linux-kernel - Re: [PATCHv3 07/11] USB: gadget: g_multi: added documentation and INF files

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Date:	Thu, 3 Jun 2010 13:16:24 +0800
From:	Xiaofan Chen <xiaofanc@...il.com>
To:	Michał Nazarewicz <m.nazarewicz@...sung.com>
Cc:	linux-usb@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org,
	"mina86@...a86.com" <mina86@...a86.com>
Subject: Re: [PATCHv3 07/11] USB: gadget: g_multi: added documentation and INF 
	files

2010/6/3 Xiaofan Chen <xiaofanc@...il.com>:
> 2010/6/2 Michał Nazarewicz <m.nazarewicz@...sung.com>:
>> On Wed, 02 Jun 2010 15:02:54 +0200, Xiaofan Chen <xiaofanc@...il.com> wrote:
>>>
>>> [Version]
>>> Signature="$Windows NT$"
>>> Class=Ports
>>> ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
>>> Provider=%MFGNAME%
>>> LayoutFile=layout.inf
>>> CatalogFile=%MFGFILENAME%.cat
>>
>> So, what is this cat file for?  I changed the IDs and the INF file started
>> working even though I expected that this file will be required.  I'm
>> wondering is it because I have something installed on my Windows
>> box that others may miss?
>
> You do not need the cat file in this case. Microchip's Driver Package is
> WHQLed, in that case, the cat file will have the necessary
> digital certificate (Verisign Class 3 code signing certificate for WHQL).
> You can also sign your driver package with other valid certificates
> (GlobalSign) for KMCS requirement. In this case, the kernel driver
> is already signed by Microsoft, you do not need the signed driver
> package (cat file) to load the driver in 64bit Vista/Win7. But there
> will be a warning (for 32bit/64bit XP/Vista/Win7). Once you pay
> money and go through WHQL process, the warning will not be there.
>
> In a word, that line can be deleted.

Just hope the Linux USB developers will not be bored by this kind
of Windows specific information.

Here is the nice writeup by Microsoft about KMCS.
http://www.microsoft.com/whdc/driver/install/drvsign/kmcs-walkthrough.mspx

So if your employer (Samsung) or others is quite nice and submit the
driver package (the inf and cat file for CDC-ACM) for WHQL and got
approved, in the future, uses of the inf file will not see the red color
warning. This might be desired for corporate customers.

BTW, I am one of the admins of the open source libusb-win32 project.
Actually we want to get some donations to sign the kernel libusb0.sys
driver so that it can work under 64bit Vista/Win7. Therefore I came
to know a bit of the things.

>> And what's with the layout.inf.
> Ah, I think that should not be there now. Only system provided
> INF file should have that line (eg: mdmcpq.inf which is included
> in the INF file). You can remove that line.
>
> More information:
> http://support.microsoft.com/kb/837637
>



-- 
Xiaofan http://mcuee.blogspot.com
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