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Documentation / fmc / fmc-fakedev.txt

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Based on kernel version 4.13.3. Page generated on 2017-09-23 13:55 EST.

1	fmc-fakedev
2	===========
4	This package includes a software-only device, called fmc-fakedev, which
5	is able to register up to 4 mezzanines (by default it registers one).
6	Unlike the SPEC driver, which creates an FMC device for each PCI cards
7	it manages, this module creates a single instance of its set of
8	mezzanines.
10	It is meant as the simplest possible example of how a driver should be
11	written, and it includes a fake EEPROM image (built using the tools
12	described in *note FMC Identification::),, which by default is
13	replicated for each fake mezzanine.
15	You can also use this device to verify the match algorithms, by asking
16	it to test your own EEPROM image. You can provide the image by means of
17	the eeprom= module parameter: the new EEPROM image is loaded, as usual,
18	by means of the firmware loader.  This example shows the defaults and a
19	custom EEPROM image:
21	     spusa.root# insmod fmc-fakedev.ko
22	     [   99.971247]  fake-fmc-carrier: mezzanine 0
23	     [   99.975393]       Manufacturer: fake-vendor
24	     [   99.979624]       Product name: fake-design-for-testing
25	     spusa.root# rmmod fmc-fakedev
26	     spusa.root# insmod fmc-fakedev.ko eeprom=fdelay-eeprom.bin
27	     [  121.447464]  fake-fmc-carrier: Mezzanine 0: eeprom "fdelay-eeprom.bin"
28	     [  121.462725]  fake-fmc-carrier: mezzanine 0
29	     [  121.466858]       Manufacturer: CERN
30	     [  121.470477]       Product name: FmcDelay1ns4cha
31	     spusa.root# rmmod fmc-fakedev
33	After loading the device, you can use the write_ee method do modify its
34	own internal fake EEPROM: whenever the image is overwritten starting at
35	offset 0, the module will unregister and register again the FMC device.
36	This is shown in fmc-write-eeprom.txt
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