[RTEMS Project] #4869: Add QSPI Flash Device API

[RTEMS trac]

#4869: Add QSPI Flash Device API
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 Reporter:  Aaron N      |       Owner:  chrisj@…
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  6.1
Component:  dev/spi      |     Version:  6
 Severity:  normal       |  Resolution:
 Keywords:               |  Blocked By:
 Blocking:               |
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Comment (by Chris Johns):

 Can we please have an `ioctl` command that lets a user can set a region in
 the flash device access is limited to? It may be nice to make the `read`
 and `write` calls relative to a region's base address. By default a device
 open maps to the entire flash.

 The use case is allowed shared access to the flash device. For example
 JFFS on a region and the ability to modified a boot area.

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Ticket URL: <http://devel.rtems.org/ticket/4869#comment:2>
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