If you search exfat implementation: FatFS from
http://elm-chan.org/fsw/ff/00index_e.html is a good choice, since it's:
1. has a better friend license than GPL/LGPL
2. designed for small embedded device natively
BTW, if the community wants another fat implementation, we could upstream
NuttX FS wrapper, which has been used in the product for several years.
On Sat, Mar 23, 2024 at 3:51 AM Tomek CEDRO wrote:
> On Fri, Mar 22, 2024 at 7:54 PM Alan C. Assis wrote:
> > Hi Dmitri,
> > But I think even an open-source implementation will end-up paying
> > royalties, unless you are member of OIN:
> > https://www.paragon-software.com/exfat-license/
>
> Here is a good page on exFAT along with Legal Status and List of
> Implementations sections:
>
> https://en.wikipedia.org/wiki/ExFAT
>
> Looks like Paragon Software is a proprietary implementation too.
>
>
> OIN membership is something else and it seems free:
>
> https://openinventionnetwork.com/our-members/funding-members-and-licensees/
>
> According to wikipedia Apache is covered by OIN, not sure if this is
> about web server or all of the Apache Foundation projects? Maybe this
> is the way to get exFAT in NuttX?
>
> https://en.wikipedia.org/wiki/Open_Invention_Network
>
>
> > So, maybe you could think about some alternatives, like porting EXT3 to
> > NuttX (but that is not an easy task, since even FreeBSD doesn't support
> > EXT3).
>
> On FreeBSD we have lots of filesystems supported by FUSE and it works
> pretty well now. Its not a part of the system but user can install it
> from ports/packages. This is the implementation in use (GNU license):
>
> https://github.com/relan/exfat
>
> Here is a detailed filesystem comparison page:
>
> https://en.wikipedia.org/wiki/Comparison_of_file_systems
>
> Before ZFS was introduced to FreeBSD we used UFS(2) (Unix File System)
>
> https://en.wikipedia.org/wiki/Unix_File_System
>
>
> The most universal and open filesystem is UDF (POSIX compliant) but it
> varies in implementations and versions and no write support for all of
> the versions so its kinda messy and platform specific. It was (and
> probably still is) not really a good multiplatform replacement. I
> tried using it long time ago with FreeBSD, Linux and Windows as common
> filesystem on data partition for all of the OS on a single machine.
> But I sticked to EXT2. Now I simply use ZFS on FreeBSD. But ZFS even
> nowadays is still not a solution to work with a single data partition
> on various OS and definitely not an embedded solution. People simply
> used separate machine with NAS for storage over NFS. Idea for
> universal filesystem seems dead :-(
>
> UDF is widely used nowadays on top of ISO9660 to burn optical disks
> with large files (i.e. double layer DVD or BluRay). All systems can
> read it. Not all can write it on the fly (it is usually used to create
> static ISO+UDF image). But in theory it seems better than exFAT!
>
> https://en.wikipedia.org/wiki/Universal_Disk_Format
>
> I found some old GSoC 2012 page on UDF implementation in FreeBSD
> (based on NetBSD code):
>
> https://wiki.freebsd.org/SummerOfCode2012/UDFImplementation
>
>
> Having a modern universal filesystem support in NuttX seems important.
>
> Maybe UDF 2.60 implementation could happen?
>
> exFAT seems more popular. Maybe Apache could help here over the OIN?
> And most of the existing exFAT implementations are covered by GNU
> license so that may be no go for some companies / projects.
>
> And the standard question who is willing to invest time / cash for
> that implementation?
>
>
> UDF has some interesting features that may beneficial for instance
> when streaming video of backing up data to a memory for instance VAT /
> Virtual Allocation Table mode that is incremental write once, or
> Spared mode that is used to write to rewritable media. And there is a
> BSD licensed implementation already out there.
>
> Also when recording multimedia stream is it VERY important to choose
> proper container format. For instance MP4 must be properly closed in
> order to be opened - kind of nightmare of aviation recording when
> camera hangs/breaks in the middle of flight and then folks cannot even
> open a recording. MKV seems better choice. But (in)famous GoPro still
> uses MP4 ;-)
>
> --
> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
>
