Jacek Maksymowicz developed and maintained core platform features for Phoenix-RTOS, focusing on cross-platform kernel, HAL, and device driver support in repositories such as phoenix-rtos-kernel and phoenix-rtos-devices. He engineered architecture bring-up for ARMv8-M, AArch64, and ARMv7-R, implementing memory protection, cache management, and hardware abstraction layers in C and Assembly. Jacek refactored drivers for UART, SPI, and flash, enabling robust peripheral integration and dynamic configuration across STM32, ZynqMP, and TDA4VM platforms. His work emphasized reliability, portability, and performance, delivering secure memory isolation, efficient DMA, and precise timing infrastructure, resulting in maintainable, scalable embedded systems for diverse hardware targets.
October 2025 performance summary for phoenix-rtos development: Delivered robust ARMv8-M platform improvements across kernel, HAL, and build tooling. Focused on cache correctness, FPU enablement, timing infrastructure, MPU robustness, and cross-platform memory management. These changes enhance performance, reliability, and configurability on STM32-based platforms, reduce hangs and timing jitter, and lay groundwork for future kernel features.
October 2025 performance summary for phoenix-rtos development: Delivered robust ARMv8-M platform improvements across kernel, HAL, and build tooling. Focused on cache correctness, FPU enablement, timing infrastructure, MPU robustness, and cross-platform memory management. These changes enhance performance, reliability, and configurability on STM32-based platforms, reduce hangs and timing jitter, and lay groundwork for future kernel features.
September 2025 monthly summary focusing on developer accomplishments and business value in the Phoenix-RTOS projects. Highlights this month include security and reliability enhancements on STM32 ARMv8-M platforms, improved memory protection and resource isolation, enhanced hardware clock flexibility, and performance-oriented DMA features. Deliverables span kernel, devices, and platform layers, with concrete commit references captured for traceability and review. Key achievements and business value: - Strengthened security and isolation for STM32-based MCUs by adding RIMC configuration CID support, RISAF region management, and cache management improvements, reducing risk of cross-domain access and data leakage. (Kernel: commits 14a46f92971f87523bfeb81229defe7bd39c155d; 74b81465a0cb3ba5ac5846aa0dcbeb9cdcb6fb0c; 1ad2c0b060d8a066ed394bc8cf4465cb8c87a58c; tie-ins: RISAF, RIMC, cache) - Improved DMA throughput and security posture through platform-controlled DMA permissions, exposing secure/privileged/lock states to software, enabling safer inter-module communication. (Kernel: 2c127d58a1c3242259a02866b1b3ce4797448a39) - Enabled robust clock handling and platform flexibility by adding an optional internal clock operation mode (disable HSE) and reporting benefits for clock-related calculations, reducing dependency on external oscillators in constrained deployments. (Kernel: 36f338fbe14288b39d02c65bde31f89cdc8c449c; HAL flags combined with N6 clock mode) - Expanded hardware platform coverage with DMA for STM32N6 on STM32L4-Multi, increasing SPI throughput for high-bandwidth peripherals and improving overall system performance. (Devices: 316856ac87cfa0db739a174607b1ea6ed3d6fa05) - Strengthened device support with HAL robustness improvements and MT35X flash support, enabling new storage options and more reliable flash operations under varied workloads. (PLO: 191cebec0cb80661dfee3b2f87b256c225737541; cf340e8c6917d1239a0445dd97fcd30b6df22a40) Top 3-5 achievements: 1) RIMC/CID support and RISAF-based memory protection for STM32 ARMv8-M (security, isolation, and reliability). 2) DMA security exposure via platformctl and cache management enhancements for data integrity. 3) Clock flexibility improvements enabling internal clock operation and optimized peripheral timing. 4) DMA SPI support for STM32N6 on stm32l4-multi and MT35X Flash driver extension for new storage chip. 5) HAL robustness improvements across STM32N6, improving stability and boot-time reliability.
