Gpmc Exclusive < 2026 Release >

The magic of the GPMC lies in its timing parameters. You can define:

The GPMC is the unsung hero of industrial embedded systems. In an era of high-speed serial interfaces, the parallel memory controller remains relevant because of its deterministic latency, raw bandwidth, and ability to memory-map custom FPGA logic. The magic of the GPMC lies in its timing parameters

// Timing (values in nanoseconds or cycles) gpmc,sync-clk-ps = <10000>; gpmc,cs-on-ns = <0>; gpmc,cs-rd-off-ns = <60>; gpmc,cs-wr-off-ns = <60>; gpmc,oe-on-ns = <10>; gpmc,oe-off-ns = <50>; gpmc,we-on-ns = <10>; gpmc,we-off-ns = <50>; gpmc,adv-on-ns = <0>; gpmc,adv-rd-off-ns = <10>; gpmc,adv-wr-off-ns = <10>; }; // Timing (values in nanoseconds or cycles) gpmc,sync-clk-ps

This allows you to interface with vintage slow ROMs (300ns access time) or high-speed FPGAs (10ns access time) on the same bus, just using different chip selects. sync-clk-ps = &lt

To access GPMC, follow these steps:

A mistake in the GPMC configuration usually results in a hard system lockup or bus errors. The Linux kernel's gpmc.c driver provides a Device Tree interface (OMAP GPMC bindings), but debugging timing issues remains a black art.