linux-kernel - Re: [PATCHv3 5/6] dt-bindings: fpga: add authenticate-fpga-config property

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Date:   Tue, 26 Jan 2021 07:58:23 -0600
From:   Richard Gong <richard.gong@...ux.intel.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     trix@...hat.com, gregkh@...uxfoundation.org,
        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: [PATCHv3 5/6] dt-bindings: fpga: add authenticate-fpga-config
 property



On 1/25/21 11:05 PM, Moritz Fischer wrote:
> On Mon, Jan 25, 2021 at 02:56:27PM -0600, richard.gong@...ux.intel.com wrote:
>> From: Richard Gong <richard.gong@...el.com>
>>
>> Add authenticate-fpga-config property for FPGA bitstream authentication,
>> which makes sure a signed bitstream has valid signatures.
>>
>> Signed-off-by: Richard Gong <richard.gong@...el.com>
>> ---
>> v3: no change
>> v2: put authenticate-fpga-config above partial-fpga-config
>>      update commit messages
>> ---
>>   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..d0d3234 100644
>> --- a/Documentation/devicetree/bindings/fpga/fpga-region.txt
>> +++ b/Documentation/devicetree/bindings/fpga/fpga-region.txt
>> @@ -182,6 +182,7 @@ Optional properties:
>>   	This property is optional if the FPGA Manager handles the bridges.
>>           If the fpga-region is  the child of a fpga-bridge, the list should not
>>           contain the parent bridge.
>> +- authenticate-fpga-config : boolean, set if do bitstream authentication only.
> I don't understand. Can I do authenticate-fpga-config AND
> partial-fpga-config?

Yes, but not simultaneously.

Flag authenticate-fpga-config is used to first check the integrity of 
the bitstream. If the authentication passes, the user can perform a full 
or partial configuration to actually configure the bistream to device.

>>   - partial-fpga-config : boolean, set if partial reconfiguration is to be done,
>>   	otherwise full reconfiguration is done.
>>   - external-fpga-config : boolean, set if the FPGA has already been configured
>> -- 
>> 2.7.4
>>
> Please clarify,
> 
> Moritz
> 
Regards,
Richard