From: Horms <horms@verge.net.au>
To: linux-ia64@vger.kernel.org
Subject: Re: [Fastboot] Some PCI devices do not handle kexec reboot nicely
Date: Wed, 13 Dec 2006 02:58:50 +0000 [thread overview]
Message-ID: <20061213025848.GH22902@verge.net.au> (raw)
On Mon, Dec 11, 2006 at 04:18:12PM -0800, Jay Lan wrote:
> We found in testing that certain PCI devices don't handle the
> kexec'ed kernel reboot gracefully on IA64 Altix. Some GbE card
> would get into a bad state permanently after one reboot, and
> resulted in MCA on the machines when booting kexec'ed kernel
> thereafter. The MCA was a result of a PIO read to the Expansion
> ROM of the card. We also saw a USB card issuing stale DMA's
> which was queued up prior to the kexec reboot.
>
> Do you observe similar problems on other platforms? Are the drivers
> supposed to reset the cards when it re-attach to the card on
> the kexec reboot?
I think that the simple answer to that is yes.
However isn't it the case that this simply isn't possible for some
hardware? There was talk of passing a boot parameter to the second
kernel so it knew it was a second kernel and drivers could take
evasive action as needed. I'm not sure what happened to that idea.
--
Horms
H: http://www.vergenet.net/~horms/
W: http://www.valinux.co.jp/en/
reply other threads:[~2006-12-13 2:58 UTC|newest]
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