On Wed, 23 Dec 2020, Mark Cave-Ayland wrote:
On 22/12/2020 22:23, BALATON Zoltan via wrote:
I've just remembered that for sam460ex we had this commit: 484ab3dffadc
(sam460ex: Fix PCI interrupts with multiple devices) that changed that
mapping for that machine so I guess you got the exception with the bamboo
board then. I'm not sure though that similar fix is applicable fot that or
even that this fix is correct for sam460ex but appears to work so far.
FWIW you might want to review this commit: as Peter noticed it is possible to
lose interrupts here since if one PCI interrupt is already asserted and then
another comes along, the second PCI interrupt will unintentionally clear the
first which could cause problems.
Yes, thanks for reminding. I think this was also raised back then but for
some reason we thought this should not be an issue in this case but I'll
give it a try and see if using an or-gate would be better. The only
possible IRQ related problem I know about is choppy sound with an emulated
PCI sound card but that may be because some other audio related problem as
well.
Regards,
BALATON Zoltan
You probably want to keep the 4 separate PCI interrupts but feed them into an
OR IRQ, the output of which gets fed into the UIC. Have a look at
https://lists.gnu.org/archive/html/qemu-devel/2020-12/msg05503.html for the
sun4m variant of this based upon Peter's original example.
ATB,
Mark.
