[U-Boot] [PATCH v4 0/16] sunxi: Add support for the CHIP Pro

[Maxime Ripard]

Hi Jagan,

On Tue, Feb 21, 2017 at 10:50:34AM +0530, Jagan Teki wrote:
> On Mon, Jan 23, 2017 at 7:16 PM, Maxime Ripard
> <maxime.ripard at free-electrons.com> wrote:
> > The CHIP Pro is a SoM made by NextThing Co, and that embeds a GR8 SIP, an
> > AXP209 PMIC, a WiFi BT chip and a 512MB SLC NAND.
> >
> > Since the first Allwinner device coming whit an SLC NAND that doesn't have
> > the shortcomings (and breakages) the MLC NAND has, we can finally enable
> > the NAND support on a board by default.
> >
> > This is the occasion to introduce a bunch of additions needed imo to be
> > able to come up with a sane NAND support for our users.
> >
> > The biggest pain point is that the BROM uses a different ECC and randomizer
> > configuration than for the rest of the NAND. In order to lessen the number
> > of bitflips, you also need to pad with random data the SPL image.
> >
> > Since it's quite tedious to do right (and most users won't be able to
> > figure it out) and since if it is not done right, it will eventually turn
> > into an unusable system (which is bad UX), we think that the best solution
> > is to generate an SPL image that already embeds all this. We'll possible
> > have to do the same thing for the U-Boot image (at least for the random
> > padding) on MLC NANDs.
> >
> > The only drawback from that is that you need to flash it raw, instead of
> > using the usual nand write, but it's just a different command, nothing
> > major anyway.
> >
> > In order to flash it, from a device switched in FEL, on your host:
> > sunxi-fel spl spl/sunxi-spl.bin
> > sunxi-fel write 0x4a000000 u-boot-dtb.bin
> > sunxi-fel write 0x43000000 spl/sunxi-spl-with-ecc.bin
> > sunxi-fel exe 0x4a000000
> >
> > And on the board, once u-boot is running (assuming the NAND is already
> > erased):
> >
> > nand write.raw.noverify 0x43000000 0 40
> > nand write.raw.noverify 0x43000000 0x400000 40
> >
> > nand write 0x4a000000 0x800000 0xc0000
> >
> > I also encountered some weird bug in the private libgcc that prevents
> > U-Boot from loading. Disabling CONFIG_USE_PRIVATE_LIBGCC fixes that.
> >
> > Let me know what you think,
> > Maxime
> >
> > Changes from v3:
> >   - Bring new Kconfig patches from Boris
> >   - Do not define Kconfig defaults in our board Kconfig but directly in the
> >     option declaration
> >   - Sync the DT with the kernel
> >   - Fixed build breakages
> >
> > Changes from v2:
> >   - Move CMD_NAND and CMD_UBI default to cmd/Kconfig
> >   - Define the env Kconfig options only for ARCH_SUNXI to avoid build
> >     breakages
> >   - Define CMD_MTDPARTS only for ARCH_SUNXI
> >
> > Changes from v1:
> >   - Allowed to build lib/bch.c for the host, and used that in the image
> >     builder
> >   - Fixed a bug in the NAND driver
> >   - Wrote a documentation on how to flash a NAND image on an Allwinner
> >     board
> >   - Fixed a few compilation breakages and issues
> >   - Moved U-boot offset out of the config header and into Kconfig
> >   - Moved the environment into UBI
> >   - Moved the environment selection to Kconfig
> >   - Moved the CMD_MTDPARTS options to Kconfig
> >   - Provide MTDIDS_DEFAULT and MTDPARTS_DEFAULT options through Kconfig
> >   - Added the tags from everyone
> >
> > Boris Brezillon (3):
> >   mtd: ubi: Select RBTREE option from MTD_UBI Kconfig entry
> >   cmd: Expose a Kconfig option to enable UBIFS commands
> >   cmd: nand: Expose optional suboptions in Kconfig
> >
> > Hans de Goede (1):
> >   sunxi: Enable UBI and NAND support
> >
> > Maxime Ripard (12):
> >   nand: sunxi: Fix modulo by zero error
> >   bch: Allow to build for the host
> >   tools: sunxi: Add spl image builder
> >   common: Move environment choice to Kconfig
> >   cmd: Add Kconfig option for CMD_MTDPARTS and related options
> >   mtd: sunxi: Select the U-Boot location config option
> >   mtd: sunxi: Change U-Boot offset
> >   sunxi: Add the default mtdids and mtdparts to our env
> >   nand: sunxi: Add options for the SPL NAND configuration
> >   scripts: sunxi: Build an raw SPL image
> >   sunxi: Sync GR8 DTS and AXP209 with the kernel
> >   sunxi: Add support for the CHIP Pro
> 
> Reviewed-by: Jagan Teki <jagan at openedev.com>

I'm still getting up to speed wrt. how you merge patches. Are you
waiting for someone, or do you want to merge them through your tree
directly?

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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