[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <1321836227.13860.121.camel@yhuang-dev>
Date: Mon, 21 Nov 2011 08:43:47 +0800
From: Huang Ying <ying.huang@...el.com>
To: Seiji Aguchi <seiji.aguchi@....com>
Cc: "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"lenb@...nel.org" <lenb@...nel.org>,
"Luck, Tony" <tony.luck@...el.com>,
"Chen, Gong" <gong.chen@...el.com>,
Matthew Garrett <mjg@...hat.com>,
"dle-develop@...ts.sourceforge.net"
<dle-develop@...ts.sourceforge.net>,
Satoru Moriya <satoru.moriya@....com>
Subject: RE: [RFC][PATCH]ACPI,APEI,ERST, back end driver for NVRAM
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists