[U-Boot] [PATCH v3 00/20] SF: Migrate to Linux SPI NOR framework

[Tom Rini <trini@konsulko.com>]

On Tue, Jan 29, 2019 at 11:19:47AM +0530, Vignesh R wrote:

> Here is the v3 of SPI NOR migration(github branch at [1]). I have
> retained Tested-by from v2 as this is just re split of patches and
> minor fixups.
> 
> Travis ci reports all green.
> 
> Change log:
> Since v2:
> Split sync up patches into smaller versions so that its easier for review.
> Address comments by Jagan and Simon Goldschmidt on v2.
> Make SPI_FLASH_TINY(read only SF stack)  as default for SPL build to
> offset against size increase due to new code.
> 
> Since v1:
> Remove #ifindef __UBOOT__
> Add back BAR support, but dont enable as default for all platform (see
> 10/11 for more details)
> Enable SPI_FLASH_TINY on boards where there is SPL size constraint as
> seen on travis ci builds.
> Drop sf_mtd changes for now as it seems to cause issues.
> v1: https://patchwork.ozlabs.org/cover/1012146/
> 
> Since RFC v2:
> Fix issues reported by Simon Goldschmidt wrt 4 use of byte addressing opcode
> Fix issues in compiling SFDP code
> Re organize file names and Makefile to simply spi-nor-tiny inclusion
> Remove SPI_FLASH_BAR and SF_DUAL_FLASH as these are no longer used
> RFC v2: https://patchwork.ozlabs.org/cover/1007589/
> 
> Since RFC v1:
> Add lightweight SPI flash stack for boards with SPL size constraints
> Provide non DM version of spi-mem
> Fix build issues on different platforms as reported by travis-ci on v1
> 
> RFC v1: https://patchwork.ozlabs.org/cover/1004689/
> 
> Background:
> 
> U-Boot SPI NOR support (sf layer) is quite outdated as it does not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.
> 
> Tested with few Spansion, micron and macronix flashes with TI's dra7xx,
> k2g, am43xx EVMs. I dont have access to flashes from other vendors. So,
> I would greatly appreciate testing on other platforms. Complete series
> with dependencies here[1]
> 
> For clean build on some platforms, depends on CONFIG_SPI_FLASH migration
> to defconfigs [2]
> 
> [1] https://github.com/r-vignesh/u-boot.git  branch: spi-nor-mig-patch-v3
> [2] https://patchwork.ozlabs.org/patch/1007485/

Note that while I should have done -rc1 yesterday (and I'll email about
that on its own shortly), to be clear and for the record, barring
further comments that cannot be addressed in follow-up patches, I really
want to see this merged.  Thanks again all!

-- 
Tom
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