Gpmc

Have you fought with GPMC timing lately? Keep a logic analyzer handy and always double-check your gpmc,clk-activation-ns values.

If you are designing a system that requires bridging the gap between an ARM CPU and high-speed parallel hardware, master the GPMC. It is complex, it is finicky, but once you dial in those timing registers, it becomes an invisible, zero-wait-state extension of your CPU core. Have you fought with GPMC timing lately

&gpmc { ranges = <0 0 0x08000000 0x01000000>; // CS0 at 0x08000000, 16MB nor_flash@0,0 { compatible = "cfi-flash"; reg = <0 0 0x01000000>; bank-width = <2>; // 16-bit (2 bytes) gpmc,device-width = <2>; It is complex, it is finicky, but once

In the world of embedded Linux and high-performance microcontrollers, interfacing with external memory or peripheral chips often feels like a battle against timing constraints. Enter the GPMC (General Purpose Memory Controller). While it might not be as flashy as a GPU or as talked about as a PCIe bus, the GPMC is one of the most versatile and powerful peripherals found on Texas Instruments’ Sitara processors (like the AM335x, AM437x) and OMAP platforms. While it might not be as flashy as