Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset

[Blue Swirl]

On Sun, Oct 2, 2011 at 7:44 PM, Avi Kivity <address@hidden> wrote:
>> >
>> > A real device also ignores inputs during reset (or if it doesn't,
>> > we can just emulate that).
>>
>> Maybe this could work:
>> 1 - issue start of reset cycle (raise qemu_irq, unrealize): internal
>> states reset, no I/O.
>> 2 - issue start of I/O, reset held (new phase): evaluate inputs and
>> post outputs, but consider also that reset is still active, so
>> transition is not complete for all devices
>
> This doesn't correspond to real hardware.   Each device detects the reset 
> edge independently.  There is no signal that says "all devices have seen the 
> edge".

Reset is not edge triggered but level signal.

> We should either have just 1, or merge 1 and 2.
>

Then we'd be back to where the problems started.