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[mpamis]

mpamis

mpamis

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Hello,

I am trying to develop an application where the board is driving devices using both UART1 and UART2 ports. However, almost always whenever the board is booted with an attached device on port UART1 it won't start (i.e., it will not enter Redboot). If I power on the device only a couple of seconds after I have powered on the board the board will boot normally. I went through your documents and some of EP9302's documentation, but I don't seem to be able to find a solution. I believe that the problem is caused by some bug/feature of Redboot. Are you aware of what might be causing the problem and/or any workarounds?

[admin]

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The UART1 is used as default console by the Redboot and Linux.  The Redboot will stop the auto-script if it received CTRL-C character before the script is run.  Maybe the external device you connected to responded to the Redboot output and in turn stopped the Redboot executing the script.  The Redboot can be modified to not output anything to the UART1 and not respond to inputs from UART1.  You can also modify the Linux source code to not send anything the UART1.  The Redboot source code is available at http://arm.cirrus.com.