Dear Minkyu Kang,
In message 1f3430fb0911241800m5c9f4837kd90af1ab8fafd303@mail.gmail.com you wrote:
But size of a memory bank cannot be 80 MB. It must always be a power of 2.
As I said, memory bank is not 80MB.
And as I said, get_ram_size() is designed to operate on a single bank of memory only. It works only as expected when "maxsize" is a power of 2, too (also note that it is restricted to 32 bit address space, too).
The purpose is to give it the maximum possible size of memory that may be populated in one bank of memory, and test how much of this is actually there. Say you have a board where one bank of memory can be populated with 256 MB, 512 MB or 1024 MB of RAM, then you will run the test with a max size of 1024 MB and find out which of the 3 versions you have - and if there are eventually any (gross) memory errors.
So, is maxsize "maximum possible size"? or "bank size"?
maximum possible bank size.
If you mean "maximum possible size", as I mentioned.. 1Gb OneDRAM's maximum possible size is 80MB, 32MB is used by CP (can't access by AP) and 16MB is share area (used for special purposes). If you mean "bank size" then I got 64MB ram size. I don't want to get wrong size.
Could you please try to explain what this is supposed to mean?
I have no idea what "AP" or "CP" might mean, or how this is related to U-Boot or to this task. Where is U-Boot running?
If U-Boot can access 80 MB of memory, this is probably _two_ banks: one bank of 64 MB and _another_ bank of 16 MB. Which means you should test both of them, using two sepoarate calls to get_ram_size().
I just want to get memory size. When I posted SMDKC100 codes, you said "please use get_ram_size function". So, I tried it another board that uses OneDRAM. But, I can't get correct memory size. If you don't mind, I will not use this function if board uses OneDRAM.
Why not? Just use it properly, please.
This is caused by the fact that you misuse the code under conditions was not designed for. With a 80 MB region of memory, the whole theory it's function is based on does not apply. You want to use some different memory test, then (which one I don;t know, as I still fail to understand why you would want to "auto-size" 80 MB out of 1 GB of memory. This makes absolutely no sense to me.
What means "auto-size"?
"auto-size" means to automatically detect the real, currently available (= populated) size of a bank of RAM.
1GB is wrong. I said 1Gb (128 MB).
But this is NOT the size of a bank of memory that can be accessed by the CPU, right?
Best regards,
Wolfgang Denk