543a introduces a linker pass called --ghost_align . It detects when struct padding is wasting RAM (critical on 2KB microcontrollers) and subtly reorders members at link time without altering source. Results: average 7% RAM reduction. Risk: near-zero, because the linker validates the change across all interrupt contexts. How? No one knows. ARM’s official line: “Proprietary alignment relaxation.”
v543a is a stability- and performance-focused release with important bugfixes, better diagnostics, and smoother plugin compatibility—recommended for production users. mdkarm version 543a better
A or utility that uses this specific versioning? 543a introduces a linker pass called --ghost_align
For the uninitiated, MDKARM (Microcontroller Development Kit for ARM) is Keil’s proprietary IDE/compiler suite for ARM Cortex-M, Cortex-R, and legacy ARM7/9 cores. It’s the dusty, reliable workhorse of medical devices, automotive ECUs, and industrial robots—code that absolutely, positively cannot crash. Risk: near-zero, because the linker validates the change
: A unified environment for editing, compiling, and debugging.