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CONFIG_NFILE_DESCRIPTORS=0 can no longer be used to disable the file system. NuttX with no file system does not make sense.

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Squashed commit of the following:

    configs/:  The few configurations that formerly set CONFIG_NFILE_DESCRIPTORS=0 should not default, rather they should set the number of descriptors to 3.
    fs/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    tools/:  Tools updates for changes to usage of CONFIG_NFILE_DESCRIPTORS.
    syscall/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    libs/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    include/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    drivers/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    Documentation/:  Remove all references to CONFIG_NFILE_DESCRIPTORS == 0
    binfmt/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    arch/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    net/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    sched/:  Remove all conditional logic based on CONFIG_NFILE_DESCRIPTORS == 0
    sched/Kconfig:  CONFIG_NFILE_DESCRIPTORS may no longer to set to a value less than 3
    configs/:  Remove all settings for CONFIG_NFILE_DESCRIPTORS < 3
This commit is contained in:
Gregory Nutt
2019-02-11 12:09:26 -06:00
parent 07bcc6292a
commit a64869aa67
141 changed files with 374 additions and 1008 deletions
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Documentation/NuttxPortingGuide.html
+3 -6
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@@ -4926,9 +4926,7 @@ void iob_dump(FAR const char *msg, FAR struct iob_s *iob, unsigned int len,
</p>
<p><b>Pseudo Root File System</b>.
Or, a simple <i>in-memory</i>, <i>pseudo</i> file system can be enabled.
This simple file system can be enabled setting the CONFIG_NFILE_DESCRIPTORS
option to a non-zero value (see <a href="#apndxconfigs">Appendix A</a>).
A simple <i>in-memory</i>, <i>pseudo</i> file system can be enabled by default.
This is an <i>in-memory</i> file system because it does not require any
storage medium or block driver support.
Rather, file system contents are generated on-the-fly as referenced via
@@ -4985,9 +4983,8 @@ void iob_dump(FAR const char *msg, FAR struct iob_s *iob, unsigned int len,
<li>Other <i>Specialized</i> Drivers.</li>
</ul>
These different device driver types are discussed in the following paragraphs.
Note: device driver support requires that the <i>in-memory</i>, <i>pseudo</i> file system
is enabled by setting the CONFIG_NFILE_DESCRIPTORS in the NuttX configuration file to a
non-zero value.
Note: device driver support depends on the <i>in-memory</i>, <i>pseudo</i> file system
that is enabled by default.
</p>
<h2><a name="chardrivers">6.1 Character Device Drivers</a></h2>