Hi Wolfgang,
On 05/05/2011 09:24 PM, Wolfgang Denk wrote:
Dear York Sun,
In message1304602168.21927.16.camel@oslab-l1 you wrote:
I don't think get_ram_size works for your case. If you want to test the
You are wrong. We have been doing this for a long time on many boards with similar properties.
DDR to find the correct size, you have to initialize the DDR first. But you cannot do this correctly without knowing the number of banks. You may be able to blindly set the bank number and test the DDR to catch the
Incorrect number of banks will give different results than correct number, so try both. The correct configuration is simply the one that gives the maximum total memory size.
I'm trying to do that, but get the same wrong memory size in both cases. On the other hand, if I program the correct number of banks from the start, get_ram_size() returns the correct size in both cases.
The closest example of using get_ram_size() I've found is for MPC8548 TQM boards. But all these boards have 4-bank memory devices, so I'm sure my case was tested. Don't you think there can be a problem with reprogramming bank number in this particular DDR controller ?
Felix.