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-README on the Compact Flash for Card Engines
-============================================
-
-There are three challenges in supporting the CF interface of the Card
-Engines.  First, every IO operation must be followed with IO to
-another memory region.  Second, the slot is wired for one-to-one
-address mapping *and* it is wired for 16 bit access only.  Second, the
-interrupt request line from the CF device isn't wired.
-
-The IOBARRIER issue is covered in README.IOBARRIER.  This isn't an
-onerous problem.  Enough said here.
-
-The addressing issue is solved in the
-arch/arm/mach-lh7a40x/ide-lpd7a40x.c file with some awkward
-work-arounds.  We implement a special SELECT_DRIVE routine that is
-called before the IDE driver performs its own SELECT_DRIVE.  Our code
-recognizes that the SELECT register cannot be modified without also
-writing a command.  It send an IDLE_IMMEDIATE command on selecting a
-drive.  The function also prevents drive select to the slave drive
-since there can be only one.  The awkward part is that the IDE driver,
-even though we have a select procedure, also attempts to change the
-drive by writing directly the SELECT register.  This attempt is
-explicitly blocked by the OUTB function--not pretty, but effective.
-
-The lack of interrupts is a more serious problem.  Even though the CF
-card is fast when compared to a normal IDE device, we don't know that
-the CF is really flash.  A user could use one of the very small hard
-drives being shipped with a CF interface.  The IDE code includes a
-check for interfaces that lack an IRQ.  In these cases, submitting a
-command to the IDE controller is followed by a call to poll for
-completion.  If the device isn't immediately ready, it schedules a
-timer to poll again later.