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Demystifying the Cortex-M Boot Sequence: What Happens Before main()

Demystify the ARM Cortex-M bare-metal startup sequence and learn exactly what happens before main() executes. This production-focused technical guide covers vector table initialization at 0x08000000, writing a custom Reset_Handler, zeroing out the .bss section, copying .data from Flash to RAM using linker symbols (_sidata, _sdata), and configuring clock trees via SystemInit(). Eliminate silent startup crashes and uninitialized variable bugs with full C startup code and linker script templates.

Embedded Systems

Zephyr OS

Microcontroller

FreeRTOS

Mastering Zephyr RTOS Userspace: Hardware-Enforced Memory Protection on Cortex-M

Learn how to implement hardware-enforced memory protection in embedded firmware using Zephyr RTOS Userspace (CONFIG_USERSPACE). This deep dive covers the Cortex-M Memory Protection Unit (MPU), creating isolated memory domains and partitions (k_mem_domain), and securing unprivileged threads via the Supervisor Call (SVC) syscall gate. Stop silent pointer corruption and catch firmware bugs immediately at the hardware level with production-ready configuration and C code examples for ARM architecture.

Embedded Systems

FreeRTOS

Zephyr OS

Beyond FreeRTOS: Mastering Zephyr's Advanced IPC Toolkit (zbus, Pipes, and Poll)

Stop building IPC workarounds. Discover how Zephyr RTOS native primitives like condition variables, pipes, the Poll API, and the zbus pub-sub model solve complex embedded communication patterns.

Embedded Systems

Linux

Linux Kernel Memory: Why Direct User Buffer Access is Dangerous (and How to Fix It)

Learn why user space buffers are unsafe for direct Linux kernel or DMA access. Understand virtual memory rules, page faults, copy_from_user, pin_user_pages, and cache coherency in Linux device drivers.

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Our blog: useful articles and resources

Demystifying the Cortex-M Boot Sequence: What Happens Before main()

Mastering Zephyr RTOS Userspace: Hardware-Enforced Memory Protection on Cortex-M

Beyond FreeRTOS: Mastering Zephyr's Advanced IPC Toolkit (zbus, Pipes, and Poll)

Linux Kernel Memory: Why Direct User Buffer Access is Dangerous (and How to Fix It)

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