linux-kernel - Re: e1000e NVM corruption issue status

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Date:	Sat, 27 Sep 2008 00:04:25 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Tim Gardner <timg@....com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Jiri Kosina <jkosina@...e.cz>,
	"Brandeburg\, Jesse" <jesse.brandeburg@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, agospoda@...hat.com,
	"Ronciak\, John" <john.ronciak@...el.com>,
	"Allan\, Bruce W" <bruce.w.allan@...el.com>,
	"Graham\, David" <david.graham@...el.com>, kkiel@...e.de,
	tglx@...utronix.de, chris.jones@...onical.com,
	arjan@...ux.jf.intel.com
Subject: Re: e1000e NVM corruption issue status

Tim Gardner <timg@....com> writes:

> I've been experimenting with unmapping flash space until its actually
> needed, e.g., in the functions that use the E1000_READ_FLASH and
> E1000_WRITE_FLASH macros. Along the way I looked at how flash write
> cycles are initiated because I was having a hard time believing that
> having flash space mapped was part of the root cause. However, it looks
> like its pretty simple to initiate a write or erase cycle. All of the
> required action bits in ICH_FLASH_HSFSTS and ICH_FLASH_HSFCTL must be 1,
> and these 2 register are in the correct order if X was writing 0xff in
> ascending order.

But... do you really have a flash chip there? I think it's more about
EEPROM (a serial usually 8-pin small chip, keeping the MAC address and
hardware configuration). Flash chips are used for diskless booting
(though corrupting them can make the machine unbootable of course).

Sure, writing to a parallel flash chip is easy, much easier than to
serial EEPROM.
-- 
Krzysztof Halasa
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