[U-Boot-Users] 440SP DDR2 Issue
I have a custom board I am trying to bring up that is a pretty close architecture to the Luan2 board. I have an unregistered 2GB DDR2 module in the DIMM slot, and it works fine using the BDI2000. However, using the same DDR2 configuration in U-Boot doesn't work. It boots up until the point it transfers over to memory. I have enabled the memory test and it fails at the first address. I have verified all of the memory configuration registers, and all seem to be set correctly. I know there is something in the configuration I am missing, but I can't seem to figure it out. Please help. I would greatly appreciate it.
Thanks, Jeff Stevens
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Hi Jeff,
On Friday 28 July 2006 19:15, Jeff Stevens wrote:
I have a custom board I am trying to bring up that is a pretty close architecture to the Luan2 board. I have an unregistered 2GB DDR2 module in the DIMM slot, and it works fine using the BDI2000.
Did you ever try a smaller module. I would start with something like 256MB. Are you aware that the MMU has to be setup for this big memory module?
However, using the same DDR2 configuration in U-Boot doesn't work. It boots up until the point it transfers over to memory. I have enabled the memory test and it fails at the first address. I have verified all of the memory configuration registers, and all seem to be set correctly. I know there is something in the configuration I am missing, but I can't seem to figure it out. Please help. I would greatly appreciate it.
First try smaller modules. If they also don't work, you most likely have a problem with your DDR2 setup.
Best regards, Stefan
On 7/28/06, Jeff Stevens jsteve17@yahoo.com wrote:
I have a custom board I am trying to bring up that is a pretty close architecture to the Luan2 board. I have an unregistered 2GB DDR2 module in the DIMM slot, and it works fine using the BDI2000. However, using the same DDR2 configuration in U-Boot doesn't work. It boots up until the point it transfers over to memory. I have enabled the memory test and it fails at the first address. I have verified all of the memory configuration registers, and all seem to be set correctly. I know there is something in the configuration I am missing, but I can't seem to figure it out. Please help. I would greatly appreciate it.
Thanks, Jeff Stevens
Sounds like your BDI-2000 configuration may be "helping" you out by initializing things for you. At least, that is what sometimes happens to me.
To get to the bottom of it, comment out every target configuration setting in your BDI-2000 config file and see if you can replicate the problem with the BDI connected. If you can't, then look elsewhere. But if you can, then your init code relies on help from the BDI. And, fortunately, you can now use your BDI to debug it.
participants (3)
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Jeff Stevens -
Peter Hanson -
Stefan Roese