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authorJean Delvare <khali@linux-fr.org>2009-12-06 18:30:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-09 18:59:52 -0800
commit5327b9b83a9c45a3fcbcda224a2b02d9eea9f6bb (patch)
tree757452708d27b1459945d651aae064e15f9ccfe4 /Documentation/c2port.txt
parente3cc2226e99cfadbf300dde892c4a16d742a0856 (diff)
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Doc: use misc-devices/ dir for drivers
We have a directory for misc drivers documentation, let's use it. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: "Darrick J. Wong" <djwong@us.ibm.com> Cc: Rodolfo Giometti <giometti@linux.it> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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- C2 port support
- ---------------
-
-(C) Copyright 2007 Rodolfo Giometti <giometti@enneenne.com>
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-
-
-Overview
---------
-
-This driver implements the support for Linux of Silicon Labs (Silabs)
-C2 Interface used for in-system programming of micro controllers.
-
-By using this driver you can reprogram the in-system flash without EC2
-or EC3 debug adapter. This solution is also useful in those systems
-where the micro controller is connected via special GPIOs pins.
-
-References
-----------
-
-The C2 Interface main references are at (http://www.silabs.com)
-Silicon Laboratories site], see:
-
-- AN127: FLASH Programming via the C2 Interface at
-http://www.silabs.com/public/documents/tpub_doc/anote/Microcontrollers/Small_Form_Factor/en/an127.pdf, and
-
-- C2 Specification at
-http://www.silabs.com/public/documents/tpub_doc/spec/Microcontrollers/en/C2spec.pdf,
-
-however it implements a two wire serial communication protocol (bit
-banging) designed to enable in-system programming, debugging, and
-boundary-scan testing on low pin-count Silicon Labs devices. Currently
-this code supports only flash programming but extensions are easy to
-add.
-
-Using the driver
-----------------
-
-Once the driver is loaded you can use sysfs support to get C2port's
-info or read/write in-system flash.
-
-# ls /sys/class/c2port/c2port0/
-access flash_block_size flash_erase rev_id
-dev_id flash_blocks_num flash_size subsystem/
-flash_access flash_data reset uevent
-
-Initially the C2port access is disabled since you hardware may have
-such lines multiplexed with other devices so, to get access to the
-C2port, you need the command:
-
-# echo 1 > /sys/class/c2port/c2port0/access
-
-after that you should read the device ID and revision ID of the
-connected micro controller:
-
-# cat /sys/class/c2port/c2port0/dev_id
-8
-# cat /sys/class/c2port/c2port0/rev_id
-1
-
-However, for security reasons, the in-system flash access in not
-enabled yet, to do so you need the command:
-
-# echo 1 > /sys/class/c2port/c2port0/flash_access
-
-After that you can read the whole flash:
-
-# cat /sys/class/c2port/c2port0/flash_data > image
-
-erase it:
-
-# echo 1 > /sys/class/c2port/c2port0/flash_erase
-
-and write it:
-
-# cat image > /sys/class/c2port/c2port0/flash_data
-
-after writing you have to reset the device to execute the new code:
-
-# echo 1 > /sys/class/c2port/c2port0/reset
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