FujiFilm's Tech History

History

In 1988, Fujifilm released their first 0.4mp digital camera, the Fujix DS-1P (first commercial digital camera)
Fuji released the $3500 Fujifilm S1 Pro in 2000, which accepted firmware updates
In 2003, Fujifilm first released a firmware update and hackers on DPReview started to tinker with it
Fujifilm started out using VxWorks, then later switched to MiSPO iTRON/NORTi
More modern cameras use ThreadX, an open source RTOS. Most of the original Fujifilm code is still present.
Modern cameras use SQLite to store some settings. SQLite starts up about 10 minutes after powering on the camera.
SQLite was introduced in ~2012 to manage special settings in the camera
In 2016-2017, a web server was introduced, with WiFi (wpa_supplicant)
In 2022, Linux is dual booted on the X-H2S

Early Fujifilm cameras started out with TX49 MIPS III CPUs but switched to ARM later on (64 bit, Little endian)
Smaller cameras have the FF4224, Arm v5 Little Endian 32 bit SoC
Later cameras are Cortex A7
The SoC has no internal memory and must be paired with external RAM chips (most of the time it's 256mb)
Flash chips tend to be under the SD card reader (and tend to be 64mb)

Vector graphics processing is handled on vglib task
Most cameras use OpenVG with the VG_KHR_EGL_image plugin. Implemented into Fuji cameras by NEC Systems Technology Ltd in the 2000s.
The rst task renders the OpenVG objects (?)

Each task tends to have a custom method of allocating memory
Each task tends to have it's own memset/memcpy/strcpy set of functions
Once SQLite is initialized manually, memory can be allocated from sqlite_mallocAlarm
Memory starts at 0x00000000 and a mirror of the same region starts at 0x400000000
Main memory seems to be 256 megabytes, and each other region (0x1, 0x2, 0x3*...) seems to be 256kb
IO regions start at 0xf0000000 (?)