i.MX6LL DDR Stress Test Tool Fails

[jackjiang]

Hello all,

I'm using the DDR Stress Test tool to optimize our DDR configuration our own board. There are about 300 boards in total, three of which failed (calibration test). The log is in the attachment, can you help me confirm this fault? Thanks.

Starting DQS gating calibration

. HC_DEL=0x00000000 result[00]=0x00000010

. HC_DEL=0x00000001 result[01]=0x00000010

. HC_DEL=0x00000002 result[02]=0x00000010

. HC_DEL=0x00000003 result[03]=0x00000011

. HC_DEL=0x00000004 result[04]=0x00000011

. HC_DEL=0x00000005 result[05]=0x00000011

. HC_DEL=0x00000006 result[06]=0x00000011

. HC_DEL=0x00000007 result[07]=0x00000011

. HC_DEL=0x00000008 result[08]=0x00000011

. HC_DEL=0x00000009 result[09]=0x00000011

. HC_DEL=0x0000000A result[0A]=0x00000011

. HC_DEL=0x0000000B result[0B]=0x00000011

. HC_DEL=0x0000000C result[0C]=0x00000011

. HC_DEL=0x0000000D result[0D]=0x00000011

ERROR FOUND, we can't get suitable value !!!!

dram test fails for all values.

[igorpadykov]

Hi Jack

for DQS gating issues one can try to change drive strength of mmdc signals,

check for example description of IOMUXC_SW_PAD_CTL_GRP_B1DS register

i.MX6Q Reference Manual. For other errors one can attach jtag and

check memory signals with oscilloscope, perform simple

write/read ddr test using baremetal i.MX6Q SDK found on SMP Enable in IMX6 

example in ..src/tests/ddr_test.c

Best regards
igor
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