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U-Boot for MPL SBC

User Manual

 2003 by MPL AG

MEH-10082-002 Rev. D

High-Tech • Made in Switzerland

3.5 Procedures

3.5.1 Updating the bootloader

To update the U-Boot you need a new U-Boot image, which is available on www.mpl.ch. The image may be in a zipped

file containing 3 different file format:

• u-boot-X.Y.Z-BOARD_zip.img

This is a compressed bootloader image file.

• u-boot-X.Y.Z-BOARD.img

This is a uncompressed bootloader image file. It is only used for boards with the ppcboot version < 1.1.3

• u-boot-X.Y.Z-BOARD.bin

This is a raw binary file which is only used to reprogram a badly programmed flash.

The U-Boot update is parted in 2 steps:

• load the image in the memory

• program the flash.

Warning: It may happen, that the environment variables are corrupted after an Update. Therefore it is a good

idea to invoke first the command:

=> printenv

and write the important variables down. At least the variables serial# and ethaddr must be

rewritten to the environment, if the variables are corrupted after an Update.

3.5.1.1 Load the image in the memory

To load the image in the memory choose your preferred load method (tftp, usb, floppy, serial etc) and use the

appropriate load command.

Example with tftpboot:

=> tftpboot 400000 u-boot-0.4.0-MIP405_zip.img

ENET Speed is 100 Mbps - HALF duplex connection

ARP broadcast 1

TFTP from server 192.168.3.17; our IP address is 192.168.3.37

Filename 'u-boot-0.4.0-MIP405_zip.img'.

Load address: 0x400000

Loading: ########################

done

Bytes transferred = 119777 (1d3e1 hex)

3.5.1.2 Program the flash

To simplify the flash programming procedure a special command is implemented:

=> [BOARD] flash mem [LOADADDRESS]

Example on a MIP405:

=> mip405 flash mem

updating bootloader image from memory at 400000

Image Name: U-Boot-MIP405

Created: 2003-07-11 9:23:00 UTC

Image Type: PowerPC U-Boot Firmware (gzip compressed)

Data Size: 121288 Bytes = 118.4 kB

Load Address: fff80000

Entry Point: 00000000

Verifying Checksum ... Uncompressing ... OK

Erasing at fff80000 (sector 56) (start fff80000)

............... done

flash erased, programming from 0x500040 0x80000 Bytes

........OK programming done

With the reset command you can restart the board:

=> reset

Initializing SDRAM, Please stand by..................

U-Boot 0.4.0 (Jul 11 2003 - 10:33:29)