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

[Maxime Ripard]

Hi Heiko,

On Wed, Nov 09, 2016 at 08:47:12AM +0100, Heiko Schocher wrote:
> 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?

It has been reported here:
http://lists.denx.de/pipermail/u-boot/2016-August/264513.html

> > 
> > 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?

Sure, where do you want me to put it? in doc/README.* or somewhere
else?

Thanks,
Maxime

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