linux-kernel - Re: [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable hardirqs

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Message-ID: <48678B72.4000706@ru.mvista.com>
Date:	Sun, 29 Jun 2008 17:17:38 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	avorontsov@...mvista.com, Ingo Molnar <mingo@...e.hu>,
	linux-ide@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: [PATCH v2 -rt] ide: workaround buggy hardware issues with preemptable
 hardirqs

Alan Cox wrote:

>>   His boot log shows the native mode.

> Then the bridge is misprogrammed

>>   What's IDEIRT, some ISA bridge register? And why should one set 
>>[A]PIC to level mode for legacy mode IDE? :-O

> You need an NDA and then they'll send you the data sheet for the bridges
> and other logic. It's all programmable.

    That could be a very long story... :-|

> "He has an OpenPIC, it's PowerPC SoC, so no ELCR either"

> Really - he's using a designed for PC ISA bridge etc.. he might have all
> sorts of stuff on it.

   Ah, indeed. I meant to say that 8259 and ELCR are bypassed for PCI IRQs (or 
at least Anton says so :-).

> Alan

MBR, Sergei
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