[U-Boot] Support required for loading U-boot on SDRAM
Stefan Roese
sr at denx.de
Tue Apr 2 10:13:29 CEST 2013
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
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