[uClinux-dev] Re: uclinux with RAM size problem

[will]

Hi Tao,

I used a modified dBUG as my bootloader and I have used the 'mm' and 'md' commands to test my memory.

The test result was just fine when I modified and read the very border of the 64M memory. I am confused and the hardware designer is

unreachable now. I port the kernel to the platform just according to the circuit diagram. Can you give me any suggestion?

Thans!

BR,

Will Huang

> Hi, Mr. Huang, > I think you don't need to set the CS in kernel. As for the SDRAM, it is not easy to make it work, so first, I think you'd better check the problem in your bootloader, some bootloaders such as u-boot can do memory write and read, so you can use these operations to check if the SDRAM on board can be accessed properly. If not, the problem is in your bootloader, so you may need to ask the hardware engineer, what is parameters of SDRAM, and then how to initialize it to work properly. > In summay, testing the SDRAM from bootloader if possible, then when it is passed the test, starting you kernel load and boot. > Good luck to you.

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