Hi Jagan, Scott, On Mon, Jan 23, 2017 at 02:46:42PM +0100, Maxime Ripard 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
Any objections to merging that? Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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