You are mistaking the concept of filesystem and a block device type. You
are trying to use the ramdisk block devices but are talking about
filesystems.
As for the reason why you couldn't use the ramdisk (/dev/ram* devices) it
is due to missing support for them in your kernel configuration:
On Wed, 24 Apr 2002, Roy Sigurd Karlsbakk wrote:
> # CONFIG_BLK_DEV_RAM is not set
> # CONFIG_BLK_DEV_INITRD is not set
enable CONFIG_BLK_DEV_RAM and /dev/ram* will become useable. If you also
use initrd then enable CONFIG_BLK_DEV_INITRD as well.
Regards
Tigran
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