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MMDC setting in flash_header.S for SABER-SDP

Question asked by yuuki on Mar 10, 2014
Latest reply on Mar 27, 2014 by alejandrolozano

I have some questions about a MMDC setup in flash_header.S for SABER-SDP.

 

<Question 1>
For the MMDCx_MDASP setting
In flash_header.S, these are set up as follows.
- 32bit : 4Gb for CS0(2Gb DDR3 x2) => MXC_DCD_ITEM(48, MMDC_P0_BASE_ADDR + 0x040, 0x00000017)
- 64bit : 8Gb for CS0(2Gb DDR x4) => MXC_DCD_ITEM(71, MMDC_P0_BASE_ADDR + 0x040, 0x00000027)

However, according to MMDCx_MDASP field descriptions of a reference manual, the following is explained.

 

000_0000 256Mb
000_0001 512Mb
001_1111 8Gb (1GB)
011_1111 16Gb (2GB) - default
111_1111 32Gb (4GB)

 

I think that if CS0 is used 4Gb(2Gb DDR3 x2) with 32bit, MMDCx_MDASP setting is 0x0000000F.
Why is MMDCx_MDASP set as 0x00000017?


<Question 2>
For the MMDCx_MAPSR setting
In flash_header.S, these are set up as follows.
- 32bit : MXC_DCD_ITEM(58, MMDC_P0_BASE_ADDR + 0x404, 0x00011006)
- 64bit : MXC_DCD_ITEM(82, MMDC_P1_BASE_ADDR + 0x404, 0x00011006)

However, according to MMDCx_MAPSR field descriptions of a reference manual, bit19-16 and bit3-1 fields are "Reserved".

Would you teach the reason written in the Reserved domain?
Are these fields for Freescale factories?
Does the user need to write a value in these Fields?

 

Best Regards,

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