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Subject: Re: reading/writing CMOS beyond 256 bytes?
To: grisha@ispol.com ("Gregory (Grisha) Trubetskoy")
Date: Fri, 6 Jul 2001 16:07:04 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <Pine.BSF.4.32.0107060829460.47924-100000@localhost> from "Gregory (Grisha) Trubetskoy" at Jul 06, 2001 08:38:12 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Unfortunately, it seems that some settings are not in the 128 (or 256)
> bytes accessible this way, so they must be stored elsewhere.

Large numbers of BIOS settings are in the NVRAM ESCD area in modern systems
(EISA config, ISAPNP config, etc)

> Does anyone know where I should look for the remaining parts of CMOS
> (short of having to sign some NDA with Intel?)?

The PnPBIOS and ESCD specs are publically available if a little impenetrable

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