Re: PCI IRQ -MPC8540

Hello all:



Can someone provide me the pointer for the patch for u-boot-1.1.2 to set-up  MPC8540 as an agent correctly.

Thanks
J.Joseph



----- Original Message ----
From: Jin Zhengxiong-R64188 <redacted>
To: agnel juni <redacted>
Sent: Thursday, 18 January, 2007 6:43:55 PM
Subject: RE: PCI IRQ -MPC8540

Message

 
DIV {
MARGIN:0px;}




The comments inline the mail, FYI... 

 

 Ok.

The issue is , for the agent 
driver to route the IRQ, if I understand right ... the PCI(being the host) BIOS 
should assign an IRQ value isn't?.
 

Do you means the 
IRQ value should be write to the 8540 pci config space? If the 8540 card was set 
as agent correctly(there's another patch for the 8540 u-boot to set the agent 
correctly), it's the responsibility of the host to settup it's PCI IRQ. The 
agent should just act like and normal PCI card, such as the ether card.the 
agent just need to generate a interrupt on the IRQ_OUT ping when 
needed.

 
This doesn't happen in our 
case.

When we plug the 8540 card as an agent to the PC host, only in one 
of the slots does the host PC BIOS 
assigns an IRQ value for the card. In others it doesn't.


Try to patch the 
8540 u-boot to set the agent correctly, you can also pay attention to the start 
up sequence of the agent and host, may be you need to stat up the agent u-boot 
first(I can't remember this clearly,just FYI)

  
I am just trying to understand the 
possible reason.

Thanks
J.Joseph



----- 
Original Message ----
From: Jin Zhengxiong-R64188 
[off-list ref]
To: Kumar Gala 
[off-list ref]; agnel juni 
[off-list ref]
Cc: linuxppc-embedded@ozlabs.org
Sent: 
Wednesday, 17 January, 2007 1:34:06 AM
Subject: RE: PCI IRQ -MPC8540

What kinda of interrupt do you want on 

IRQ_OUT/INTA?

- k

On Jan 16, 2007, at 7:54 PM, agnel juni 
wrote:

Yes IRQ_OUT is wired to INTA.

Could you 

please advise on how to generate interrupt for this.

You can refer to a 
Freescale Linux BSP for MPC8540EVAL board. There's a pci agent driver for 
MPC8540, and the corresponding host driver for MPC8560. The agent driver use a 
message interrupt in MPC8540 and redirect the interrupt to IRQ_OUT. As the 
IRQ_OUT is wired to INTA, you can treat MPC8540 as a PCI device.

Jason 
Jin

Thanks
J-

----- Original Message 

----

From: Kumar Gala <redacted>
To: 

agnel juni [off-list ref]

Cc: 

linuxppc-embedded@ozlabs.org

Sent: Tuesday, 16 January, 2007 5:29:01 

PM

Subject: Re: PCI IRQ -MPC8540


On Jan 16, 

2007, at 5:20 PM, agnel juni wrote:

quoted

Hello all:

quoted

I would like to understand if there is a way to program the 

PCI 

quoted

interrupt pin register of MPC8540. I did look for this in the 

quoted

datasheet, but couldn't find any positive answer.

quoted

Currently, I am working in a set-up where MPC8540 is an agent, 

quoted

plugged into the PC host. I couldn't get an IRQ for the card when 

quoted

plugged in some PCI slots, whereas in one of the slots I do see a 

quoted

non-zero value.

It would be great if you 

could help me understand the issue.

quoted

I am sorry if the 

question is inapporpriate in the group. I am 

quoted

desperate to solve 

the issue.

quoted

Thanks for any help.

You 

need to find out how the PCI edge interrupts are wired on you 

board 

than we can talk about how to generate an interrupt based on 

that.  I'd guess IRQ_OUT is wired to INTA, but it would be good to 

verify that.

- k

quoted

J.Joseph

quoted

----- Original Message ----
From: Kumar Gala 

[off-list ref]

quoted

To: Wang Matthew-R59995 

[off-list ref]

quoted

Cc: linuxppc-embedded@ozlabs.org

Sent: Wednesday, 18 October, 2006 6:54:24 PM

quoted

Subject: Re: 

Linuxppc-embedded Digest, Vol 26, Issue 36

quoted

On Oct 18, 2006, at 8:10 PM, Wang Matthew-R59995 wrote:

quoted

quoted

Hi Kumar,

Actually I 

do many trials about it. Vxwerks Bootrom is smaller

than

quoted

U-Boot. The key difference between Bootrom and U-boot is that some 

quoted

source code of Bootrom is invisible to the users.

quoted

quoted

Actually the rfi instruction which I point out is the 

first rfi 

quoted

quoted

instruction of Linux PowerPC bringup.

quoted

quoted

Before that, it's TLB entry invalidation and temp TLB 

entry

mapping.

quoted

quoted

I check MMU setting 

carefully before coming Linux Kernel.

quoted

quoted

I just 

want to know if other guys met similar scenario like me. I 

quoted

quoted

don't need the precise answer, just overall suggestion about it

because 

I

quoted

quoted

understand that not everyone has the same bootloader of 

mine, that 

quoted

quoted

bootloader is actually a customized 

bootloader.

quoted

I understand that, thus I was asking what 

exact problem you were 

quoted

seeing to try and help.

quoted

quoted

Anyway thank you.

R9 

point to LR register, mask the high 20 bit of r9 and send to

r7,

quoted

and

quoted

then add 24, which means stride 6 instructions 

for rfi instruction 

quoted

quoted

execution.

Of course, rfi can switch the TLB entry, both the previous TLB 

quoted

entry and the temp TLB entry point to the same physical 

address.

quoted

quoted

I've checked it.

quoted

I know what the code does, I wrote it :)

- kumar

quoted

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quoted

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quoted

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quoted

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