Re: external sdram and gdb tool

Hi Ryan, 

I tried to connect with ppcconnect to the board, and then i downloaded
the program. Then I started the processor and the program worked.

ppcconnect
dow ppc405_0/code/executable.elf
con

Correct me if I am wrong, but is this what the bootloader should do ?
Could you be more specific about the bootloader?

Thanks, 

Tom


On Wed, 26 Nov 2003 10:01:29 -0700, Ryan Laity
<[EMAIL PROTECTED]> wrote:

>Hi Tom,
>
>How are you populating the SDRAM with your .elf file when not using the 
>debugger? Perhaps you're doing this properly, but you didn't mention it 
>here so I have to ask.  When downloading the .bit file via iMPACT, the 
>only .elf data that you can possibly have is that in the Block RAM.  If 
>you're not moving the .elf into SDRAM then that's the problem; you will 
>need a bootloader of some sort to move the data from a static location 
>(Flash, etc.) into SDRAM.
>
>If you are already loading the .elf into SDRAM, then use the XMD tool to 
>check the validity of the .elf file in memory.  What I typically do is 
>run an object dump (either mb-objdump or powerpc-eabi-objdump) on the 
>.elf file (I typically use the -S option) and pipe that out to a text 
>file.  Next, connect to the device via XMD (ppcconnect or mbconnect) and 
>do mwr's from the base address of your SDRAM.  If you do something like 
>mwr 0xF0000000 20, it will dump the 20 addresses after 0xF0000000 
>(obviously change this to match your SDRAM base address) and you can 
>check them against the .elf file.  The boot section of the .elf is at 
>the bottom of the file so look there to start.  This will check that 
>your bootloader is doing its job properly and that your system is able 
>to read from the static location (Flash, etc.) properly (we already know 
>that it can write to SDRAM properly because it works with the debugger).
>
>I hope this information helps.  If not, please post a follow up or open 
>a case with Support.
>
>
>Ryan Laity
>Xilinx Applications
>
>
>Tom wrote:
>
>> Hi, 
>> 
>> I have some project where I store my entire program in the external
>> sdram (by redirecting every section in the linker script to the
>> sdram). When I download the program to the board, it doesn't work.
>> When I run the program in the debugger tool, it works. Does anybody
>> know an answer to this problem ?
>> 
>> regards, 
>> 
>> Tom