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authorAlessandro Rubini <rubini@gnudd.com>2013-06-19 01:47:35 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-19 02:41:04 +0400
commit6c62a895e572145f8aa24f2040d1bb8eff473313 (patch)
tree4e6d1186c8491347c6c561c6ff65a5a738cdf3fb /Documentation/fmc/fmc-fakedev.txt
parent022c674728f45ad22ce2bb5eb628ac9d3dbc3aea (diff)
downloadlinux-6c62a895e572145f8aa24f2040d1bb8eff473313.tar.xz
FMC: add a software carrier driver
This fake carrier is designed to help FMC users understand how a carrier driver works, and to experiment the behaviour with EEPROM reprogramming (with a mezzanine driver commited later). This carrier can register up to 4 (fake) mezzanines. We have real carriers (both on PCI-E and VME), but they are bigger things and are not part of this submission. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch> Acked-by: Emilio G. Cota <cota@braap.org> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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+fmc-fakedev
+===========
+
+This package includes a software-only device, called fmc-fakedev, which
+is able to register up to 4 mezzanines (by default it registers one).
+Unlike the SPEC driver, which creates an FMC device for each PCI cards
+it manages, this module creates a single instance of its set of
+mezzanines.
+
+It is meant as the simplest possible example of how a driver should be
+written, and it includes a fake EEPROM image (built using the tools
+described in *note FMC Identification::),, which by default is
+replicated for each fake mezzanine.
+
+You can also use this device to verify the match algorithms, by asking
+it to test your own EEPROM image. You can provide the image by means of
+the eeprom= module parameter: the new EEPROM image is loaded, as usual,
+by means of the firmware loader. This example shows the defaults and a
+custom EEPROM image:
+
+ spusa.root# insmod fmc-fakedev.ko
+ [ 99.971247] fake-fmc-carrier: mezzanine 0
+ [ 99.975393] Manufacturer: fake-vendor
+ [ 99.979624] Product name: fake-design-for-testing
+ spusa.root# rmmod fmc-fakedev
+ spusa.root# insmod fmc-fakedev.ko eeprom=fdelay-eeprom.bin
+ [ 121.447464] fake-fmc-carrier: Mezzanine 0: eeprom "fdelay-eeprom.bin"
+ [ 121.462725] fake-fmc-carrier: mezzanine 0
+ [ 121.466858] Manufacturer: CERN
+ [ 121.470477] Product name: FmcDelay1ns4cha
+ spusa.root# rmmod fmc-fakedev
+
+After loading the device, you can use the write_ee method do modify its
+own internal fake EEPROM: whenever the image is overwritten starting at
+offset 0, the module will unregister and register again the FMC device.
+This is shown in fmc-write-eeprom.txt