Re: [PATCH RESEND v3 3/7] Intel MIC Host Driver, card OS statemanagement.

[Sudeep Dutt]

On Thu, 2013-09-05 at 22:01 -0700, Greg Kroah-Hartman wrote:
> On Thu, Sep 05, 2013 at 04:41:55PM -0700, Sudeep Dutt wrote:
> > +What:		/sys/class/mic/mic(x)/firmware
> > +Date:		August 2013
> > +KernelVersion:	3.11
> > +Contact:	Sudeep Dutt <sudeep.dutt@xxxxxxxxx>
> > +Description:
> > +		When read, this sysfs entry provides the path name under
> > +		/lib/firmware/ where the firmware image to be booted on the
> > +		card can be found. The entry can be written to change the
> > +		firmware image location under /lib/firmware/.
> 
> I don't understand, is the path under the HOST device, or the Client
> device's disk?  Why do you need to change the path on the HOST?  What's
> wrong with the existing firmware path selection we have in the kernel?
> 

The path is on the host. The card does not have a physical persistent
disk device. Our customers like the flexibility of changing the card
firmware/ramdisk contents and file names for individual MIC cards. This
flexibility is not possible with a static set of firmware file names in
the kernel for all cards.

Once the firmware/ramdisk path under /lib/firmware/ is set up via sysfs,
card boot is initiated via the "state" sysfs entry. The host driver then
obtains the contents of the firmware and ramdisk via the standard
request_firmware(..) interface, copies the contents to card memory and
interrupts the card BIOS to initiate boot.

Thanks,
Sudeep Dutt


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