Hi Peter,
The LPC11U devices include a ROM bootloader, that could be accessed by UART in order to program the MCU without requiring a debug interface. You could refer to application note AN11229 “UUencoding for UART ISP” for additional information regarding the commands that should be send by the UART host (the i.MX in this case):
https://www.nxp.com/docs/en/application-note/AN11229.pdf
On the i.MX6 side, you could use a generic TTY port, ensuring that the application sends the proper commands for programming the LPC11, and then, using the programmed application to establish communication between MCU and MPU through UART. The following Community document implements similar TTY communication, you could use is as reference:
https://community.nxp.com/docs/DOC-331330
Hope this will be useful for you.
Best regards!
/Carlos
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