Hi Tom, On Wed, 4 Aug 2021 at 12:49, Tom Rini <tr...@konsulko.com> wrote: > > On Wed, Aug 04, 2021 at 10:09:55AM -0600, Simon Glass wrote: > > Hi Jagan, > > > > On Tue, 3 Aug 2021 at 09:01, Jagan Teki <ja...@amarulasolutions.com> wrote: > > > > > > Yes, this is the old discussion and triggered again now since we had a > > > discussion on the last U-Boot contributor call. > > > > > > I will brief the main points here, as most of the details are > > > mentioned in previous threads. > > > > > > Here are the couple of old and new implementations on the SPI-NOR side. > > > > > > http://u-boot.10912.n7.nabble.com/PATCH-v10-00-27-dm-Generic-MTD-Subsystem-with-SPI-NOR-interface-tt315694.html#none > > > http://u-boot.10912.n7.nabble.com/PATCH-0-5-mtd-Implement-MTD-UCLASS-use-SPINOR-td419538.html#a419541 > > > https://patchwork.ozlabs.org/project/uboot/cover/20200709111709.68904-1-ja...@amarulasolutions.com/ > > > > > > Idea is to > > > 1. Create MTD_UCLASS, already present > > > 2. Create DM MTD Operations, above patchset does. > > > 3. Create Flash specific MTD UClass's like > > > UCLASS_NAND > > > UCLASS_SPI_NAND > > > UCLASS_SPI_NOR > > > UCLASS_NOR > > > UCLASS_UBI > > > and register to UCLASS_MTD as interface slaves like how MMC, SCSI are > > > registered to UCLASS_BLK > > > 4. Sync only respective flash specific code, and drop __UBOOT__ > > > 5. Interface mtd, sf, and nand commands to UCLASS_MTD. > > > > This all seems good to me. > > > > > > > > Hard points: > > > 1. Hard to arrange Linux specific code and drop unneeded _UBOOT_ code, > > > but possible. > > > 2. Requires a lot of testing. > > > > Let's add simple emulators for NAND, SPI_NAND and UBI. We already have > > one for SPI_NOR I believe. That will be a good long-term investment. > > What are our viable options here via QEMU?
I don't mean QEMU, just sandbox emulators. They are pretty simple to write and faster/easier to run and debug than qemu. Regards, Simon