linux-kernel - Re: [PATCHv1 3/4] dt-bindings: fpga: add authenticate-fpga-config property

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Message-ID: <083f5b49-5519-e15a-a16f-c0fc38aba15b@linux.intel.com>
Date:   Mon, 16 Nov 2020 07:59:13 -0600
From:   Richard Gong <richard.gong@...ux.intel.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     trix@...hat.com, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, dinguyen@...nel.org,
        sridhar.rajagopal@...el.com, Richard Gong <richard.gong@...el.com>
Subject: Re: [PATCHv1 3/4] dt-bindings: fpga: add authenticate-fpga-config
 property


Hi Moritz,


On 11/15/20 1:21 PM, Moritz Fischer wrote:
> Hi Richard,
> 
> On Thu, Nov 12, 2020 at 12:06:42PM -0600, richard.gong@...ux.intel.com wrote:
>> From: Richard Gong <richard.gong@...el.com>
>>
>> Add authenticate-fpga-config property for FPGA bitstream authentication.
>>
>> Signed-off-by: Richard Gong <richard.gong@...el.com>
>> ---
>>   Documentation/devicetree/bindings/fpga/fpga-region.txt | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/devicetree/bindings/fpga/fpga-region.txt b/Documentation/devicetree/bindings/fpga/fpga-region.txt
>> index e811cf8..7a512bc 100644
>> --- a/Documentation/devicetree/bindings/fpga/fpga-region.txt
>> +++ b/Documentation/devicetree/bindings/fpga/fpga-region.txt
>> @@ -187,6 +187,7 @@ Optional properties:
>>   - external-fpga-config : boolean, set if the FPGA has already been configured
>>   	prior to OS boot up.
>>   - encrypted-fpga-config : boolean, set if the bitstream is encrypted
>> +- authenticate-fpga-config : boolean, set if do bitstream authentication
> It is unclear to me from the description whether this entails
> authentication + reconfiguration or just authentication.
> 
> If the latter is the case this should probably be described as such.

It is for authentication only, just make the signed bitstream has the 
valid signatures.

Regards,
Richard

> 
>>   - region-unfreeze-timeout-us : The maximum time in microseconds to wait for
>>   	bridges to successfully become enabled after the region has been
>>   	programmed.
>> -- 
>> 2.7.4
>>
> 
> Thanks
>