On Wed, Jun 26, 2013 at 12:32:30PM -0600, Stephen Warren wrote: > >> What about ARMv8? Is the intention to have a separate definition for the > >> UEFI bindings on ARMv8, so that compatibility isn't an issue? What if a > >> future version of UEFI allows LPAE usage? > > > > It is unlikely that will happen on v7 since newer versions of UEFI are > > expected to remain backwards compatible with the current spec. > > The expectation of backwards-compatibility sounds nice, but it seems a > little dangerous to outright rely on it. > > Even if not a regular compatible property, can we define a property that > indicates the UEFI revision or revision of this DT binding, so that if > we ever have to change it, there is some way of explicitly indicating > which exact schema the DT corresponds to, rather than having to > reverse-engineer it from the set of properties that "just happen" to be > present in DT? > > This is rather like the firmware node discussion that happened recently, > where we were expecting to represent a firmware (secure mode) interface > by a DT node, which would have a compatible value, which in turn would > convey information about which "OS" the secure firmware was running, and > well as any potential SoC-/OEM-/board-specific interface provided by it. > > And who knows, what if UEFI gets replaced someday; presumably we'd want > some way of explicitly stating "running under UEFI" vs. "running under > something else"? To me, these concerns are all covered by the existence of the efi-system-table node, and the version number that you can extract from the table (mandatory in any UEFI implementation) located at that address. There is no reverse-engineering involved. / Leif -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html