Commit Graph

5 Commits

Author SHA1 Message Date
Brooks Davis
f43581345b MFP4 217312, 222008, 222052, 222053, 222673, 231484, 231491, 231565, 570643
Rework the timeout code to use actual time rather than a DELAY() loop and
to use both typical and maximum to allow logging of timeout failures.
Also correct the erase timeout, it is specified in milliseconds not
microseconds like the other timeouts.  Do not invoke DELAY() between
status queries as this adds significant latency which in turn reduced
write performance substantially.

Sanity check timeout values from the hardware.

Implement support for buffered writes (only enabled on Intel/Sharp parts
for now).  This yields an order of magnitude speedup on the 64MB Intel
StrataFlash parts we use.

When making a copy of the block to modify, also keep a clean copy around
until we are ready to commit the block and use it to avoid unnecessary
erases.  In the non-buffer write case, also use it to avoid
unnecessary writes when the block has not been erased.  This yields a
significant speedup when doing things like zeroing a block.

Sponsored by:	DARPA, AFRL
Reviewed by:	imp (previous version)
2013-09-04 17:19:21 +00:00
Jayachandran C.
9c1f1330d6 CFI fixes for big endian archs.
The flash commands and responses are little-endian and have to be
byte swapped on big-endian systems.  However the raw read of data
need not be swapped.

Make the cfi_read and cfi_write do the swapping, and provide a
cfi_read_raw which does not byte swap for reading data from
flash.
2012-03-27 15:13:12 +00:00
Sam Leffler
f2c6781bfd Add cfid, a disk interface to CFI flash devices; this enables construction
of flash-based filesystems.

Note this is not interlocked against the raw CFI device.
2009-03-09 23:16:02 +00:00
Sam Leffler
63425a7f25 Add support for frobbing Intel StrataFlash Protection Registers:
o add CFI_SUPPORT_STRATAFLASH compile option to enable support
o add new ioctls to get/set the factory and user/oem segments of the PR
  and to get/set Protection Lock Register that fuses the user segment
o add #defines for bits in the status register
o update cfi_wait_ready to take an offset so it can be used to wait for
  PR write completion and replace constants w/ symbolic names

Note: writing the user segment isn't correct; committing now to get review.

Sponsored by:	Carlson Wireless
Reviewed by:	imp, Chris Anderson
2009-02-05 18:12:07 +00:00
Marcel Moolenaar
e00251b7ed Add a driver for flash memory that implements to the Common Flash
Memory Interface (CFI). The flash memory can be read and written
to through /dev/cfi# and an ioctl() exists so processes can read
the query information.
The driver supports the AMD and Intel command set, though only
the AMD command has been tested.

Obtained from:	Juniper Networks, Inc.
2008-10-25 06:18:12 +00:00