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    Subject[PATCH 00/14] Pramfs: Persistent and protected ram filesystem
    This is a second attempt at mainlining Pramfs. The first attempt was
    back in early 2004 by MontaVista. Since then the kernel code has almost
    been completely rewritten. So my first item on the list was porting the
    code on a recent kernel version. After that I added the XIP support.

    Now some FAQs:

    What is the goal of this filesystem?

    Many embedded systems have a block of non-volatile RAM separate from
    normal system memory, i.e. of which the kernel maintains no memory page
    descriptors. For such systems it would be beneficial to mount a
    fast read/write filesystem over this "I/O memory", for storing
    frequently accessed data that must survive system reboots and power
    cycles. An example usage might be system logs under /var/log, or a user
    address book in a cell phone or PDA.

    Why this kind of filesystem should be "mainlined"?

    Linux traditionally had no support for a persistent, non-volatile
    RAM-based filesystem, persistent meaning the filesystem survives a
    system reboot or power cycle intact. The RAM-based filesystems such as
    tmpfs and ramfs have no actual backing store but exist entirely in the
    page and buffer caches, hence the filesystem disappears after a system
    reboot or power cycle.

    Are there any pending patents on this code?

    NO, there aren't patents pending on this code. MontaVista had a pending
    patent application but now it has abandoned this way. Daniel Walker can
    confirm that.


    Marco





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