create a ramfs in VxWorks

In Linux:

# mkdir -p /mnt/tmp
# mount -t tmpfs -o size=20m tmpfs /mnt/tmp
# mount
  tmpfs on /mnt/tmp type tmpfs (rw,size=20m)

# df -h
  tmpfs                  20M     0   20M   0% /mnt/tmp
# dd if=/dev/zero of=/mnt/tmp/file bs=1024 count=1024
# df -h
  tmpfs                  20M  1.1M   19M   6% /mnt/tmp

# mkfs -t ext3 -L "RamDisk 1" /dev/ram0

# mkdir -p /mnt/rd
# mount /dev/ram0 /mnt/rd -t ext3
# mount
  /dev/ram0 on /mnt/rd type ext3 (rw)

# df -h
  /dev/ram0             3.9M  1.1M  2.7M  29% /mnt/rd
# dd if=/dev/zero of=/mnt/rd/file bs=1024 count=1024
# df -h
  /dev/ram0             3.9M  2.1M  1.7M  56% /mnt/rd

In VxWorks:

I hate VxWorks

Reference:
http://www.thegeekstuff.com/2008/11/overview-of-ramfs-and-tmpfs-on-linux
http://www.vanemery.com/Linux/Ramdisk/ramdisk.html

http://www.fys.uio.no/studier/kurs/fys4220/docs/vxworks/guide/index.html
http://www.fys.uio.no/studier/kurs/fys4220/docs/vxworks/guide/c-iosys7.html