Month: 2026-03 Concise monthly summary focusing on key accomplishments for chipsalliance/caliptra-mcu-sw. 1) Key features delivered: - Added multi-core I3C support with a second core (i3c1) and a runtime core selection mechanism for ROM recovery and MCTP transport. Implemented memory map entries, ROM parameters, and runtime support; introduced active_i3c strap to switch between i3c0 and i3c1 at runtime. Updated ROM cold boot flow to initialize the selected core. - Updated emulator and runtime build support: generated emulator register types for i3c1, extended McuMemoryMap with i3c1 offsets/properties, and wired i3c1 through the runtime crates and AutoRootBus configurations. - Enhanced test coverage: added integration test booting with active-i3c1 feature to validate runtime selection and MCTP transport paths. 2) Major bugs fixed: - No documented major bugs fixed in this month’s scope. 3) Overall impact and accomplishments: - Enables flexible hardware configurations with dual I3C cores, improving ROM recovery and MCTP transport robustness. Runtime strap-based selection reduces configuration errors and simplifies future maintenance. The changes establish groundwork for upstream contributions to soc_address_map and related firmware/codegen for i3c1. 4) Technologies/skills demonstrated: - Embedded firmware architecture: memory-mapped I/O, runtime peripheral selection, and ROM boot flow. - Emulator/FPGA runtime integration and codegen for a new peripheral (I3C1). - Rust-based firmware development patterns, peripheral wiring, and test automation. - Upstream-oriented changes to address maps and strap configurations.

December 2025 (2025-12): Implemented FPGA testing reliability improvements and launched MLDSA Wycheproof test suite for caliptra-sw. The work consolidated ROM selection for FPGA tests, hardened synchronization and boot-test flows, and replaced deprecated reset calls to enable robust FPGA testing. Delivered MLDSA-focused Wycheproof tests with updated dependencies, aligning test coverage with Caliptra's MLDSA constraints. Result: more reliable FPGA validation, fewer flaky CI runs, and stronger MLDSA verification.

November 2025 monthly summary focusing on key accomplishments and business impact across caliptra-mcu-sw and caliptra-sw. Highlights include revocation fuse population in emulator, RTL-aligned register documentation, and FPGA test-harness ROM selection improvements, delivering reliability, security, and maintainability gains across firmware and test infrastructure.

September 2025 monthly summary for chipsalliance/caliptra-sw. Delivered a focused SHA512 input padding trimming enhancement to improve precise hashing when input length does not align with block size. Implemented via updates to the update_bytes method and added targeted tests. The change enables trimming unwanted padding during hash updates, improving data integrity for streaming data scenarios and interoperability with non-aligned inputs.

July 2025: Delivered the MCTP GetVersionSupport feature in chipsalliance/caliptra-mcu-sw, enabling version reporting for MCTP Base and Control protocols. The work defined the command, implemented processing logic, and added unit tests to validate behavior, with a focus on interoperability and future extensibility. No major bugs were reported this month for the repository.

June 2025 monthly summary for chipsalliance/caliptra-mcu-sw: Focused on stabilizing boot and reducing initialization flakiness. Implemented Watchdog Timer (WDT) initialization and disablement to prevent premature resets during kernel boot across emulator and FPGA runtimes. This entailed configuring specific WDT timeouts at ROM level and ensuring the WDT is disabled before entering the kernel main loop, addressing boot-time instability observed in CI and hardware simulations. The change is backed by commit 71cfa560f76deab3716d1be7fe2e827d101cdec6 with message 'Set wdt timer in rom and disable before kernel main loop (#241)'.

September 2024 monthly summary for Dasharo/coreboot focusing on DIMM_MAX consolidation. Implemented removal of DIMM_MAX from mainboard configuration and moved it to a SoC property to align with ADL platform design, reducing configuration complexity and potential errors. This change was tracked in commit 6efc32b6c610bcbec4125a3219a1e23d3a8a34e1 with message 'mb/cwwk/ald: Remove DIMM_MAX'.

2024-08 Monthly Summary — Dasharo/coreboot Overview: • Focused on stabilizing the build process for the coreboot repository. No new features were introduced this month; primary effort centered on eliminating a non-critical warning that could interrupt builds, thereby improving reliability and speed of iteration. Key achievements: 1) Implemented a Makefile.mk adjustment to suppress a stack-usage LTO link warning for spi_flash_cmd_write, preventing potential build interruptions. 2) Ensured the warning is treated as a non-error, maintaining build stability across CI and local development environments. 3) Applied changes within the Dasharo/coreboot repository (commit: 01dfc9b18730189445353422a5569e9d9865f5e3). 4) Resulted in more stable and predictable builds with no functional changes to SPI flash write logic. Impact: • Reduced build churn and triage time, accelerating release pipelines and daily development workflow. • Improved developer confidence in the build system and SPI flash-related firmware paths. Technologies/skills demonstrated: • Build system tuning and Makefile adjustments • LTO/linker warning handling and non-error configuration • C/C++ build pipeline maintenance for core firmware projects • Change impact carried with minimal risk to existing SPI flash functionality

In March 2024, Dasharo/coreboot delivered a focused LLD-related improvement to loadable segments to align with BFD memory sizing and padding behavior. The change adds logic in the LLD linker to organize loadable segments in a way that's compatible with BFD's handling of memory sizes and introduces checks for consecutive physical addresses based on LLD's padding to preserve segment integrity across builds. Commit e15b584961e682ba73210f96dfcab8ebfc5551bb (util/cbfstool: Deal with how lld organizes loadable segments). Major bugs fixed: None reported this month. Overall impact: strengthens build reliability and predictability of flash layouts, reduces risk of segment corruption, and improves cross-repo maintainability. Technologies/skills demonstrated: LLD linker configuration, BFD integration, linker tooling, cbfstool usage, and cross-team coordination.

February 2024 - Dasharo/coreboot: Key feature delivered: Integrated the public Intel FSP binary and headers for Sapphire Rapids-SP, hooking up the FSP assets to the coreboot build. Commit: 6a8c93416a374a3e63f3fc7375b069d2199bc2b9.