Upgrading my Chumby 8 kernel part 13: the end

This blog post marks the conclusion of a series detailing the upgrade of the Chumby 8's kernel from the original 2.6.28 to a modern 6.x Linux kernel. The author, Doug Brown, reflects on the two-year journey that began with updating U-Boot and involved overcoming various technical challenges. Although most of the work was completed by early 2023, the author continued to document the process and address minor issues. The post summarizes the contributions made to different subsystems, including clock management, audio support, DMA, ARM architecture, PWM, MMC, Wi-Fi, and serial drivers. Key achievements include adding missing clocks, fixing bugs, and enhancing driver support for the GC300 GPU and WM8961 codec. The author notes that while some changes have been submitted to the mainline kernel, others remain in a personal branch due to the need for further cleanup or lack of interest in the older ARM SoC. The experience has been mixed, with some patches initially ignored, leading to frustration. However, the author expresses pride in the successful implementation of the SDHCI driver and improvements to the Wi-Fi driver, which now works with modern WPA supplicant versions. The post concludes with an acknowledgment that while the project may never be fully complete, the progress made has been significant, and the author remains open to future updates as new kernel versions are released.