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Re: [Qemu-devel] [PATCH 3/3] hw: correctly implement soft reset
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 3/3] hw: correctly implement soft reset |
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Date: |
Tue, 05 Mar 2013 18:43:42 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
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
[Qemu-devel] [PATCH 2/3] pc: port 92 reset requires a low->high transition, Paolo Bonzini, 2013/03/05
[Qemu-devel] [PATCH 3/3] hw: correctly implement soft reset, Paolo Bonzini, 2013/03/05
Re: [Qemu-devel] [PATCH 0/3] Implement x86 soft reset, David Woodhouse, 2013/03/05
[Qemu-devel] [PATCH 4/3] wakeup: only reset the CPU, Paolo Bonzini, 2013/03/05
Re: [Qemu-devel] [PATCH 4/3] wakeup: only reset the CPU, Laszlo Ersek, 2013/03/05