Hello,

On Thu, Dec 17, 2009 at 9:28 PM, Felix Radensky [off-list ref] wr=
ote:

Kumar Gala wrote:

quoted

On Dec 17, 2009, at 2:59 AM, Mahajan Vivek-B08308 wrote:

quoted

quoted

Thanks a lot. If I understand you correctly, the only way I can get
ath9k driver to work on this board using legacy interrupts is to wait =

for a

quoted

quoted

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hardware fix. Right ?

Correct

I'm confused. =A0What's the issue with IRQ0 on the P2020RDB? =A0Is it us=

ed for

quoted

another purpose?

There's a problem with IRQ0 with respect to mini-PCI-E slot. I have Ather=

os

wireless card plugged
into it. ath9k wireless driver for this card uses legacy PCI-E interrupts=

,

and I get "irq 16: nobody cared"
message when driver executes request_irq(). Vivek has come to a conclusio=

n

that the problem is
related to incorrect IRQ0 routing for mini-PCI-E slot on P2020RDB.

I would like to understand this issue better, as I seem to be running
into something similar, and it puts my board design on hold.

Can someone (from Freescale) explain what happens if a PCI Express end
point on the mini-PCIe slot raises a legacy interrupt, and where this
goes wrong?

From what document or source code file can I conclude that the PCIe

legacy interrupt is shared with IRQ0?


I found this:

P1020E/P2020E RDB System Errata, Last Update: 2/15/2010:
Problem:IRQ0 held low
Fix: Add 4.7K pull-up (to 3.3.V) for RTC_INT_N.
See R420 in Rev D schematic.
Add 4.7K pull-up (to 3.3.V) for MCU_INT_N.
See R423 in Rev D schematic.


Regards,
--=20
Leon