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Date:	Wed, 03 Oct 2007 14:15:56 -0400
From:	Jeff Garzik <>
To:	Olof Johansson <>
Subject: Re: [PATCH] [9/11] pasemi_mac: clear out old errors on interface

Olof Johansson wrote:
> On Wed, Oct 03, 2007 at 01:46:16PM -0400, Jeff Garzik wrote:
>> Olof Johansson wrote:
>>> pasemi_mac: clear out old errors on interface open
>>> Clear out any pending errors when an interface is brought up. Since the 
>>> bits
>>> are sticky, they might be from interface shutdown time after firmware has
>>> used it, etc.
>>> Signed-off-by: Olof Johansson <>
>> In general, interface-open should completely reset and initialize the 
>> hardware.  does pasemi_mac not do that?
> There's no explicit way to reset just one interface besides disabling it
> (which we do at close, and re-enable at open). It seems that some of
> the error bits are sticky across disable/enable, which is why this was
> needed. Also, they're RW1C, so writing 0 doesn't remove them (need to
> write 1 to clear).

OK just making sure, thanks.

> The only other dependency from firmware at this time is the setting of mac
> addresses, something that will be taken care of once we allow override of
> them via ethtool, since we'd need to program them from the driver then
> no matter what. Right now we assume that firmware has programmed it.

Standard procedure for this is

* upon module-load, obtain the MAC address from <whatever canonical source>
* upon interface-up, program dev->dev_addr[] into chip's RX filter (aka 
MAC address) registers

That permits the admin to override the MAC address via ifconfig. 
(ethtool doesn't support that, but you basically had the right idea)


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