We are facing an issue with the DDR on our imx6d based board.
Out of the 10 boards of our first batch, one board is failing the ddr stress test. Rest all 9 boards pass the test.
We are trying to figure out the issue.
We are using two chips of the MT41K512M16HA-125:A on CS0 giving us 2GB with 32-bit data lines.
We performed stress test using ddr-test-uboot-jtag-mx6dq.bin application for Uboot.
DDR frequecies were 528MHz, 532MHz and 198MHz.
On this particular board, it even fails at 198 MHz.
The stress test fails everytime at the 0x10000000 address
=== LOG (please see attached file for entire log) ===
DDR Freq: 198 MHz
t0.1: data is addr test
Address of failure: 0x10000000
Data was: 0x10000008
But pattern should match address
Error: failed to run stress test!!!
- is it a calibration issue, layout issue, or manufacturing issue?
- can anybody please tell us where to look at to diagnose the problem?
Thanks and Regards,
Original Attachment has been moved to: ddr_log.txt.zip
Since you have 9 out of 10 boards passing and the failing board fails on the first address 0x10000000, it seems likely you have a board, build error, the expected value is 0x10000000, but returns 0x10000008, which would suggest a possible issue with DATA03.
You can also look at the HDG which offers some help with board bring-up and debugging tips.