Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Thu, 9 Aug 2018 23:07:31 -0700

On 08/09/2018 10:18 PM, Jörn Dreyer wrote:
> Hi Steve,
> 
> Am Donnerstag, 9. August 2018, 17:21:05 CEST schrieb Steve Kinder - UKRI STFC:
> 
>> I got compilation errors when trying to make the 3-0-0 driver. Since it
>> should work with my IOC and a PCIe-EVR-300DC, and the driver with 2-2-0
>> builds, I have gone over to mrfioc2 2-2-0 for this. I still get the
>> original STACKPOINTER message on installation but the driver is copied to
>> /lib/modules/`uname -r`/extra so I think that's all ok?
>>
>>
>> I executed 'depmod -a', 'modprobe mrf' and rebooted.
> ------------------------------------------------------------^^^^^^^^^^^^
> 
> Here is your problem. The "modprobe mrf" loads the module into the kernel, and 
> the reboot of course removes it again. It will not automatically be loaded 
> after boot. You will have to do the "modprobe mrf" each time the system gets 
> rebooted.

In fact, recent versions export the supported PCI ID table (cf. MODULE_DEVICE_TABLE).
This is what allows linux module autoloading to work.  The "depmod" step is what sets this up.

https://github.com/epics-modules/mrfioc2/blob/master/mrmShared/linux/uio_mrf.c#L762

These are the "alias" lines shown by 'modinfo'.

> $ /sbin/modinfo mrmShared/linux/mrf.ko
> filename:       /home/mdavidsaver/work/timing/mrfioc2/mrmShared/linux/mrf.ko
> author:         Michael Davidsaver <[email protected]>
> version:        1
> license:        GPL v2
> srcversion:     E3290AD048B5B57D2EAA55E
> alias:          pci:v000010EEd00007011sv00001A3Esd0000232Cbc*sc*i*
> alias:          pci:v000010EEd00007011sv00001A3Esd0000132Cbc*sc*i*
> alias:          pci:v00001A3Ed0000152Csv00001A3Esd0000152Cbc*sc*i*
> alias:          pci:v00001A3Ed0000252Csv00001A3Esd0000252Cbc*sc*i*
> alias:          pci:v000010EEd00007011sv00001A3Esd0000172Cbc*sc*i*
> alias:          pci:v00001204d0000EC30sv00001A3Esd0000172Cbc*sc*i*
> alias:          pci:v000010B5d00009056sv00001A3Esd0000192Cbc*sc*i*
> alias:          pci:v000010B5d00009030sv00001A3Esd000011E6bc*sc*i*
> alias:          pci:v000010B5d00009030sv00001A3Esd000020E6bc*sc*i*
> alias:          pci:v000010B5d00009030sv00001A3Esd000020DCbc*sc*i*
> alias:          pci:v000010B5d00009030sv00001A3Esd000010E6bc*sc*i*
> depends:        parport,uio
> retpoline:      Y
> name:           mrf
> vermagic:       4.16.0-0.bpo.2-amd64 SMP mod_unload modversions 
> parm:           cable:Name of JTAG parallel port cable to emulate (charp)
> parm:           interfaceversion:User space interface version (int)
> parm:           use_msi:Use MSI if present (default 1, yes) (uint)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System