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How do you make 4 DIMM sockets for SA6R(SH6) board?

Basically, the Intel 815E chipset only supports 6 banks(CSA #0~CSA #5) for three DIMM sockets, but we make the fourth DIMM socket by sharing the CSA #4 and CSA #5 with the third DIMM socket for flexible combination. However, since the DIMM socket 4 is designed to share two same memory control signals with DIMM socket 3, so that if you have to use DIMM socket 3 and DIMM socket 4 at the same time, you can only put one single bank SDRAM for DIMM socket 3 and DIMM socket 4, otherwise, the system will only accept the SDRAM on DIMM socket 3 and total memory size would be out of your expectation. By the way, if you do have just only one SDRAM memory module for your system, please be aware of always install it on DIMM socket 1, 2 or 3 first, or else your system will not work.