Hello,
Greeting.
I have developed a customed IM6 Dual board with 2GB DRAM(4 pieces MT41K256M16TW-107IT:P DDR3 chips by Micron).After configurating the DDR parameter,we tried DDR Stress test using DDR Stress test Tool V1.03 .The configuration progress stucked after starting DQS gating calibration,and the calibration didn't go any further.And it didn't report any "ERROR ".We also tried connecting the board with PC using a USB cabel ,the “MsgTools” can find a device,but can't load the Uboot. We had reviewed the hardware design by "Check List".
Does anyone have any idea what I could be doing wrong or give me some suggestion? Thanks in advance for any help.
Hi 许
please look at suggestions ptovided on similar issue in
DDR3 configuration for imx6q processor
Best regards
igor
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Hi igorpadykov
Thank you for your advice.I have re-check my schematic files.I find THE "USB_H1_VBUS" pin is left unconnected. And the voltage of pin "VDDUSB_CAP" is just 1.5V. We havn't use the "USB Host " function.The "USB_H1_DP" pin and "USB_H1_DN"pin are also left unconnected. Do u think it's relevant to my problem.
Thanks again.
Best regards
Xu Lei
USB_H_VBUS or USB_OTG_VBUS should be powered for having
correct VDD_VBUS_CAP, according to Figure 50-1. Power system overview i.MX6DQ RM
http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf
Best regards
igor
Oh my.What can i do to save this board? Is there any other way to load the uboot fils into the IMX6 processor,like JTag.Can u give me some advice.
Thanks again for your enduring reply.
Best regards
Xu Lei
yes it is possible to load the uboot with jtag, please check AN5229
https://www.nxp.com/docs/en/application-note/AN5229.pdf
Best regards
igor
Problem solved。It was the PCB soldering issue.Thanks anyway.
Hi Xu
yes if voltage of pin "VDDUSB_CAP" is just 1.5V then it may cause that
MfgTool can't load the Uboot.
Best regards
igor
Hi igorpadykov
But does the pin "USB_H1_VBUS" must be connected to a 5V voltage even we don't use the "USB Host " function?
Best regards
Xu Lei