UM0851 datasheet(18/245 Pages) STMICROELECTRONICS

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Boot loader overview

UM0851

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Doc ID 16604 Rev 2

Persistent storage commands

This section describes the U-Boot commands used to access non-volatile storage.

mtest

Simple RAM test

mtest 0x1600000 0x1610000 0xff

Memory write fill

mw.l 0x1600000 0x55aa55aa 0x100

Memory modify (constant address)

nm 0x1600000

01600000: 00000000 ? abcdabcd

01600000: abcdabcd ? 12345678

01600000: 12345678 ? 87654321

cmp

Memory compare

cmp.b 0x1300000 0x1600000

0x200000

Memory copy

cp.b 0x1300000 0x1600000

0x300000

Itest

Return true/false on integer compare

loop

Infinite loop on address range

loop 0x1300000 0x10000

Table 3.

Persistent storage U-Boot commands (I2C, NOR, NAND)

Command

Behavior

Example

erase

Erase Flash memory

erase 0xf8000000 +0x10000

erase 1:0-3

flinfo

Print Flash memory information

i2c

I2C subsystem commands

i2c md 0x50 0x0

0000: 14 15 16 17 18 19 1a 1b 1c

1d 1e 1f 20 21 22 23

............ !"#

iminfo

Print header information for application

image

iminfo 0xf8000000

## Checking Image at f8000000

...

Image Name:

XLoader

Image Type:

ARM Linux

Kernel Image (uncompressed)

Data Size:

4472 Bytes =

4.4 kB

Load Address: d2800b00

Entry Point:

d2800b00

Verifying Checksum ... OK

imls

List all images found in NAND/NOR

Flash

nand

NAND command subsystem

nand read.jffs2 0x1300000 0x0

0x10000

nboot

Boot from NAND device

nboot.jffs2 0x1300000 0 0x60000

for the image to boot

automatically, an environment

variable “autostart” is to be

set to “yes”

Table 2.

Memory U-Boot commands (continued)

Command

Behavior

Example

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