[U-Boot] [PATCH 0/7] sunxi: Add support for the CHIP Pro

[Heiko Schocher]

Hello Maxime,

Am 08.11.2016 um 17:21 schrieb Maxime Ripard:
> 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.

What was the problem?

>
> Let me know what you think,
> Maxime
>
> Boris Brezillon (1):
>    mtd: nand: add support for the TC58NVG2S0H chip
>
> Hans de Goede (1):
>    sunxi: Enable UBI and NAND support
>
> Maxime Ripard (5):
>    sunxi: Sync GR8 DTS and AXP209 with the kernel
>    tools: sunxi: Add spl image builder
>    nand: sunxi: Add options for the SPL NAND configuration
>    scripts: sunxi: Build an raw SPL image
>    sunxi: Add support for the CHIP Pro
>
>   Makefile                          |    3 +-
>   arch/arm/dts/Makefile             |    1 +-
>   arch/arm/dts/axp209.dtsi          |    6 +-
>   arch/arm/dts/ntc-gr8-chip-pro.dts |  266 +++++++-
>   arch/arm/dts/ntc-gr8.dtsi         | 1132 ++++++++++++++++++++++++++++++-
>   configs/CHIP_pro_defconfig        |   27 +-
>   drivers/mtd/nand/Kconfig          |   16 +-
>   drivers/mtd/nand/nand_ids.c       |    3 +-
>   include/configs/sunxi-common.h    |   26 +-
>   scripts/Makefile.spl              |   12 +-
>   tools/.gitignore                  |    1 +-
>   tools/Makefile                    |    1 +-
>   tools/sunxi-spl-image-builder.c   | 1113 +++++++++++++++++++++++++++++-
>   13 files changed, 2603 insertions(+), 4 deletions(-)
>   create mode 100644 arch/arm/dts/ntc-gr8-chip-pro.dts
>   create mode 100644 arch/arm/dts/ntc-gr8.dtsi
>   create mode 100644 configs/CHIP_pro_defconfig
>   create mode 100644 tools/sunxi-spl-image-builder.c
>
> base-commit: d8bdfc80da39211d95f10d24e79f2e867305f71b

Can you please add a README file, where the above things are explained?

Thanks!

bye,
Heiko
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