NAND patches for legacy kernel and latest u-boot

[andrewz1]

Hi

 

This is my patches for using NAND + UBI + UBIFS with legacy kernel and latest u-boot

Tested on Cubieboard-1 and Cubietruck.

 

U-Boot:

- read-only support for now - i.e. all write/erase ops are locked

 

Kernel:

- pooling events - need to convert to interrupts+completions

 

ToDo:

- make led support

 

NAND layout - driver will create two MTD partitions:

mtd0 - with name "SPL" - 1024K rounded up to eraseblock size.

mtd1 - with name "UBI" - all other space excluding last 4 erseblocks - for bad block table.

 

For using with u-boot need to create ubi volume named "boot" with id=0. This volume must contain /boot/* files.

For other files I use in tests all free space with volume name "root" and id=1 but this is not critical.

 

I used this as module and include in ramdisk - add to /etc/initramfs-tools/modules next lines:

sunxi_nand
ubi mtd=1 <- this is which mtd attach at boot
ubifs

In /boot/boot.cmd should be changed:

in bootargs: root=ubi0:root rootwait rootfstype=ubifs 

boot images:

ubifsload ${fdt_addr_r} script.bin
ubifsload ${ramdisk_addr_r} uInitrd || setenv ramdisk_addr_r "-"
ubifsload ${kernel_addr_r} zImage

in /etc/fstab

ubi0:root / ubifs defaults,noatime 0 0
ubi0:boot /boot ubifs defaults,noatime 0 0

Kernel configuration:

CONFIG_MTD=m
CONFIG_MTD_CHAR=m
CONFIG_MTD_NAND_IDS=m
CONFIG_MTD_NAND_ECC=m
CONFIG_MTD_NAND=m
CONFIG_MTD_NAND_SUNXI_NAND=m
CONFIG_MTD_UBI=m
CONFIG_MTD_UBI_WL_THRESHOLD=256 <- for MLC NAND
CONFIG_MTD_UBI_BEB_RESERVE=1

In U-Boot config only need to set 

CONFIG_NAND_SUNXI_ALT=y

 All other things (MTD, UBI, UBIFS) will be included automatically.

 

PS Sorry for my English

 

kernel-nand.patch.gz

uboot-nand.patch.gz

[hararmbian]

So, with this patch I can boot the latest u-boot using legacy kernel 3.4.x ?

 

If it is, then it's the one that I've been searching all along.

 

Will try it if I have a chance...and post the result.

[andrewz1]

So, with this patch I can boot the latest u-boot using legacy kernel 3.4.x ?

Yes, I tested with latest u-boot on Cubieboard-1 and Cubietruck (A20). Two my cubietruck boards have bad flash chips, but I replaced it by another one from old USB flash dongle. After this all works fine.