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Address mapping of IMX6 memory space to external RAM

Question asked by Muhammad Hamza Farooq on Mar 28, 2014
Latest reply on Mar 31, 2014 by Muhammad Hamza Farooq

Hello all,

 

I am using IMX6 SDK with the same RAM configuration as Sabre Ai board (i.e. 4 DDR IC's in x64 mode having 4 GBits capacity each). Each IC has 10 coulumns, 15 rows and 8 banks to store 16-bit words in each location. I am having trouble mapping this address space to the virtual address space as seen by the IMX6 (3840 MBytes ranging from 0x10000000 to 0xFFFFFFFF).

 

From "Table 44-4. Address decoding - bank interleaving off" of the IMX6 reference manual, I have found out the mapping for x32 system but even it has a little confusion. The 3 bits to address banks A[29:27] have initial value 3'b010 since RAM address range is starting from 0x10000000. How does this map to the zeroth bank? and how are all 8 banks accessed with this configuration?

 

Any help in this regard will be highly appreciated.

 

Hamza

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