September 2025 monthly summary focusing on developer accomplishments and business value in the Phoenix-RTOS projects. Highlights this month include security and reliability enhancements on STM32 ARMv8-M platforms, improved memory protection and resource isolation, enhanced hardware clock flexibility, and performance-oriented DMA features. Deliverables span kernel, devices, and platform layers, with concrete commit references captured for traceability and review. Key achievements and business value: - Strengthened security and isolation for STM32-based MCUs by adding RIMC configuration CID support, RISAF region management, and cache management improvements, reducing risk of cross-domain access and data leakage. (Kernel: commits 14a46f92971f87523bfeb81229defe7bd39c155d; 74b81465a0cb3ba5ac5846aa0dcbeb9cdcb6fb0c; 1ad2c0b060d8a066ed394bc8cf4465cb8c87a58c; tie-ins: RISAF, RIMC, cache) - Improved DMA throughput and security posture through platform-controlled DMA permissions, exposing secure/privileged/lock states to software, enabling safer inter-module communication. (Kernel: 2c127d58a1c3242259a02866b1b3ce4797448a39) - Enabled robust clock handling and platform flexibility by adding an optional internal clock operation mode (disable HSE) and reporting benefits for clock-related calculations, reducing dependency on external oscillators in constrained deployments. (Kernel: 36f338fbe14288b39d02c65bde31f89cdc8c449c; HAL flags combined with N6 clock mode) - Expanded hardware platform coverage with DMA for STM32N6 on STM32L4-Multi, increasing SPI throughput for high-bandwidth peripherals and improving overall system performance. (Devices: 316856ac87cfa0db739a174607b1ea6ed3d6fa05) - Strengthened device support with HAL robustness improvements and MT35X flash support, enabling new storage options and more reliable flash operations under varied workloads. (PLO: 191cebec0cb80661dfee3b2f87b256c225737541; cf340e8c6917d1239a0445dd97fcd30b6df22a40) Top 3-5 achievements: 1) RIMC/CID support and RISAF-based memory protection for STM32 ARMv8-M (security, isolation, and reliability). 2) DMA security exposure via platformctl and cache management enhancements for data integrity. 3) Clock flexibility improvements enabling internal clock operation and optimized peripheral timing. 4) DMA SPI support for STM32N6 on stm32l4-multi and MT35X Flash driver extension for new storage chip. 5) HAL robustness improvements across STM32N6, improving stability and boot-time reliability.
Month: 2025-08 In August 2025, delivered key hardware support and safety improvements in phoenix-rtos-devices. Introduced a new armv8m55-stm32n6 target configuration with a Makefile default component set, broadening hardware configurations supported by Phoenix-RTOS. Implemented a comprehensive safety upgrade in stm32l4-multi driver: fixed array bounds checks, removed a problematic compiler flag from the Makefile, and switched I2C, SPI, TTY, and UART drivers to robust dynamic sizing based on active peripherals, yielding safer, more reliable peripheral management. These changes improve platform safety, expand market-ready configurations, and reduce maintenance burden for drivers. Demonstrated proficiency in C, embedded build systems, and driver safety patterns; increased business value by enabling new hardware support and more robust deployments.
Month: 2025-08 In August 2025, delivered key hardware support and safety improvements in phoenix-rtos-devices. Introduced a new armv8m55-stm32n6 target configuration with a Makefile default component set, broadening hardware configurations supported by Phoenix-RTOS. Implemented a comprehensive safety upgrade in stm32l4-multi driver: fixed array bounds checks, removed a problematic compiler flag from the Makefile, and switched I2C, SPI, TTY, and UART drivers to robust dynamic sizing based on active peripherals, yielding safer, more reliable peripheral management. These changes improve platform safety, expand market-ready configurations, and reduce maintenance burden for drivers. Demonstrated proficiency in C, embedded build systems, and driver safety patterns; increased business value by enabling new hardware support and more robust deployments.
