From: Michael Lawnick <ml.lawnick-Mmb7MZpHnFY@public.gmane.org>
To: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Cc: Yang Shi <yang.shi-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>,
Linux I2C <linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] MIPS: Octeon: Register EEPROM device on the I2C bus
Date: Fri, 05 Mar 2010 13:15:24 +0100 [thread overview]
Message-ID: <4B90F5DC.90600@gmx.de> (raw)
In-Reply-To: <20100305124200.6f6eccfc-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
Jean Delvare said the following:
> Hi Michael,
>
> On Fri, 05 Mar 2010 12:17:14 +0100, Michael Lawnick wrote:
>> Jean Delvare said the following:
>> > Well, what EEPROM type do you have exactly? 24c64 is for 64 kbit (8
>> > kByte) EEPROMs using 16-bit addressing. You must use the correct type,
>> > otherwise the at24 driver will misbehave. I am a little surprised
>> > because originally you went for "eeprom" which is not compatible with
>> > "24c64" (8-bit vs. 16-bit addressing).
>>
>> Furthermore this brings up another issue:
>> 0x50 typically is SPD-eeprom (DDR initialisation). Corrupting the
>> contents might make your board unbootable - and using a 16bit driver
>> instead of an 8-bit one can corrupt your contents already on
>> (positioned) reading!
>
> This is totally correct, but better said loud to the list and the
> original poster than only privately to me ;)
>
sh.., :-(
next prev parent reply other threads:[~2010-03-05 12:15 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-05 7:08 [PATCH] MIPS: Octeon: Register EEPROM device on the I2C bus Yang Shi
2010-03-05 7:08 ` Yang Shi
[not found] ` <1267772895-25409-1-git-send-email-yang.shi-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2010-03-05 7:11 ` Wolfram Sang
2010-03-05 7:11 ` Wolfram Sang
[not found] ` <20100305071130.GB21925-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-05 7:31 ` Yang Shi
2010-03-05 7:31 ` Yang Shi
[not found] ` <4B90B341.9000601-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2010-03-05 7:41 ` Wolfram Sang
2010-03-05 7:41 ` Wolfram Sang
[not found] ` <20100305074155.GD21925-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2010-03-05 7:53 ` Yang Shi
2010-03-05 7:53 ` Yang Shi
[not found] ` <4B90B888.6060005-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2010-03-05 8:50 ` Jean Delvare
2010-03-05 8:50 ` Jean Delvare
[not found] ` <20100305095040.6ab4612c-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-03-05 10:09 ` Michael Lawnick
2010-03-05 10:09 ` Michael Lawnick
[not found] ` <4B90D85E.6040308-Mmb7MZpHnFY@public.gmane.org>
2010-03-05 10:39 ` Yang Shi
2010-03-05 10:39 ` Yang Shi
[not found] ` <4B90DF48.50005-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
2010-03-05 10:52 ` Jean Delvare
2010-03-05 10:52 ` Jean Delvare
[not found] ` <4B90E83A.5020106@gmx.de>
[not found] ` <4B90E83A.5020106-Mmb7MZpHnFY@public.gmane.org>
2010-03-05 11:42 ` Jean Delvare
[not found] ` <20100305124200.6f6eccfc-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-03-05 12:15 ` Michael Lawnick [this message]
2010-03-08 4:43 ` Yang Shi
2010-03-08 4:43 ` Yang Shi
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