Re: PCI DMA in GT64260

Thank you.
I check the GPP Pins and test that pins with osciloscope.
At the time when CPU commands to the L2 S/W chip that
'transmit data', L2 S/W chip asserts PCI_REQ* signal(this is connected
to GPP pin) and GT64260 alos asserts PCI_GNT* signal(also this pin is
connected to GPP pin). and L2 S/W chip also asserts PCI_FRAME*
signal. So I think GPP setting is no problem.

I think that the value of BAR Regs in GT64260 Config Space is wrong,
so I try to change the value with PCI_CONFIG_ADDR, PCI_CONFIG_DATA,
when I scan PCI Bus, in bus no 0 or 1, dev no 0, I found GT64260 PCI Bridge,
But I cannot change the value of BAR in PCI CONFIG Space.
How can I change the value of BAR in PCI CONFIG Space.

another is,
you say that there are several working examples.
But I can't found any examples related to PCI_DMA or
changing the value of BAR in PCI CONFIG Space.

please let me know how to solve the PCI DMA
----- Original Message -----
From: "Mark A. Greer" <redacted>
To: "신경수" <redacted>
Cc: <redacted>
Sent: Friday, September 26, 2003 9:58 AM
Subject: Re: PCI DMA in GT64260

신경수 wrote:

quoted

Thank you for your response.

Well, Instead of giving my all code, I give the register lists and the value
related to address decoding. please check the register and the value.

Well, there are several working examples that you can look at so I'm not
going to spend much time groping through registers. However, from what
you describe, I would guess that you have either a PCI arbitration
problem or your PCI slave window is horked. I did a very quick look at
the PCI slave windows & related regs and I didn't notice anything
wrong--that doesn't mean there isn't--so it may be an arbitration problem.

Are you using the 64260's PCI arbiter or do you have an external one? If
64260, then make sure that its configured correctly and that you have
the appropriate GPP pins configured correctly. Again, several working
examples so don't be shy about looking at them.

Mark

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