Why a file system required in an embedded Device
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From: bigbrownbeastie on 24 Feb 2010 04:12 On Feb 24, 6:12 am, "Jalon" <jpeeyush(a)n_o_s_p_a_m.gmail.com> wrote: > Hi, > > I have this question in mind, Why do we need a file system as part of any > RTOS when it is intended for a target embedded device(Low memory and less > storage of data). > I can imagine a system having lots of data managed in terms of files in > need of File system but probably not many embedded devices store that > amount of data. > > Is there a particular need/scenario which makes file system required in an > embedded system. > > Thnx, > PJ > > --------------------------------------- > Posted throughhttp://www.EmbeddedRelated.com Sounds like Homework
From: Paul Keinanen on 24 Feb 2010 04:58 On Wed, 24 Feb 2010 00:12:25 -0600, "Jalon" <jpeeyush(a)n_o_s_p_a_m.gmail.com> wrote: >Hi, > >I have this question in mind, Why do we need a file system as part of any >RTOS when it is intended for a target embedded device(Low memory and less >storage of data). >I can imagine a system having lots of data managed in terms of files in >need of File system but probably not many embedded devices store that >amount of data. > >Is there a particular need/scenario which makes file system required in an >embedded system. Most real time programmers would like to stay away from any kinds of mechanical disk drives if possible and hence there is not much of a need for a file system. In many RT systems, disk/flash file systems might be usable in the startup phase to load parameters etc, before the actual RT work starts. The null task is also a usable place in doing non-deterministic disk-I/O. In actual RT processing, you simply can not use blocking I/O requests such as typical read/write, but use requests like "read sector 6 track 56", then perform dozens of other operations and at some later time after hundred of other operations have been performed, handle the callback or interrupt service routine that actually returned the requested data. While a file system might be usable for loading startup parameters from a disk/flash and hence require a file system, those systems are a nuisance for actual RT operations.
From: tim.... on 24 Feb 2010 05:11 "Jalon" <jpeeyush(a)n_o_s_p_a_m.gmail.com> wrote in message news:f8qdnfRgdKTUXhnWnZ2dnUVZ_q-dnZ2d(a)giganews.com... > Hi, > > I have this question in mind, Why do we need a file system as part of any > RTOS when it is intended for a target embedded device(Low memory and less > storage of data). > I can imagine a system having lots of data managed in terms of files in > need of File system but probably not many embedded devices store that > amount of data. > > Is there a particular need/scenario which makes file system required in an > embedded system. > Any need for a file system will be imposed by the actual application, not by the fact that the solution is "embedded" or that it uses an RTOS. tim
From: Ignacio G. T. on 24 Feb 2010 08:27 El 24/02/2010 7:12, Jalon escribi�: > Hi, > > I have this question in mind, Why do we need a file system as part of any > RTOS when it is intended for a target embedded device(Low memory and less > storage of data). > I can imagine a system having lots of data managed in terms of files in > need of File system but probably not many embedded devices store that > amount of data. > > Is there a particular need/scenario which makes file system required in an > embedded system. > Third-party software with standard file-based dependencies (web servers, PLC packages, SSL packages... to name a few I have met in real life.) -- Saludos. Ignacio G.T.
From: Grant Edwards on 24 Feb 2010 10:22
On 2010-02-24, Jalon <jpeeyush(a)n_o_s_p_a_m.gmail.com> wrote: > I have this question in mind, Why do we need a file system as part of any > RTOS when it is intended for a target embedded device(Low memory and less > storage of data). You've made a false assumption that all embedded devices have little low memory require little storage of data. Some embedded devices have hundreds of megabytes of RAM and have to log gigibytes of data from a variety of sources. Filesystems are great for that. -- Grant Edwards grante Yow! for ARTIFICIAL at FLAVORING!! visi.com |