July 2025 monthly summary focused on delivering platform expansion, reliability improvements, and cross-target portability for Phoenix RTOS. The team completed major platform support and peripheral integration, enhanced timing/diagnostics, and refined configuration and portability to reduce maintenance. Key outcomes: - Expanded hardware support in kernel: STM32N6 platform added to the ARMv8-M HAL with hardening of interrupt handling and new drivers for BSEC and RIFSC to enable privileged hardware access. - Timing and diagnostics improvements: Implemented SysTick count retrieval with overflow handling and enhanced exception diagnostics to improve debugging and timing reliability. - TI/TDA4VM platform enablement: Ported to the TDA4VM CPU by bringing up the ARMv7-R HAL, including platform Makefiles, init code, console drivers, interrupts, timers, and register definitions to enable boot on TI-based systems. - STM32N6 peripheral support in devices: Added RCC, SPI, ADC, EXTI drivers, and clock tree runtime frequency determination with a dummy DMA path and FIFO optimizations for STM32N6 peripherals. - Console/configuration and portability refinements: Renamed UART_CONSOLE to UART_CONSOLE_USER for user-configurable consoles, introduced ISEMPTY macro, and completed a portability refactor of the stm32l4-multi driver to improve cross-target compatibility and maintainability. Business value delivered: - Broadened hardware compatibility (STM32N6 and TI platforms) enabling customers to deploy Phoenix RTOS on more MCU families. - Improved system reliability and debuggability through better timing measurements and richer exception diagnostics. - Reduced maintenance burden via modular drivers, clearer configuration semantics, and portable driver code across targets.
July 2025 monthly summary focused on delivering platform expansion, reliability improvements, and cross-target portability for Phoenix RTOS. The team completed major platform support and peripheral integration, enhanced timing/diagnostics, and refined configuration and portability to reduce maintenance. Key outcomes: - Expanded hardware support in kernel: STM32N6 platform added to the ARMv8-M HAL with hardening of interrupt handling and new drivers for BSEC and RIFSC to enable privileged hardware access. - Timing and diagnostics improvements: Implemented SysTick count retrieval with overflow handling and enhanced exception diagnostics to improve debugging and timing reliability. - TI/TDA4VM platform enablement: Ported to the TDA4VM CPU by bringing up the ARMv7-R HAL, including platform Makefiles, init code, console drivers, interrupts, timers, and register definitions to enable boot on TI-based systems. - STM32N6 peripheral support in devices: Added RCC, SPI, ADC, EXTI drivers, and clock tree runtime frequency determination with a dummy DMA path and FIFO optimizations for STM32N6 peripherals. - Console/configuration and portability refinements: Renamed UART_CONSOLE to UART_CONSOLE_USER for user-configurable consoles, introduced ISEMPTY macro, and completed a portability refactor of the stm32l4-multi driver to improve cross-target compatibility and maintainability. Business value delivered: - Broadened hardware compatibility (STM32N6 and TI platforms) enabling customers to deploy Phoenix RTOS on more MCU families. - Improved system reliability and debuggability through better timing measurements and richer exception diagnostics. - Reduced maintenance burden via modular drivers, clearer configuration semantics, and portable driver code across targets.
June 2025 — No major bugs reported. Focused on feature delivery and platform expansion across Phoenix-RTOS repositories. Delivered cross-platform drivers and new hardware targets to enable STM32N6 support, improve storage capabilities, and streamline maintenance and reuse.
June 2025 — No major bugs reported. Focused on feature delivery and platform expansion across Phoenix-RTOS repositories. Delivered cross-platform drivers and new hardware targets to enable STM32N6 support, improve storage capabilities, and streamline maintenance and reuse.
May 2025 monthly summary highlighting delivery across Phoenix-RTOS repos, with a focus on stability, platform expansion, and startup efficiency.
May 2025 monthly summary highlighting delivery across Phoenix-RTOS repos, with a focus on stability, platform expansion, and startup efficiency.
