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Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset |
Date: |
Sun, 2 Oct 2011 20:30:33 +0000 |
On Sun, Oct 2, 2011 at 8:21 PM, Avi Kivity <address@hidden> wrote:
>> >
>> > What I'm saying is that RESET order isn't defined on real hardware
>> > either, due to signal propagation effects.
>>
>> Yes, but there the millions of reset cycles help immensely to
>> suppress
>> the effects.
>>
>
> That's modeled correctly. After the end of phase 1, everything is settled.
> During phase 1, you can see some spikes, but you can see them on real
> hardware as well.
No. With two phase reset (like I understood it), at the beginning of
phase, everything internal is settled (registers reset), no I/O. After
the phase 1, starting the external I/O activities cause spikes but
these are not suppressed.
In my 3-phase version, the reset would be held during phase 2 just to
handle the spikes (registers continue to be reset as needed).
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, (continued)
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset,
Blue Swirl <=
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02