Do you have to have a tty interface? Or can you use the SCIF directly? For example, I wanted to print out current RAM and CPU usage in a kernel thread, but using the tty-SCIF driver from inside the kernel was too much work (you have to create a new tty layer). So, I just manually set up the SCIF. It's very easy. github.com/.../4b69cc9489d7e26c64223b0acbb0e84bb5aee339 So, you can do the same thing for SCIF + DMA. Also, I do not think XIP is your issue. Linux is not a real-time, so you need to use DMA or do everything in fast interrupt routines (or polling). Chris
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