esp-idf/components/vfs/Kconfig

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menu "Virtual file system"
config VFS_SUPPORT_IO
bool "Provide basic I/O functions"
default y
help
If enabled, the following functions are provided by the VFS component.
open, close, read, write, pread, pwrite, lseek, fstat, fsync, ioctl, fcntl
Filesystem drivers can then be registered to handle these functions
for specific paths.
Disabling this option can save memory when the support for these functions
is not required.
Note that the following functions can still be used with socket file descriptors
when this option is disabled:
close, read, write, ioctl, fcntl.
config VFS_SUPPORT_DIR
bool "Provide directory related functions"
default y
# If some filesystem is used, adding I/O support is probably needed and
# is not a big overhead, compared to code size of the filesystem,
# so make this depend on IO.
depends on VFS_SUPPORT_IO
help
If enabled, the following functions are provided by the VFS component.
stat, link, unlink, rename, utime, access, truncate, rmdir, mkdir,
opendir, closedir, readdir, readdir_r, seekdir, telldir, rewinddir
Filesystem drivers can then be registered to handle these functions
for specific paths.
Disabling this option can save memory when the support for these functions
is not required.
config VFS_SUPPORT_SELECT
bool "Provide select function"
default y
# Dependency on !LWIP_USE_ONLY_LWIP_SELECT is for compatibility
depends on VFS_SUPPORT_IO && !LWIP_USE_ONLY_LWIP_SELECT
help
If enabled, select function is provided by the VFS component, and can be used
on peripheral file descriptors (such as UART) and sockets at the same time.
If disabled, the default select implementation will be provided by LWIP for
sockets only.
Disabling this option can reduce code size if support for "select" on UART file
descriptors is not required.
config VFS_SUPPRESS_SELECT_DEBUG_OUTPUT
bool "Suppress select() related debug outputs"
depends on VFS_SUPPORT_SELECT
default y
help
Select() related functions might produce an inconveniently lot of
debug outputs when one sets the default log level to DEBUG or higher.
It is possible to suppress these debug outputs by enabling this
option.
config VFS_SELECT_IN_RAM
bool "Make VFS driver select() callbacks IRAM-safe"
default n
depends on VFS_SUPPORT_SELECT
help
If enabled, VFS driver select() callback function will be placed in IRAM.
config VFS_SUPPORT_TERMIOS
bool "Provide termios.h functions"
default y
# Very likely, only makes sense for UART VFS driver, which itself depends on VFS_SUPPORT_IO
depends on VFS_SUPPORT_IO
help
Disabling this option can save memory when the support for termios.h is not required.
config VFS_MAX_COUNT
int "Maximum Number of Virtual Filesystems"
default 8
range 1 20
depends on VFS_SUPPORT_IO
help
Define maximum number of virtual filesystems that can be registered.
menu "Host File System I/O (Semihosting)"
depends on VFS_SUPPORT_IO
config VFS_SEMIHOSTFS_MAX_MOUNT_POINTS
int "Host FS: Maximum number of the host filesystem mount points"
default 1
help
Define maximum number of host filesystem mount points.
endmenu
config VFS_INITIALIZE_DEV_NULL
bool "Initialize /dev/null VFS"
default y
depends on VFS_SUPPORT_IO
help
If enabled, /dev/null VFS will be automatically initialized at startup.
endmenu