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

[Jagan Teki]

On Wed, Feb 22, 2017 at 5:03 AM, Maxime Ripard
<maxime.ripard at free-electrons.com> wrote:
> 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?

I've some merge conflicts, trying to resolve and apply directly
otherwise I will let you know to resend.

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.