I am designing a sequential & fail safe logging system that writes directly to the SPI flash to avoid the overhead of a file system. It however relies heavily on partial page writes both for writing contents and tracking allocations.

Is there any documentation available listing the internal flash ...

I have designed my own board for ESP32-WROOM-32D but I'm having issues with boot mode selection. It seems that the internal pullup of IO0 is not working, as it boots to download mode by default. Checking the voltage at boot it is indeed at 0V rather than high. After connecting a 10k resistor to 3V3 ...