complete munmap implementation; single-page references made a general munmap() implementation possible to write cleanly. . memory: let the MIOCRAMSIZE ioctl set the imgrd device size (but only to 0) . let the ramdisk command set sizes to 0 . use this command to set /dev/imgrd to 0 after mounting /usr in /etc/rc, so the boot time ramdisk is freed (about 4MB currently)
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