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This article aims at presenting the directory structure of the Linux root file system available on STM32 board.
All files and directories are located under the root directory (/), in compliance with the File system Hierarchy Standard.
This root directory corresponds to the Linux root file system (rootfs partition), as defined in Flash partitions. Note also that the user file system (userfs partition) and the boot file system (bootfs partition) can be accessed through the /usr/local mounting point and through the /boot mounting point, respectively.
The directories are shown in green, while the files are in black.
/ Root directory (rootfs partition) ├── bin Essential user binaries (e.g. /bin/cat, /bin/ls, /bin/cp...) │ └── [...] ├── boot Mounting point for the boot file system (bootfs partition): see below ├── config ├── dev Device files (e.g. /dev/null, /dev/tty0, /dev/video0...) ├── etc System-wide configuration files (e.g. /etc/xdg/weston/weston.ini Weston configuration file...) ├── home Users' home directories (containing saved files, personal settings...) ├── lib Essential system libraries for the binaries in /bin and /sbin (e.g. libncurses.so.5.9...) │ ├── modules │ │ └── 4.14.48 │ │ ├── kernel Linux kernel modules │ │ │ └── [...] │ │ ├── modules.dep List of module dependencies (generated by depmod) │ │ └── [...] │ └── [...] ├── lost+found ├── media Mount points for removable media devices
├── mnt Temporarily mounted file systems ├── proc Pseudo filesystem providing process and kernel information as files (e.g. /proc/cpuinfo, /proc/version...) ├── run Run-time variable data (information about the running system since last boot) ├── sbin Essential system binaries (e.g. /sbin/fsck, /sbin/init, /sbin/modprobe...) ├── sys Information about devices, drivers, and some kernel features (e.g. /sys/kernel/debug akadebgufs...) ├── tmp Temporary files ├── usr User utilities and applications │ ├── bin Non-essential user binaries (e.g. /usr/bin/lsusb, /usr/bin/weston...) │ ├── lib Non-essential system libraries for the binaries in /usr/bin and /usr/sbin │ ├── local Mounting point for the user file system (userfs partition): see below │ ├── sbin Non-essential system binaries (e.g. /usr/sbin/alsactl, /usr/sbin/weston.sh...) │ ├── share Architecture-independent (shared) data │ └── [...] └── var Variable files
- Boot file system mounting point
/boot bootfs partition ├── stm32mp157c-d[*].dtb Linux kernel device tree blob files → STM32MP15 Discovery kits ├── stm32mp157c-e[*].dtb Linux kernel device tree blob files → STM32MP15 Evaluation boards ├── uImage Linux kernel binary image file (with U-Boot wrapper) └── [...]
- User file system mounting point
/usr/local userfs partition ├── examples │ ├── STM32MP15_DISCO Examples of firmwares running on Arm Cortex-M4 → STM32MP15 Discovery kits │ │ ├── GPIO_EXTI GPIO EXTI example started by Linux Remote Processor Framework │ │ │ ├── fw_cortex_m4.sh Script to start/stop the example │ │ │ ├── lib │ │ │ │ └── firmware │ │ │ │ └── STM32MP15_M4_DISCO_GPIO_EXTI.elf Firmware for this example │ │ │ └── README Helper file for this example │ │ ├── OpenAMP_TTY_echo OpenAMP TTY echo example started by Linux Remote Processor Framework │ │ │ ├── fw_cortex_m4.sh Script to start/stop the example │ │ │ ├── lib │ │ │ │ └── firmware │ │ │ │ └── STM32MP15_M4_DISCO_OpenAMP_TTY_echo.elf Firmware for this example │ │ │ └── README Helper file for this example │ │ └── OpenAMP_TTY_echo_wakeup OpenAMP TTY echo wakeup example started by Linux Remote Processor Framework │ │ ├── fw_cortex_m4.sh Script to start/stop the example │ │ ├── lib │ │ │ └── firmware │ │ │ └── STM32MP15_M4_DISCO_OpenAMP_TTY_echo_wakeup.elf Firmware for this example │ │ └── README Helper file for this example
│ └── STM32MP15_EVAL Examples of firmwares running on Arm Cortex-M4 → STM32MP15 Evaluation boards │ ├── GPIO_EXTI GPIO EXTI example started by Linux Remote Processor Framework │ │ ├── fw_cortex_m4.sh Script to start/stop the example │ │ ├── lib │ │ │ └── firmware │ │ │ └── STM32MP15_M4_EVAL_GPIO_EXTI.elf Firmware for this example │ │ └── README Helper file for this example │ ├── OpenAMP_TTY_echo OpenAMP TTY echo example started by Linux Remote Processor Framework │ │ ├── fw_cortex_m4.sh Script to start/stop the example │ │ ├── lib │ │ │ └── firmware │ │ │ └── STM32MP15_M4_EVAL_OpenAMP_TTY_echo.elf Firmware for this example │ │ └── README Helper file for this example │ ├── OpenAMP_TTY_echo_wakeup OpenAMP TTY echo wakeup example started by Linux Remote Processor Framework │ │ ├── fw_cortex_m4.sh Script to start/stop the example │ │ ├── lib │ │ │ └── firmware │ │ │ └── STM32MP15_M4_EVAL_OpenAMP_TTY_echo_wakeup.elf Firmware for this example │ │ └── README Helper file for this example │ └── QSPI_ReadWrite_IT QSPI Read/Write in interrupt mode started by Linux Remote Processor Framework │ ├── fw_cortex_m4.sh Script to start/stop the example │ ├── lib │ │ └── firmware │ │ └── STM32MP15_M4_EVAL_QSPI_ReadWrite_IT.elf Firmware for this example │ └── README Helper file for this example └── lost+found