[U-Boot-Users] u-boot debug suggestions
Hi,
I have a custom board running a 405GPr that is based off of the walnut ref board with the exception that we have a 512KB boot prom starting @ fff80000 which is where I burn uboot. I have ported u- boot-1.1.3 to the board with the assistance of a BDI2000 which seems to work well. I get the uboot UI and am able to read and write to sdram and flash, however if I remove the jtag uboot crashes at startup. My first thought was that it's a timing issue as the jtag would hold the board in reset on power up. I questioned this when I discovered that I can somewhat simulate this with the BDI2000 by issuing a reset run 1000. This approach would seem to indicate that it is crashing when attempting to access an sdram address. What I don't understand is why there would be a difference with the sdram initialization between powering up the target and issuing a bdi >go and issuing a >reset run xxxx? Any suggestions you have would be greatly appreciated!
thanks,
Don Pruitt
In message DA75F432-477C-4145-B022-FDCCA1A5C6BE@alltel.net you wrote:
discovered that I can somewhat simulate this with the BDI2000 by issuing a reset run 1000. This approach would seem to indicate that it is crashing when attempting to access an sdram address. What I
No, not at all. "Reset run" just skips all the statements in the init section of the BDI2000 config file. It seems that one of more of them are vital for successfully booting U-Boot on your board, and that these are missing / different in your port of U-Boot.
don't understand is why there would be a difference with the sdram initialization between powering up the target and issuing a bdi >go and issuing a >reset run xxxx? Any suggestions you have would be greatly appreciated!
I really cannot follow you why you think this has anything to do with the SDRAM initialization; it can be any other part of the init sequence as well. Check your init section in the BDI config file, and remove it step by step, and you will soon see what's missing / wrong.
Best regards,
Wolfgang Denk
Hi Don,
On Sunday 20 November 2005 21:51, Don Pruitt wrote:
I have a custom board running a 405GPr that is based off of the walnut ref board with the exception that we have a 512KB boot prom starting @ fff80000 which is where I burn uboot. I have ported u- boot-1.1.3 to the board with the assistance of a BDI2000 which seems to work well. I get the uboot UI and am able to read and write to sdram and flash, however if I remove the jtag uboot crashes at startup.
Where excatly does it crash? Please send a bootlog.
What SDRAM configuration do you use? Do you have a DIMM module on your board and use the spd_sdram code. Or do you use hardcoded SDRAM init values?
Best regards, Stefan
participants (3)
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Don Pruitt -
Stefan Roese -
Wolfgang Denk