patch failed: source/chapter2-uefi.rst:319 error: source/chapter2-uefi.rst: patch does not apply Please, rebase. Best regards Heinrich > --- > source/chapter2-uefi.rst | 15 +++++++++------ > 1 file changed, 9 insertions(+), 6 deletions(-) > > diff --git a/source/chapter2-uefi.rst b/source/chapter2-uefi.rst > index f47a98d..3d48c99 100644 > --- a/source/chapter2-uefi.rst > +++ b/source/chapter2-uefi.rst > @@ -319,16 +319,16 @@ are required to be implemented during boot services and > runtime services. > - Before ExitBootServices() > - After ExitBootServices() > * - `EFI_GET_TIME` > - - Optional > + - Required if RTC present > - Optional > * - `EFI_SET_TIME` > - - Optional > + - Required if RTC present > - Optional > * - `EFI_GET_WAKEUP_TIME` > - - Optional > + - Required if wakeup supported > - Optional > * - `EFI_SET_WAKEUP_TIME` > - - Optional > + - Required if wakeup supported > - Optional > * - `EFI_SET_VIRTUAL_ADDRESS_MAP` > - N/A > @@ -387,8 +387,11 @@ it may not be possible to access the RTC from runtime > services. > e.g., The RTC may be on a shared I2C bus which runtime services cannot access > because it will conflict with the OS. > > -If firmware does not support access to the RTC, then GetTime() and > -SetTime() shall return EFI_UNSUPPORTED, > +If an RTC is present, then GetTime() and SetTime() must be supported > +before ExitBootServices() is called. > + > +However, if firmware does not support access to the RTC after > +ExitBootServices(), then GetTime() and SetTime() shall return EFI_UNSUPPORTED > and the OS must use a device driver to control the RTC. > > UEFI Reset and Shutdown > _______________________________________________ boot-architecture mailing list [email protected] https://lists.linaro.org/mailman/listinfo/boot-architecture
