So I'm building a uio kernel driver with buildroot, and I've gotten the driver to compile, installed it and can insmod it in the final buildroot target after booting the image with QEMU.
I'm on linux kernel version 3.14, and I followed the guide here: https://www.kernel.org/doc/htmldocs/uio-howto/userspace_driver.html And it describes the location on where the device file that should be opened by userland code as either one of two locations: /dev/uioX, with X being a number or /sys/class/uio/uioX But the each of following returns nothing: ls /dev/uio* ls /sys/class/uio/ After I compile the uio example that is provided in the linux source at source/drivers/uio/uio.c and uio_dmem_genirq.c, and insmod them, I do modprobe uio and modprobe uio_dmem_genirq and each of those return nothing. However, I do see that /sys/modules/uio and /sys/modules/uio_dmem_genirq What am I doing wrong? Or where are the respective device files that I'm supposed to use in my userland driver process? int fd = open("where is it!!?"); mmap(...., fd,..);
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