netdev - RE: [v2,PCI] move ICHx GbE NVM write-protection from e1000e to PCI quirk

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Message-Id: <1226952732.3014.33.camel@achroite>
Date:	Mon, 17 Nov 2008 20:12:11 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Allan, Bruce W" <bruce.w.allan@...el.com>
Cc:	David Miller <davem@...emloft.net>,
	"csnook@...hat.com" <csnook@...hat.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [v2,PCI] move ICHx GbE NVM write-protection from e1000e to PCI
	quirk

On Mon, 2008-11-17 at 12:02 -0800, Allan, Bruce W wrote:
[...]
> Once the NVRAM is write-protected the driver cannot revoke that
> protection, only a system reset will do that.  The kernel command line
> option to disable the write protection is so that if/when a user needs
> to change a value in the NVRAM it can still be done.

Although the ICHx write-protection bit is irreversible without a reset,
it works with SPI flash chips and these normally have their own write-
protection bits that can be switched on and off.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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