In this post, the author discusses the process of upgrading their Chumby 8 to run a modern Linux kernel and focusing on enabling the real-time clock (RTC). Despite assumptions about using the PXA168’s internal RTC being incorrect, the Chumby 8 utilizes the STM32F101 cryptoprocessor to manage date and time. By understanding the boot scripts and user-space solutions, the author successfully implements a system to restore and save date/time using the cryptoprocessor’s uptime counter. They appreciate the simplicity and effectiveness of the userspace solution without the need for complex kernel logic. The post ends with anticipation for future content on making the SD/CF/MS card reader work similar to the original firmware’s approach.
https://www.downtowndougbrown.com/2024/06/upgrading-my-chumby-8-kernel-part-10-rtc/