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From: Alexander Motin <mav@FreeBSD.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] AHCI Port Interrupt Enable register cleaning on soft reset
Date: Sun, 11 Sep 2011 17:43:59 +0300	[thread overview]
Message-ID: <4E6CC92F.30407@FreeBSD.org> (raw)

Hi.

I've found that FreeBSD AHCI driver doesn't work with AHCI hardware
emulation of QEMU 0.15.0. I believe the problem is on QEMU's side. As I
see, it clears port's Interrupt Enable register each time when reset of
any level happens. Is is reasonable for the global controller reset. It
is probably not good, but acceptable for FreeBSD driver for the port
hard reset. But it is IMO wrong for the device soft reset. None of real
hardware I know behaves that way.

This patch fixes the problem for me:
http://people.freebsd.org/~mav/qemu.ahci.patch

-- 
Alexander Motin

             reply	other threads:[~2011-09-11 14:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-11 14:43 Alexander Motin [this message]
2011-09-11 20:37 ` [Qemu-devel] AHCI Port Interrupt Enable register cleaning on soft reset Alexander Graf
2011-09-12  8:19   ` Alexander Motin
2011-09-19 10:36     ` Kevin Wolf

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