ftl_cs(4)
NAME
ftl_cs - Flash Translation Layer driver for PCMCIA memory
cards
SYNOPSIS
insmod ftl_cs.o [pc_debug=n] [major_dev=n]
DESCRIPTION
Flash memory devices typically need to be erased before
they are written, and most flash devices can only be
erased on large block boundaries like 64K or 128K. The
Flash Translation Layer driver, ftl_cs, implements a sort
of virtual sector-addressable block device that hides the
details of erase operations. Using the FTL driver, a
flash memory card can be treated as an ordinary block
device.
The ftl_cs driver allocates a major device number when it
is loaded. Minor device numbers have a bitwise layout of
'dddrrppp'. 'ddd' is the device number, with one card
counting as one device. 'rr' is the common-memory region
number, generally 0. And 'ppp' selects a logical parti
tion within the FTL region.
The default configuration script for FTL devices will cre
ate a block device with the name of the form
'/dev/ftl{d}c{r}', where '{d}' is the device number and
'{r}' is the region number, that spans the entire FTL
region. It also creates devices '/dev/ftl{d}c{r}p[1-4]'
pointing to partitions 1 through 4 within this FTL region.
An FTL region must be formatted before use. The format
ting utility, ftl_format, needs to write to the corre
sponding raw memory device rather than the FTL device
interface.
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 debug
ging. - major_dev=n
- Selects the major device number to allocate for FTL
devices. The default is to pick any available
major number.
AUTHOR
David Hinds - dahinds@users.sourceforge.net