Building and using Openwince's JTAG Tools

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Revision as of 14:58, 26 July 2006 by Dtaylor (Talk)

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This page is under construction and may contain mistakes or have missing information. Use of this information is at your own risk and may further damage your hardware. YOU HAVE BEEN WARNED


There is a possibility that you could brick your NAS with these instructions. Please make sure that you read the entire page carefully. There is also the possibility that you could unbrick your Kurobox with these instructions.

Building JTAG tools

JTAG tools command sequence to flash the bootloader

Commands to prepare the Kuro:

start jtag and execute the following commands at the jtag prompt:

jtag> cable parallel 0x378 DLC5
jtag> include motorola/mpc8241/1.2 
jtag> endian big 
jtag> instruction SAMPLE/PRELOAD 
jtag> shift ir 
jtag> shift dr  
jtag> dr 
jtag> instruction EXTEST 
jtag> shift ir 
jtag> initbus mpc824x 
jtag> detectflash 0xFFC00000 

According to the Flash ROM page, the flash map is as follows:

start Size (HEX) size contents
0xFFF80000 0x080000 512 K Empty
0xFFC00000 0x300000 3 MB Linux/initrd
0xFFF00000 0x070000 448 K bootcode.bin
0xFFF70000 0x010000 64K HDD status (OKOKOK)

To read the bootloader which is stored at the area described as bootcode.bin type:

jtag> readmem 0xFFF00000 0x0070000 bootloader 

To write the bootloader type with file u-boot.bin type:

jtag> flashmem 0xFFF00000 u-boot.bin