linux-kernel - Re: [PATCH 0/2] Add iProc IDM device support

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Message-ID: <bd90ba80-9aac-e406-9066-64e975e5b10b@broadcom.com>
Date:   Mon, 9 Dec 2019 10:02:53 -0800
From:   Ray Jui <ray.jui@...adcom.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] Add iProc IDM device support



On 12/7/19 9:39 AM, Marc Zyngier wrote:
> On Mon,  2 Dec 2019 15:31:25 -0800
> Ray Jui <ray.jui@...adcom.com> wrote:
> 
>> The Broadcom iProc IDM device allows control and monitoring of ASIC internal
>> bus transactions. Most importantly, it can be configured to detect bus
>> transaction timeout. In such case, critical information such as transaction
>> address that caused the error, bus master ID of the transaction that caused
>> the error, and etc., are made available from the IDM device.
> 
> This seems to have many of the features of an EDAC device reporting
> uncorrectable errors.
> 
> Is there any reason why it is not implemented as such?
> 
> Thanks,
> 
> 	M.
> 

I thought EDAC errors (in fact, in our case, that's fatal rather than 
uncorrectable) are mostly for DDR. Is my understanding incorrect?

Thanks,

Ray