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0ea6e61122
Below you will find an updated version from the original series bunching all patches into one big patch updating broken web addresses that are located in Documentation/* Some of the addresses date as far far back as 1995 etc... so searching became a bit difficult, the best way to deal with these is to use web.archive.org to locate these addresses that are outdated. Now there are also some addresses pointing to .spec files some are located, but some(after searching on the companies site)where still no where to be found. In this case I just changed the address to the company site this way the users can contact the company and they can locate them for the users. Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Thomas Weber <weber@corscience.de> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Cc: Paulo Marques <pmarques@grupopie.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Michael Neuling <mikey@neuling.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
91 lines
2.8 KiB
Plaintext
91 lines
2.8 KiB
Plaintext
C2 port support
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---------------
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(C) Copyright 2007 Rodolfo Giometti <giometti@enneenne.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Overview
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--------
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This driver implements the support for Linux of Silicon Labs (Silabs)
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C2 Interface used for in-system programming of micro controllers.
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By using this driver you can reprogram the in-system flash without EC2
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or EC3 debug adapter. This solution is also useful in those systems
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where the micro controller is connected via special GPIOs pins.
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References
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----------
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The C2 Interface main references are at (http://www.silabs.com)
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Silicon Laboratories site], see:
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- AN127: FLASH Programming via the C2 Interface at
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http://www.silabs.com/Support Documents/TechnicalDocs/an127.pdf
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- C2 Specification at
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http://www.silabs.com/pages/DownloadDoc.aspx?FILEURL=Support%20Documents/TechnicalDocs/an127.pdf&src=SearchResults
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however it implements a two wire serial communication protocol (bit
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banging) designed to enable in-system programming, debugging, and
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boundary-scan testing on low pin-count Silicon Labs devices. Currently
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this code supports only flash programming but extensions are easy to
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add.
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Using the driver
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----------------
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Once the driver is loaded you can use sysfs support to get C2port's
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info or read/write in-system flash.
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# ls /sys/class/c2port/c2port0/
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access flash_block_size flash_erase rev_id
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dev_id flash_blocks_num flash_size subsystem/
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flash_access flash_data reset uevent
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Initially the C2port access is disabled since you hardware may have
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such lines multiplexed with other devices so, to get access to the
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C2port, you need the command:
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# echo 1 > /sys/class/c2port/c2port0/access
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after that you should read the device ID and revision ID of the
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connected micro controller:
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# cat /sys/class/c2port/c2port0/dev_id
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8
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# cat /sys/class/c2port/c2port0/rev_id
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1
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However, for security reasons, the in-system flash access in not
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enabled yet, to do so you need the command:
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# echo 1 > /sys/class/c2port/c2port0/flash_access
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After that you can read the whole flash:
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# cat /sys/class/c2port/c2port0/flash_data > image
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erase it:
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# echo 1 > /sys/class/c2port/c2port0/flash_erase
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and write it:
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# cat image > /sys/class/c2port/c2port0/flash_data
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after writing you have to reset the device to execute the new code:
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# echo 1 > /sys/class/c2port/c2port0/reset
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