April 2025 monthly summary for Phoenix-RTOS development focused on delivering hardware readiness, performance instrumentation, and reliability improvements across multiple repos, with a clear emphasis on business value and platform stability. Key features delivered and major improvements: - HAL: Added CPU cycle counter API (hal_getCycleCount) and enabled cycle counter in ARMv7r HAL, enabling precise performance timing and profiling across targets. - UART driver: Implemented hardware-dependent baud rate calibration and safe interrupt setup, replacing fixed divisors with hardware-aware calculations for reliable communication across variants. - TDA4VM readiness: Expanded target support across core components. libphoenix gained TDA4VM reboot handling via conditional include in reboot.c. UART16550 gained TDA4VM target support with HAL, base addresses, IRQs, and initialization logic across devices. - UART16550 reliability: Refactored interrupt handling with a software receive buffer in the main thread and improved IRQ management, improving reliability and cross-UART support. - Build system and target expansion: Added armv7r5f-tda4vm target in phoenix-rtos-build to streamline cross-compilation and deployment for the new hardware. - Memory protection safety: Implemented MPU disable control and startup safeguards for ARMv7-R to ensure consistent memory access during startup and protect against MPU misconfigurations. Overall impact and business value: - Accelerates support for new hardware (TDA4VM) and broader deployment scenarios with a single build and clear runtime instrumentation. - Improves reliability of critical subsystems (UART, memory protection) and enables accurate performance measurement for profiling and optimization. - Demonstrates cross-repo collaboration and modern hardware support with consistent HAL/driver interfaces and target configurations. Technologies and skills demonstrated: - ARMv7-R architecture specifics (MPU handling, cycle counter, HAL integration). - UART subsystem design and safe interrupt architectures across multiple UART implementations. - Cross-target development, HAL/PLL integration, and build-system extensibility for new hardware targets (TDA4VM). - Reboot/platform-specific handling for new targets and robust startup sequencing.
April 2025 monthly summary for Phoenix-RTOS development focused on delivering hardware readiness, performance instrumentation, and reliability improvements across multiple repos, with a clear emphasis on business value and platform stability. Key features delivered and major improvements: - HAL: Added CPU cycle counter API (hal_getCycleCount) and enabled cycle counter in ARMv7r HAL, enabling precise performance timing and profiling across targets. - UART driver: Implemented hardware-dependent baud rate calibration and safe interrupt setup, replacing fixed divisors with hardware-aware calculations for reliable communication across variants. - TDA4VM readiness: Expanded target support across core components. libphoenix gained TDA4VM reboot handling via conditional include in reboot.c. UART16550 gained TDA4VM target support with HAL, base addresses, IRQs, and initialization logic across devices. - UART16550 reliability: Refactored interrupt handling with a software receive buffer in the main thread and improved IRQ management, improving reliability and cross-UART support. - Build system and target expansion: Added armv7r5f-tda4vm target in phoenix-rtos-build to streamline cross-compilation and deployment for the new hardware. - Memory protection safety: Implemented MPU disable control and startup safeguards for ARMv7-R to ensure consistent memory access during startup and protect against MPU misconfigurations. Overall impact and business value: - Accelerates support for new hardware (TDA4VM) and broader deployment scenarios with a single build and clear runtime instrumentation. - Improves reliability of critical subsystems (UART, memory protection) and enables accurate performance measurement for profiling and optimization. - Demonstrates cross-repo collaboration and modern hardware support with consistent HAL/driver interfaces and target configurations. Technologies and skills demonstrated: - ARMv7-R architecture specifics (MPU handling, cycle counter, HAL integration). - UART subsystem design and safe interrupt architectures across multiple UART implementations. - Cross-target development, HAL/PLL integration, and build-system extensibility for new hardware targets (TDA4VM). - Reboot/platform-specific handling for new targets and robust startup sequencing.
March 2025 performance summary for the Phoenix-RTOS program, focusing on expanding hardware support, strengthening security, and improving build and maintenance efficiency across multiple repositories. Key platform, kernel, and tooling work delivered this month enabled broader market reach, faster onboarding for embedded deployments, and more robust operation on complex ZynqMP-based platforms.
March 2025 performance summary for the Phoenix-RTOS program, focusing on expanding hardware support, strengthening security, and improving build and maintenance efficiency across multiple repositories. Key platform, kernel, and tooling work delivered this month enabled broader market reach, faster onboarding for embedded deployments, and more robust operation on complex ZynqMP-based platforms.
