i.mx6sl no-boot

onoyh · ‎08-10-2019

Hi,

We are running with the following, but u-boot is not possible

Booting with micro SD card in SD1 slot

CPU：MCIMX6L3DVN10AC

DDR3L：MT41K256M16TW-107:P

The following shows the waveforms of POR_B, SD_CLK, and POR_B

Since U-BOOT is not possible, there is no UART output and DDR stress test is not possible.

Please tell me the reason why U-BOOT cannot be started and the countermeasures.

onoyh · ‎08-13-2019

Hi,Yuri

Thank you for answering

Is there a difference in the DCD value even though the USB DDR stress test has passed?

Since the DDR stress test has passed, we recognize that there is a cause between SD and i.mx.

Is there any way to isolate hardware or software?

Thanks

Yuri · ‎08-13-2019

Hello,

Yes, some differences may take place, therefore, at least check the U-boot DCD.

Use U-boot porting chapter of "i.MX_BSP_Porting_Guide.pdf".

Regards,

Yuri.

onoyh · ‎08-12-2019

Hi,Yuri

Thank you for answering

i.MX6SL DDR3 Register Programming Aid has already been applied and i.MX6 / 7 DDR Stress Test Tool V3.00 is also completed.

Could the cause be the u-boot initialization setting?

Thanks

Yuri · ‎08-12-2019

Hello,

As we can see on the oscilloscope waveforms some portion of boot data

is loaded to DRAM, which should be preliminary initialized, using the DCD.

If memory is not initialized correctly, boot issues can take place.

Regards,

Yuri.

Yuri · ‎08-11-2019

Hello,

Please check memory initialization in U-boot.

Information about it may be found in U-boot porting chapter of "i.MX_BSP_Porting_Guide.pdf".

The following resource may be helpful:

Also, try to run the DDR Stress test (JTAG or USB downloader based versions).

Have a great day,

Yuri

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