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ipu_cm_read() hangs system

Question asked by Robert Spriggs on Nov 28, 2016
Latest reply on Nov 29, 2016 by Robert Spriggs

We have a custom linux load on a Sabre-based i.MX6 board. We are trying to get video out of the DISP pads and are using the MXC IPUv3 driver. After Linux loads I can not read 0x260_0000 (IPU_CONF) or other registers in that area without the system freezing. I have tried both using devmem from the command line and reading directly from the driver (ipu_common.c in probe()) with the same results.


Our system is built from a custom build tree based on buildroot, and is NOT Android.