Subject: Re: MPC83xx ipic problem

From: André Schwarz <[email-masked]>
Date: Tue, 01 Jul 2008 09:45:34 +0200

Scott,

thanks for your reply.

Honestly I don't think the board wiring is incorrect.
FPGA goes to IRQ0 and miniPCI is wired to IRQ1.

Maybe there's a crosstalk problem since the pull-up resistors are=20
packaged inside an array ... I'll check this.

regards,
Andr=C3=A9

Scott Wood schrieb:
> Andr=C3=A9 Schwarz wrote:
>> There are two external PCI devices connected (FPGA + miniPCI socket).
>> The FPGA is working fine and uses IRQ0 for its PCI_INTA line.
>>
>> As soon there's a miniPCI module present and the driver loaded=20
>> (actually an ath5k WiFi module) the system complains after a while :
>>
>> irq 48: nobody cared
>> handlers: .... location of the FPGA irq handler
>> Disabling IRQ #48
>>
>> -> This is weird since the FPGA isn't working at all and IRQ0 is *not*=
=20
>> asserted !
>=20
> Are you *sure* that IRQ0 isn't asserted?  The IPIC seems to think it is=
.
>=20
>> Of course the miniPCI irq is routed to a different pin on the CPU (IRQ=
1).
>=20
> Perhaps the board wiring is incorrect?
>=20
>> interrupt-map =3D <0x5800 0 0 1 &ipic 0x30 0x8      -> FPGA @ IRQ0
>>                  0x6000 0 0 1 &ipic 0x11 0x8      -> miniPCI INTA @ IR=
Q1
>>                  0x6000 0 0 2 &ipic 0x11 0x8>;    -> miniPCI INTB @ IR=
Q1
>>
>> Is it legal to use a single irq pin twice ?
>=20
> Yes.
>=20
> -Scott
>=20
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