Dave Prue 6ff005cf19 sunxi: Fix CONFIG_SUNXI_GMAC references 6 年之前
..
MAINTAINERS 585bf8ae6f sun50i: a64: Add A64-OLinuXino initial support 6 年之前
Makefile 6ff005cf19 sunxi: Fix CONFIG_SUNXI_GMAC references 6 年之前
README.nand d2fdcc76e8 scripts: sunxi: Build an raw SPL image 7 年之前
README.sunxi64 c265db7d8b sunxi: update Pine64 README 7 年之前
ahci.c cf7b2e10c9 dm: sata: sunxi: Add support for driver model 6 年之前
board.c 00caae6d47 env: Rename getenv/_f() to env_get() 6 年之前
dram_sun4i_auto.c b0c8f4a797 Kill unneeded #include <linux/kconfig.h> 8 年之前
dram_sun5i_auto.c b0c8f4a797 Kill unneeded #include <linux/kconfig.h> 8 年之前
dram_timings_sun4i.h d133647af4 sunxi: dram: Optionally use standard JEDEC timings for sun[457]i 9 年之前
gmac.c fc8991c61c sunxi: Fix gmac not working due to cpu_eth_init no longer being called 8 年之前
mksunxi_fit_atf.sh 4c78028737 mksunxi_fit_atf.sh: Allow for this to complete when bl31.bin is missing 7 年之前

README.nand

Allwinner NAND flashing
=======================

A lot of Allwinner devices, especially the older ones (pre-H3 era),
comes with a NAND. NANDs storages are a pretty weak choice when it
comes to the reliability, and it comes with a number of flaws like
read and write disturbs, data retention issues, bloks becoming
unusable, etc.

In order to mitigate that, various strategies have been found to be
able to recover from those issues like ECC, hardware randomization,
and of course, redundancy for the critical parts.

This is obviously something that we will take into account when
creating our images. However, the BROM will use a quite weird pattern
when accessing the NAND, and will access only at most 4kB per page,
which means that we also have to split that binary accross several
pages.

In order to accomodate that, we create a tool that will generate an
SPL image that is ready to be programmed directly embedding the ECCs,
randomized, and with the necessary bits needed to reduce the number of
bitflips. The U-Boot build system, when configured for the NAND will
also generate the image sunxi-spl-with-ecc.bin that will have been
generated by that tool.

In order to flash your U-Boot image onto a board, assuming that the
board is in FEL mode, you'll need the sunxi-tools that you can find at
this repository: https://github.com/linux-sunxi/sunxi-tools

Then, you'll need to first load an SPL to initialise the RAM:
sunxi-fel spl spl/sunxi-spl.bin

Load the binaries we'll flash into RAM:
sunxi-fel write 0x4a000000 u-boot-dtb.bin
sunxi-fel write 0x43000000 spl/sunxi-spl-with-ecc.bin

And execute U-Boot
sunxi-fel exe 0x4a000000

On your board, you'll now have all the needed binaries into RAM, so
you only need to erase the NAND...

nand erase.chip

Then write the SPL and its backup:

nand write.raw.noverify 0x43000000 0 40
nand write.raw.noverify 0x43000000 0x400000 40

And finally write the U-Boot binary:
nand write 0x4a000000 0x800000 0xc0000

You can now reboot and enjoy your NAND.