February 2025 (phoenix-rtos/plo): Delivered two security/hardware integration features with direct business impact: - Secure EL3 access in AArch64 HAL: Enable running PLO at EL3 for secure access, adjusting system register accesses from EL1 to EL3, enabling direct access to secure hardware without a separate secure monitor. Commit: 23a02cb3eb8d37cff0fd3c736272171493555cf5. - ZynqMP PL bitstream loading via PCAP and DMA: Implement PCAP interface and DMA-based bitstream loading for ZynqMP SoCs, managing power, reset, and data transfer for automated PL configuration. Commit: 89a0f3a02768c4d6aa81a74345c735521c93d237. Note: No critical bugs reported this period; focus was on feature delivery and platform bring-up.
February 2025 (phoenix-rtos/plo): Delivered two security/hardware integration features with direct business impact: - Secure EL3 access in AArch64 HAL: Enable running PLO at EL3 for secure access, adjusting system register accesses from EL1 to EL3, enabling direct access to secure hardware without a separate secure monitor. Commit: 23a02cb3eb8d37cff0fd3c736272171493555cf5. - ZynqMP PL bitstream loading via PCAP and DMA: Implement PCAP interface and DMA-based bitstream loading for ZynqMP SoCs, managing power, reset, and data transfer for automated PL configuration. Commit: 89a0f3a02768c4d6aa81a74345c735521c93d237. Note: No critical bugs reported this period; focus was on feature delivery and platform bring-up.
January 2025: Delivered performance and stability improvements across three Phoenix-RTOS repositories. Implemented AArch64 hardware-accelerated FP math functions in libphoenix using FPU instructions, increased the usrv thread stack size on AArch64 in the kernel for reliability, hardened page initialization boundary checks to prevent buffer overruns, and added a boot layout script for ZynqMP to streamline boot image assembly for QSPI/BOOT.BIN.
January 2025: Delivered performance and stability improvements across three Phoenix-RTOS repositories. Implemented AArch64 hardware-accelerated FP math functions in libphoenix using FPU instructions, increased the usrv thread stack size on AArch64 in the kernel for reliability, hardened page initialization boundary checks to prevent buffer overruns, and added a boot layout script for ZynqMP to streamline boot image assembly for QSPI/BOOT.BIN.
December 2024 monthly summary for phoenix-rtos-devices: Delivered cross-platform driver compatibility enabling ZynqMP support for UART and Flash peripherals. Consolidated support for Zynq7000 and ZynqMP with new configurations and conditional compilation to harmonize hardware addresses, interrupts, and clock/reset handling, enabling a single driver to cover both platforms and reducing code duplication. The change lays the foundation for easier onboarding of additional platforms and faster integration of new peripherals.
December 2024 monthly summary for phoenix-rtos-devices: Delivered cross-platform driver compatibility enabling ZynqMP support for UART and Flash peripherals. Consolidated support for Zynq7000 and ZynqMP with new configurations and conditional compilation to harmonize hardware addresses, interrupts, and clock/reset handling, enabling a single driver to cover both platforms and reducing code duplication. The change lays the foundation for easier onboarding of additional platforms and faster integration of new peripherals.
Concise monthly summary for 2024-11 highlighting delivered features and fixes across Phoenix-RTOS repos. Emphasis on RAM-constrained target support, cross-variant platform enablement, 64-bit compatibility, and platform-specific enhancements that improve maintainability and time-to-market.
Concise monthly summary for 2024-11 highlighting delivered features and fixes across Phoenix-RTOS repos. Emphasis on RAM-constrained target support, cross-variant platform enablement, 64-bit compatibility, and platform-specific enhancements that improve maintainability and time-to-market.
2024-10 Monthly Summary: Completed cross-repo AArch64/ZynqMP architecture enablement across kernel, library, and build system, establishing the foundation for Phoenix-RTOS on AArch64-based ZynqMP devices. The work delivers initial toolchain integration, architecture support, and HAL/core components to enable porting and early validation.
2024-10 Monthly Summary: Completed cross-repo AArch64/ZynqMP architecture enablement across kernel, library, and build system, establishing the foundation for Phoenix-RTOS on AArch64-based ZynqMP devices. The work delivers initial toolchain integration, architecture support, and HAL/core components to enable porting and early validation.
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