On 20 September 2017 at 10:39, Ard Biesheuvel <[email protected]> wrote: > 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.
BTW this would go beyond the UEFI spec, and would effectively be a PI/UEFI dependent feature. _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
