DDR Stress test is not working and 2x32 LPDDR2 is getting detected as single channel LPDDR2

[srinivasaporam]

Hi,

We have got IMX6D board which is designed based of IMX6D reference design and only changing in memory technology. Reference design is based on DDR3 where as our board is having 2x32 LPDDR2 (Micron's MT42L128M64D2LL-25 AT:A).

When we arr running, DDrR stress test is not running completely. It is stucking in between. and also it is showing as single channel LPDDR2.

I have attached Datasheet for LPDDR2, Stress test output and script file generated for LPDDR2. Why it is giving read values as 0x1111 whereas it should give 8 values( like 0x11111111)

ABS_OFFSET=0x00000000	result[00]=0x1111
ABS_OFFSET=0x04040404	result[01]=0x1111
ABS_OFFSET=0x08080808	result[02]=0x1111
ABS_OFFSET=0x0C0C0C0C	result[03]=0x1111
ABS_OFFSET=0x10101010	result[04]=0x1111
ABS_OFFSET=0x14141414	result[05]=0x1111
ABS_OFFSET=0x18181818	result[06]=0x1111
ABS_OFFSET=0x1C1C1C1C	result[07]=0x1111
ABS_OFFSET=0x20202020	result[08]=0x1111
ABS_OFFSET=0x24242424	result[09]=0x1111
ABS_OFFSET=0x28282828	result[0A]=0x1101
ABS_OFFSET=0x2C2C2C2C	result[0B]=0x1101
ABS_OFFSET=0x30303030	result[0C]=0x1101
ABS_OFFSET=0x34343434	result[0D]=0x1100
ABS_OFFSET=0x38383838	result[0E]=0x1100
ABS_OFFSET=0x3C3C3C3C	result[0F]=0x1000
ABS_OFFSET=0x40404040	result[10]=0x0000
ABS_OFFSET=0x44444444	result[11]=0x0000

Original Attachment has been moved to: New-Text-Document.txt.zip

Original Attachment has been moved to: LPDDR2.inc.zip

[srinivasaporam]

Hi,

This has worked well. We have made boot_cfg3[4] high (EIM_A20) bit high which is required for 2x32 channel mode.

[Yuri]

Hello,

  Please create SR with schematic attcahed to the SR - I think it makes sense to

look at the scheme at first.

Regards,

Yuri.