Micro Z custom driver

Hello,

I wish to write a C program in pulsar linux and communicate with my VHDL module in PL side.

I believe that I need to provide a driver for Amba AXI bus. I already watched the videos about linux device driver for the Z board, but it doesnt explain how is the patch written.It just generate a .ko file from the provided patch. Is there any tutorial to guide me how to go through the device driver for MicroZ and pulsar linux?

Best regards,

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0 zedhed over 6 years ago

Hi ASI,

When your VHDL is attached as an AXI peripheral to the AMBA interface, you can access the registers as a piece of memory space. However, to access physical memory space under Linux, you either need to MMAP() into the PL memory space or, as you suggested, (and the best option in terms of system safety) to access physical memory space from a device driver.

The patch you reference simply implements the code within the kernel source tree needed to build the drive driver that gets built into the .ko module. There are lots of resources (several books) out there that are written to help people understand how to write a device driver.

Here is some additional information from the Xilinx forum on device drivers:

https://forums.xilinx.com/t5/Embedded-Linux/Create-a-Linux-Driver-for-a-custom-IP-on-Zynq/td-p/477628

Best Regards,

-Kevin
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0 zedhed over 6 years ago

Hi ASI,

When your VHDL is attached as an AXI peripheral to the AMBA interface, you can access the registers as a piece of memory space. However, to access physical memory space under Linux, you either need to MMAP() into the PL memory space or, as you suggested, (and the best option in terms of system safety) to access physical memory space from a device driver.

The patch you reference simply implements the code within the kernel source tree needed to build the drive driver that gets built into the .ko module. There are lots of resources (several books) out there that are written to help people understand how to write a device driver.

Here is some additional information from the Xilinx forum on device drivers:

https://forums.xilinx.com/t5/Embedded-Linux/Create-a-Linux-Driver-for-a-custom-IP-on-Zynq/td-p/477628

Best Regards,

-Kevin
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