On 19/12/2020 11:19, Mark Cave-Ayland wrote:
The sun4m board code connects both of the IRQ outputs of each ESCC to the
same slavio input qemu_irq. Connecting two qemu_irqs outputs directly to the
same input is not valid as it produces subtly wrong behaviour (for instance
if both the IRQ lines ar
сб, 19 дек. 2020 г., 12:19 Mark Cave-Ayland :
> The sun4m board code connects both of the IRQ outputs of each ESCC to the
> same slavio input qemu_irq. Connecting two qemu_irqs outputs directly to
> the
> same input is not valid as it produces subtly wrong behaviour (for instance
> if both the IRQ
The sun4m board code connects both of the IRQ outputs of each ESCC to the
same slavio input qemu_irq. Connecting two qemu_irqs outputs directly to the
same input is not valid as it produces subtly wrong behaviour (for instance
if both the IRQ lines are high, and then one goes low, the PIC input wil
