On a dual-core ARM SOC (Zynq7020), I have Linux running on core0 and an RTOS running on core1. I share data between the two cores with a 4MB block of DDR RAM that I've marked in the MMU as shareable and non-cacheable. I use an entry in the device tree and the uio_pdrv_genirq driver to create an uio device (/dev/uio0) in Linux. With this device, I can use mmap to read/write the block of DDR RAM from Linux. Even though it's meant for memory mapped devices, the uio_pdrv_genirq driver seems to work for accessing shared DDR RAM. Are there any potential issues that may arise from using this driver for accessing shared DDR RAM? Is the uio_dmem_genirq driver more appropriate for this? I couldn't get it to work though, perhaps because of this bug: https://forums.xilinx.com/t5/Embedded-Linux/Bug-in-uio-dmem-genirq-UIO-driver-support-for-device-tree/td-p/569120 Thanks for any advice/help. Ed _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
