Hi,
I am using Config Tools for i.MX v26.03 to train DDR3L on a custom i.MX8MM board.
The DDR training completes successfully using the tool, and I have generated the ddr3l_timing.c file.
I built U-Boot using 2019.04, and from the logs it shows that:
DDR initialization is completed
DDR configuration is applied
DDR calibration/training is successful
However, when I download the U-Boot proper image into DDR (RAM), I observe that memory contains repeated pattern values (as seen in logs), indicating that DDR write is not working correctly.
--- SDP CMD RX ---
Raw: 0b 0b 40 20
Jumping to header at 0x40200000
Header Tag is not an IMX image
Memory dump at 0000000040200000:
0x40200000: 20 20 75 75 59 59 c7 c7 8b 8b 07 07 f4 f4 d5 d5
0x40200010: ae ae 3d 3d ef ef 27 27 68 68 b0 b0 1a 1a f4 f4
0x40200020: 20 20 75 75 59 59 c7 c7 8b 8b 07 07 f4 f4 d5 d5
0x40200030: ae ae 3d 3d ef ef 27 27 68 68 b0 b0 1a 1a f4 f4
0x40200040: 20 20 75 75 59 59 c7 c7 8b 8b 07 07 f4 f4 d5 d5
I also tried building with U-Boot 2023.04, but I am facing a different issue:
U-Boot SPL 2023.04-dirty (Apr 01 2026 - 16:03:20 +0530)
CPU freq: 1200 MHz
PMIC: PCA9450AA configured for DDR3L (1.5V) and custom rails
DDRINFO: start DRAM init
DDRINFO: DRAM rate 344069MTS
At this point, the system gets stuck and does not proceed further.
So my questions are:
Which U-Boot version is recommended when using Config Tools v26.03 for DDR3L?
Is the generated ddr3l_timing.c compatible with U-Boot 2019.04, or is a newer version required?
Could this issue (successful training but DDR write failure) be due to a mismatch between tool version and U-Boot version?
Thanks.
