On Tue, 4 Dec 2018 17:56:48 +0530 Vignesh R vigneshr@ti.com wrote:
U-Boot SPI NOR support (sf layer) is quite outdated as it does not support 4 byte addressing opcodes, SFDP table parsing and different types of quad mode enable sequences. Many newer flashes no longer support BANK registers used by sf layer to a access >16MB space. Also, many SPI controllers have special MMIO interfaces which provide accelerated read/write access but require knowledge of flash parameters to make use of it. Recent spi-mem layer provides a way to support such flashes but sf layer isn't using that. This patch series syncs SPI NOR framework from Linux v4.19. It also adds spi-mem support on top. So, we gain 4byte addressing support and SFDP support. This makes migrating to U-Boot MTD framework easier.
Glad to see that happen sooner than I had expected. Looks like the patch series is in a good shape already, and I'm happy to see the u-boot spi-nor layer being based on the Linux one.
Good job, and thanks again for working on that!
Boris