Discard the specified image. If no image is explicitly specified, iPXE will discard all images.
The memory used to hold the image will be released and made available for reuse.
If you are using an iPXE script that may retry downloads, then it is usually a good idea to use the
imgfree command to ensure that you do not end up with multiple copies of downloaded images. For example:
#!ipxe :retry imgfree # Discard any already-downloaded images kernel vmlinuz-2.6.32 || goto retry initrd initrd.img || goto retry boot || goto retry