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| author | Alessandro Rubini <rubini@gnudd.com> | 2013-06-18 23:47:35 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-06-18 15:41:04 -0700 |
| commit | 6c62a895e572145f8aa24f2040d1bb8eff473313 (patch) | |
| tree | 4e6d1186c8491347c6c561c6ff65a5a738cdf3fb /Documentation/fmc | |
| parent | 022c674728f45ad22ce2bb5eb628ac9d3dbc3aea (diff) | |
| download | lwn-6c62a895e572145f8aa24f2040d1bb8eff473313.tar.gz lwn-6c62a895e572145f8aa24f2040d1bb8eff473313.zip | |
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>
Diffstat (limited to 'Documentation/fmc')
| -rw-r--r-- | Documentation/fmc/00-INDEX | 3 | ||||
| -rw-r--r-- | Documentation/fmc/fmc-fakedev.txt | 36 |
2 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/fmc/00-INDEX b/Documentation/fmc/00-INDEX index 71304b7fc491..34df5cfc0c41 100644 --- a/Documentation/fmc/00-INDEX +++ b/Documentation/fmc/00-INDEX @@ -24,3 +24,6 @@ mezzanine.txt identifiers.txt - how identification and matching works + +fmc-fakedev.txt + - about drivers/fmc/fmc-fakedev.ko diff --git a/Documentation/fmc/fmc-fakedev.txt b/Documentation/fmc/fmc-fakedev.txt new file mode 100644 index 000000000000..e85b74a4ae30 --- /dev/null +++ b/Documentation/fmc/fmc-fakedev.txt @@ -0,0 +1,36 @@ +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 |