Hi Sadashiv,

On 28.03.2013 16:11, Sadashiva Reddy wrote:

I am using AMCC PPC440Gx processor for our project presently the board is working fine with vxWorks(BSP + OS + Application). But our customer new requirement is same board should be ported with linux.

1. We are using BDI2000 JTAG tool for porting u-boot and kernel.

2. We are not able to load the u-boot or u-boot.bin file directly

to SDRAM location.

Yes, this will not work. In general "u-boot.bin" is a binary only for programming into flash. Some 4xx variants support an RAMbooting build target though (e.g. 440EPx). Please take a look at this define CONFIG_SYS_RAMBOOT. This is not ported to 440GX though at the moment.

3. When we try to load its load to the flash loaction i.e what ever we mention in the macro CONFIG_SYS_TEXT_BASE from board.h file its loads to that location and when we give go command it throws an error called JTAG instruction overrun.

4. When we build the u-boot code the file size of u-boot.bin is always created with the macro initialized by CONFIG_SYS_TEXT_BASE from the board.h file.

5. We are able to load u-boot.bin to a flash location directly but u-boot is not coming up. So to debug the u-boot we are trying to load directly to SDRAM location. VxWorks is coming up when we load directly to SDRAM location.

6. I think the u-boot is creating a u-boot.bin file to load for flash loaction. How to create an image or bin file to load on SDRAM location directly.

Please see my comment above. You either need to create a real U-Boot port for your custom 440GX board to program into flash. Or you can also port the CONFIG_SYS_RAMBOOT feature to 440GX to support RAMbooting. But this would only help for test purposes. I suggest that you port the "real" U-Boot to your board.

Thanks, Stefan