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RedHat 9 (Linux i386) - man page for memory_cs (redhat section 4)

MEMORY_CS(4)									     MEMORY_CS(4)

NAME
       memory_cs - MTD-aware PCMCIA memory card driver

SYNOPSIS
       insmod memory_cs.o [pc_debug=n] [mem_speed=n] [word_width=n] [force_size=n]

DESCRIPTION
       Memory_cs  is  the  Card Services driver for PCMCIA memory cards, and also provides direct
       memory access for other types of cards.	It provides  character-mode  and  block-mode  for
       accessing  any  card's  attribute and common memory address spaces, analogous to /dev/mem.
       Memory_cs will allocate a free major device number when it is  loaded.	It  provides  two
       types  of  minor  devices:  "direct" character-mode devices for raw access a card's entire
       PCMCIA common and attribute memory spaces, and "indirect" devices for  accessing  specific
       memory  partitions  via	an  appropriate  Memory Technology Driver.  The bitwise layout of
       minor device numbers is one memory device.  'x' is set if this is a direct-access  device,
       'a'  is	set  for  attribute memory, and 'rr' is the region number (for indirect devices).
       When memory_cs is bound to a card, it will report its major and minor  device  numbers  to
       cardmgr(8).

       The  default  memory card initialization script creates character special device files for
       the direct common memory and attribute memory devices.  It also creates character  special
       devices for accessing the first attribute and common memory partitions, and a block device
       for accessing the first common memory partition.  These devices have the following names:

       /dev/mem#c
	      Common memory direct access, character special device.

       /dev/mem#a
	      Attribute memory direct access, character special device.

       /dev/mem#c0c
	      Common memory region 0, character special device.

       /dev/mem#c0b
	      Common memory region 0, block special device.

       /dev/mem#a0c
	      Attribute memory region 0, character special device.

       The block special device for a card's common memory can be used to create a filesystem  on
       a  card,  and  the  device  can be mounted in much the same way as a floppy disk.  In some
       cases, you may need to explicitly specify the card's capacity when creating a filesystem.

       The character special devices can be used to read and write arbitrary numbers of bytes  to
       arbitrary  locations.   For devices that need to be explicitly erased before writing, if a
       write request is aligned and sized on erase block boundaries for the target  memory  card,
       the driver will erase the target region before writing to the card.

       Since any PCMCIA card can be accessed as a memory card, memory_cs can be bound to any card
       regardless of function, and regardless of what other drivers might also be bound  to  that
       card.   For example, this driver can be bound to a card and then used to read out the con-
       tents of the card's attribute memory.

PARAMETERS
       pc_debug=n
	      Selects the PCMCIA debugging level.  This parameter is only available if the module
	      is compiled with debugging enabled.  A non-zero value enables debugging.

       mem_speed=n
	      Sets  the  access  speed	of the shared memory window for direct access devices, in
	      nanoseconds.  The default is 0 (i.e., no extra wait states).  Values of up to  1000
	      are legal.

       word_width=n
	      A flag indicating if direct access devices should be configured for 8-bit (if 0) or
	      16-bit (if 1) transfers.	The default is 1 (16-bit).

       force_size=n
	      Explicitly specifies the size of a simple SRAM  card,  skipping  the  default  (and
	      sometimes unreliable) size check.

IOCTLS
       These are defined in <pcmcia/memory.h>.

       MEMGETINFO
	      This  takes  an  argument of type (region_info_t *), defined in <pcmcia/bulkmem.h>.
	      The structure will be filled in with memory region information  for   this  device,
	      such as access speed, erase block size, and JEDEC identifiers.

       MEMERASE
	      This  takes  an argument of type (erase_info_t *), specifying the offset and length
	      of a memory region to be erased.

AUTHOR
       David Hinds - dahinds@users.sourceforge.net

SEE ALSO
       cardmgr(8), pcmcia(5), memory_cb(4).

pcmcia-cs			       2000/06/12 21:24:48			     MEMORY_CS(4)


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