BeagleBoardNAND

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Revision as of 04:10, 27 July 2008 by Dirk (Talk | contribs) (Add some details about kernel and file system)

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This page is about using (booting/running from) NAND memory on BeagleBoard. Parts of this page are inspired by Steve's flash procedure document.

Hardware

OMAP3530 has 256MB NAND flash in PoP (PoP: Package-On-Package implementation for Memory Stacking) configuration.

  • BeagleBoard has 256MB of Micron NAND
  • EVM 128MB of Samsung OneNAND or 128MB of Micron NAND
  • Zoom MDK also uses the Micron NAND

Software

The following software parts can be stored and booted/run from NAND:

  • X-Loader
  • U-Boot (+ environment/configuration data)
  • Linux kernel
  • Linux file system

The memory partitioning for this as used on BeagleBoard:

0x00000000-0x00080000 : "X-Loader"
0x00080000-0x00260000 : "U-Boot"
0x00260000-0x00280000 : "U-Boot Env"
0x00280000-0x00680000 : "Kernel"
0x00680000-0x10000000 : "File System"

To be able to write something to (empty) NAND, you first need to boot from an other source, e.g. MMC/SD card boot. Besides the files you need for MMC/SD card boot (MLO & U-Boot), put the files you want to flash into first FAT partition of MMC/SD card, too. Then you can read them from there and write them to NAND.

Note: If something goes wrong writing the initial X-Loader, your board might not boot any more without pressing the user button. See BeagleBoard recovery article how to fix this, then.

X-Loader

Build or download binary (x-load.bin.ift_for_NAND) X-Loader. Put it at first (boot) FAT partition of MMC/SD card and boot from card. Then start boot from card and use the following to write X-Loader to NAND:

...40T.......

Texas Instruments X-Loader 1.41
Starting on with MMC
Reading boot sector

147424 Bytes Read from MMC
Starting OS Bootloader from MMC...

U-Boot 1.3.3-00411-g76fe13c-dirty (Jul 12 2008 - 17:12:05)

OMAP3530-GP rev 2, CPU-OPP2 L3-165MHz
OMAP3 Beagle Board + LPDDR/NAND
DRAM:  128 MB
NAND:  256 MiB
In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0

OMAP3 beagleboard.org # mmcinit
OMAP3 beagleboard.org # fatload mmc 0:1 80000000 x-load.bin.ift_for_NAND
reading x-load.bin.ift_for_NAND

9808 bytes read
OMAP3 beagleboard.org # nand unlock
device 0 whole chip
nand_unlock: start: 00000000, length: 268435456!
NAND flash successfully unlocked
OMAP3 beagleboard.org # nand ecc hw
OMAP3 beagleboard.org # nand erase 0 80000

NAND erase: device 0 offset 0x0, size 0x80000
Erasing at 0x60000 -- 100% complete.
OK
OMAP3 beagleboard.org # nand write 80000000 0 80000

NAND write: device 0 offset 0x0, size 0x80000
524288 bytes written: OK
OMAP3 beagleboard.org #

Note: The command nand ecc hw is essential here! X-Loader is started by OMAP3 boot rom. This uses HW ECC while reading the NAND, so while writing, we have to use OMAP3 HW ECC, too. If you don't use HW ECC boot rom can't boot from NAND any more.

U-Boot

Build or download binary (flash-uboot.bin) U-Boot. Put it at first (boot) FAT partition of MMC/SD card and boot from card. Then start boot from card and use the following to write U-Boot to NAND:

OMAP3 beagleboard.org # mmcinit
OMAP3 beagleboard.org # fatload mmc 0:1 80000000 u-boot.bin
reading u-boot.bin

147424 bytes read
OMAP3 beagleboard.org # nand unlock
device 0 whole chip
nand_unlock: start: 00000000, length: 268435456!
NAND flash successfully unlocked
OMAP3 beagleboard.org # nand erase 80000 160000

NAND erase: device 0 offset 0x80000, size 0x160000
Erasing at 0x1c0000 -- 100% complete.
OK
OMAP3 beagleboard.org # nand write 80000000 80000 160000

NAND write: device 0 offset 0x80000, size 0x160000
 1441792 bytes written: OK
OMAP3 beagleboard.org #

Note: You can use the same u-boot.bin you use to boot from MMC/SD card for NAND. There are no differences between U-Boot used for MMC/SD card boot and NAND boot.

Note: Here, you don't need the nand ecc hw option. X-Loader which loads & starts U-Boot is able to understand SW ECC written by U-Boot.

Kernel

While X-Loader and U-Boot can be written only by U-Boot, for kernel and file system there are two ways to write them to NAND: Either by U-Boot (similar way as for X-Loader and U-Boot above) or from running kernel (e.g. booted from MMC card).

Note: X-Loader and U-Boot can't be written from already running kernel, too, because from kernel point of view X-loader and U-Boot NAND partitions are marked as write only. See omap3beagle_nand_partitions[] configuration structure in kernel's arch/arm/mach-omap2 directory.

Writing kernel with U-Boot

tbd.

Writing kernel with kernel

tbd.

File system

As with kernel, while X-Loader and U-Boot can be written only by U-Boot, for file system there are two ways to write them to NAND: Either by U-Boot (similar way as for X-Loader and U-Boot above) or from running kernel (e.g. booted from MMC card).

Writing file system with U-Boot

tbd.

Writing file system with kernel

tbd.