On Mon, 10 May 2021 at 09:40, Avri Altman <Avri.Altman@xxxxxxx> wrote: > > > In the SD spec v6.x the SD function extension registers for performance > > enhancements were introduced. As a part of this an optional internal cache > > on > > the SD card can be used to improve performance. > Just to verify that you are aware of that: > In addition to the extension Registers that were defined in the physical core spec, > there was a separate document that was released that suggest a common OS API's to those registers. > It is called "SD specification part A5, SD Extensions API specification". Thanks for the pointer! I did have a very brief look at this. The conclusion I made is that this is way over designed to enable support for features like cache and poweroff notification. However, there may be other use cases that could benefit from a user space library, along the lines of the SD Extensions API, but I can't really tell. Do you have an interest around this that you can share? Thanks for reviewing! Kind regards Uffe
