Re: usb/gadget: file_storage booting flexible mode page

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On Wed, 17 Mar 2010, Miika Keskinen wrote:

> Hi,
> 
> I'm toying with net2272 and g_file_storage. My Intention is to boot a
> x86 machine from file_storage gadget. Some machines do boot fine and
> other won't (they do boot from an usb-stick anyways and if booted up,
> the file_storage does function just fine). Usb_msc_boot_1.0.pdf section
> 4.1.1 (flexible disk mode page) does state that:
> 
> --
> Support for the Flexible Disk Mode Page is required for all devices with
> a Peripheral Device Type other
> than 05h. The FDMP provides the geometry that is necessary for
> translating a CHS address to a SCSI
> standard logical block address.
> --
> 
> I haven't have time yet to implement that into a file_storage and see if
> it makes a difference, but I'm asking if any of you have had similar
> problems and/or have some ideas what might be wrong?

You can get more information about what's going wrong if you enable
verbose debugging in file_storage.c (uncomment the #define near the
start of the file).  Then you'll be able to see if the gadget receives
a MODE SENSE command for that page.

Alan Stern

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