Section: Devices and Network Interfaces (4)
Updated: 1999/10/25 19:50:46
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memory_cs - MTD-aware PCMCIA memory card driver
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
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 'ddddxarr'. 'dddd'
is the device number, with one card counting as one memory device.
memory, and 'rr' is the region number (for indirect devices). When
is bound to a card, it will report its major and minor device numbers
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
Common memory direct access, character special device.
Attribute memory direct access, character special device.
Common memory region 0, character special device.
Common memory region 0, block special device.
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,
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
contents of the card's attribute memory.
Selects the PCMCIA debugging level. This parameter is only available
if the module is compiled with debugging enabled. A non-zero value
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.
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).
These are defined in
This takes an argument of type
The structure will be filled in with memory region information for
this device, such as access speed, erase block size, and JEDEC
This takes an argument of type
specifying the offset and length of a memory region to be erased.
David Hinds - firstname.lastname@example.org
cardmgr(8), pcmcia(5), memory_cb(4).
- SEE ALSO
This document was created by
using the manual pages.
Time: 23:01:58 GMT, December 21, 1999