The Source code is not stored on the device. It's available online, there's a pinned post in this forum that has all the links.
However, you might be talking about something different. So: There are AFAIK the following stores in the Kindles (all of them):
- A few fuses, set only before shipping, with some very basic boot configuration
- Initial Boot ROM, not changeable, in the SoC
- an eMMC, i.e. a chip with memory that behaves just like a MMC device, which stores extended bootloader, boot configuration, kernel, root filesystem and document filesystem. It's flash memory.
Not sure if the SoC has a small EEPROM part.
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