Hello,
Please look at my comments below.
1.
Please refer to the following :
Board Bring-up and DDR Initialization Tools
2.
There are the echo gating output and feedback signals (EMI_DDR_OPEN and EMI_DDR_OPEN_FB),
used by the DRAM PHY to put a window around the DQS transition. They should be routed so that
length of trace from DDR_Open to DDR_Open_FB is mean ( EMI_CLK+EMI_CLKn , DQS0+DQS0n, DQS1+DQS1n ).
Some calibration procedure could help in case of EMI_DDR_OPEN and EMI_DDR_OPEN_FB signals violation,
but we do not have such code for calibration.
3.
We do not have the Stress Test for I.MX28, but the following thread contains "mem_test",
which is based on FSL / NXP codes, used for DDR stress tester of i.MX6.
Re: i.MX28 DDR stress test
The Code Sourcery (Mentor) toolchain (host – Windows, executable (.elf)
image – for bare metal) was used to build it. As I know, such release is not
available now on Mentor web. You may try other GNU compiler.
One can try to load the test via a JTAG debugger (test.elf file should be used
here) or it is possible to load and run the test (test.sb) via USB in i.MX28 recovery
mode. Please use usb_load.bat for it. Note the sources contain memory initialization
for i.MX28 EVK. Perhaps it is needed to modify initialization for specific board.
Have a great day,
Yuri
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