From mboxrd@z Thu Jan  1 00:00:00 1970
From: Huang Ying <ying.huang@intel.com>
Subject: RE: [RFC][PATCH]ACPI,APEI,ERST, back end driver for NVRAM
Date: Mon, 21 Nov 2011 08:43:47 +0800
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To: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "lenb@kernel.org" <lenb@kernel.org>, "Luck, Tony" <tony.luck@intel.com>, "Chen, Gong" <gong.chen@intel.com>, Matthew Garrett <mjg@redhat.com>, "dle-develop@lists.sourceforge.net" <dle-develop@lists.sourceforge.net>, Satoru Moriya <satoru.moriya@hds.com>

On Sat, 2011-11-19 at 07:04 +0800, Seiji Aguchi wrote:
> Hi,
> 
> >According to ACPI 4.0a spec:
> >
> >"""
> >17.5.2.4.1 Error Log Address Range Resides in NVRAM
> >
> 
> Thank you for giving me the information.
> Let me clarify one thing.
> 
> If the busy bit can be cleared immediately, we don't need to
> check busy bit with CHECK_BUSY_STATUS.
> So, we should simply execute OSPM operations as follows.
> 
>  - Writing
>    1. BEGIN_WRITE
>    2. SET_RECORD_OFFSET
>    3. EXECUTE_OPERATION
>    4. END
> 
>  - Reading
>    1. BEGIN_READ
>    2. SET_RECORD_OFFSET
>    3. SET_RECORD_ID
>    4. EXECUTE_OPERATION
>    (END operation is not needed because OSPM requires no platform 
>     support to read.)
> 
>  - Clearing
>    1. BEGIN_CLEAR
>    2. SET_RECORD_ID
>    3. EXECUTE_OPERATION
>    (END operation is not needed because OSPM requires no platform 
>     support to clear.)
> 
> Is this what you expected?

No.  I have different understanding.

Because error log address range resides in NVRAM, the contents will be
reserved even after reboot.  So we do not need read/clear operations at
all, and should place all records in error log address range.

Best Regards,
Huang Ying