Dear all,
In our system, two Flashs are connected to SS0 and SS1 of ECSPI1 port.
And ECSPI Boot from SS0 is used.
We have a problem that boot fail occurs infrequently.
W6 pin is used as ECSPI1_SS1.
This W6 pin is GPIO Input 100K pull-up by default.
We checked SS pins of ECSPI.
We found that SS1 became Low at SS0 assertion.
We think that internal Pull-up is not enabled.
Is the description of the data sheet right?
Is there the method that this pin sets to the High(Pull-up) during ECSPI Boot?
May I have advice?
Best Regards,
Yuuki
Solved! Go to Solution.
Q. If CS of serial Flash be pull-downed internally, may it make this signal line Low?
A. Yes.
What is the state of this signal if it is disconnected from serial flash? What value of external pull-up did you use? Please check/report.
Best Regards,
Artur
As the i.MX6Solo Data Sheet document says, actually, this pin is configured as GPIO input with 100kOhm internal pull-up enabled at out-of-reset state. Isn't there any other external load on this pin? What happens if pulling the pin up with an external resistor? Please check.
Have a great day,
Artur
Dear Artur-san,
Thank you for a response.
The W6 pin is directly connected only in CS of serial Flash.
This signal line does not be pull-downed externally.
If CS of serial Flash be pull-downed internally, may it make this signal line Low?
When this line is pulled-up externally, it seems that boot fail does not occur.
Do we need outside pull-up to avoid the W6 pin becoming Low?
We cannot add outside Pull-up because development has been already completed.
Is there any good method for this situation?
May I have advice?
Best Regards,
Yuuki
Q. If CS of serial Flash be pull-downed internally, may it make this signal line Low?
A. Yes.
What is the state of this signal if it is disconnected from serial flash? What value of external pull-up did you use? Please check/report.
Best Regards,
Artur
Dear Artur-san,
I'm sorry.
This problem was our setting mistake.
We found W6pin having been set in Hi-z in U-Boot.
We are grateful to you for your help.
Best Regards,
Yuuki