On 20 September 2017 at 10:34, Udit Kumar <[email protected]> wrote: > > When we want to have UEFI and OS accessing same media , > Possibilities I see > > 1- Patch OS For status check of media (diversion from generic OS), Good case > will be modify low level driver. > But we may end up some surprises on synchronization. > > 2- no runtime service for OS . I guess this will not be possible > > 3- Way the Vladimir implemented for eMMC, This has risk of losing data in > case of AC power off. > > 4- update hardware with dual view (Ard suggestion) >
5 - abstract direct block device access into a firmware service that is exposed via a DXE_RUNTIME_DRIVER. The UEFI spec allows you to expose entry points into a DXE_RUNTIME_DRIVER module via a UEFI configuration table, and the OS can use a driver that uses the abstracted device rather than the real device. Performance is going to be terrible, probably, and lots of things that are specific to SD/MMC will no longer work, but it is a possibility nonetheless. _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
