kumquat-buildroot/fs/initramfs/Config.in

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config BR2_TARGET_ROOTFS_INITRAMFS
bool "initramfs for initial ramdisk of linux kernel"
depends on BR2_LINUX_KERNEL
help
Integrate the root filesystem generated by Buildroot as an
initramfs inside the kernel image. This integration will
take place automatically.
The rootfs.initramfs file generated in the images/ directory
is only a text file describing the contents of the initramfs
in a format understood by the CONFIG_INITRAMFS_SOURCE kernel
configuration option.
Note that enabling initramfs together with other filesystem
formats doesn't make sense: you would end up having two
identical root filesystems, one embedded inside the kernel
image, and one separatly.
comment "initramfs requires a Linux kernel to be built"
depends on !BR2_LINUX_KERNEL