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imx6sx: uart6 and rpmsg issue

Question asked by Angelo Dureghello on May 27, 2020
Latest reply on May 29, 2020 by Angelo Dureghello

Hi all,


i am on a simple busybox-based  rootfs, 4.14 imx-2.0.0 kernel, and observing a strange issue:


by a simple bash script, i am performing a simple read / write test from uart2 to uart6, and just after i perform a rpmsg m4 r/w test using the endpoint driver (ept created by echo 1 > /sys/class/rpmsg/channel_1/ept_new), after repeating 4 time the test, rpmsg channel read / write test hangs blocking execution, can exit by CTRL-.Z only and by ps i see rpmsg test process in R state.


If i remove the test on uart6, test uart2 to 5 + rpmsg works fine forever in a loop.

So seems uart6 has some special connection with rpmsg.

Also, in the imx6sx rm, after "Table 65-6. UART5 External Signals"  i don't see any uart6 table, and this make me think uart6 is someway special.

I am going deeper, but if any help, welcome.