From: Paolo Bonzini <pbonzini@redhat.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: aliguori@us.ibm.com, lersek@redhat.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 3/3] hw: correctly implement soft reset
Date: Tue, 05 Mar 2013 18:43:42 +0100 [thread overview]
Message-ID: <51362ECE.6050208@redhat.com> (raw)
In-Reply-To: <1362504126.32301.19.camel@i7.infradead.org>
Il 05/03/2013 18:22, David Woodhouse ha scritto:
> On Tue, 2013-03-05 at 16:04 +0100, Paolo Bonzini wrote:
>> > Do not do a hard reset for port 92h, keyboard controller, or cf9h soft
>> > reset. These only reset the CPU.
> Is a keyboard reset also supposed to reset the A20 gate?
Resetting with 0xFE is not supposed to reset the A20 gate.
Resetting with 0xD1 will set the A20 gate to whatever value you place in
the data byte. (Also, resetting with 0xD1 for what I could find does
not have the same edge-triggered behavior as port 92).
Paolo
next prev parent reply other threads:[~2013-03-05 17:43 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-05 15:04 [Qemu-devel] [PATCH 0/3] Implement x86 soft reset Paolo Bonzini
2013-03-05 15:04 ` [Qemu-devel] [PATCH 1/3] cpu: make CPU_INTERRUPT_RESET available on all targets Paolo Bonzini
2013-03-05 15:38 ` Anthony Liguori
2013-03-05 16:10 ` Andreas Färber
2013-03-05 16:17 ` Paolo Bonzini
2013-03-05 18:00 ` Laszlo Ersek
2013-03-05 15:04 ` [Qemu-devel] [PATCH 2/3] pc: port 92 reset requires a low->high transition Paolo Bonzini
2013-03-05 17:20 ` Anthony Liguori
2013-03-05 18:05 ` Laszlo Ersek
2013-03-05 15:04 ` [Qemu-devel] [PATCH 3/3] hw: correctly implement soft reset Paolo Bonzini
2013-03-05 17:18 ` Anthony Liguori
2013-03-05 17:22 ` David Woodhouse
2013-03-05 17:43 ` Paolo Bonzini [this message]
2013-03-05 18:32 ` Laszlo Ersek
2013-03-05 15:51 ` [Qemu-devel] [PATCH 0/3] Implement x86 " David Woodhouse
2013-03-05 16:00 ` Paolo Bonzini
2013-03-05 16:13 ` Andreas Färber
2013-03-05 16:03 ` [Qemu-devel] [PATCH 4/3] wakeup: only reset the CPU Paolo Bonzini
2013-03-05 16:59 ` David Woodhouse
2013-03-05 17:10 ` Paolo Bonzini
2013-03-05 17:26 ` Peter Stuge
2013-03-05 17:42 ` Paolo Bonzini
2013-03-05 19:12 ` Laszlo Ersek
2013-03-05 19:25 ` Paolo Bonzini
2013-03-05 19:51 ` Laszlo Ersek
2013-03-06 1:45 ` Kevin O'Connor
2013-03-06 8:32 ` David Woodhouse
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