This recapitulates headless operation from last time. Not to worry, we can still use desktop Ubuntu over the network from another computer. Certainly we could have added our counters to that system, but to focus on the essentials I thought a brand new, minimalist design would be better. Notice the system we have just built from scratch does not include the nice ADI HDMI display controller. We’ve built an FSBL that sets this all up, loads the PL, and loads and launches u-boot and we’re going to reuse the same good old u-boot.elf Linux boot loader from last time. Thanks to the XPS Base System Builder Wizard, its processing system is preconfigured with support for UART, GPIO, SD card, Quad SPI, USB, Ethernet, and 512 MB of DRAM. It has a pair-of-32-bit-counters peripheral in the programmable logic. So far we’ve built a new ZedBoard project from scratch. Following part one, this is the second half of a two part tutorial series on how access a memory-mapped device implemented in Zynq’s programmable logic fabric.
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