Re: [PATCH 0/2] fix libata-sff and pata_cmd64x to not crash on boot on parisc

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Hello.

On 19-04-2011 1:20, Alan Cox wrote:

+	}
+	if (!(reg&  ENPORT_SECONDARY)) {
+		dev_printk(KERN_NOTICE,&pdev->dev, "Secondary port is disabled\n");
+		ppi[1] =&ata_dummy_port_info;
+	}

And you just broke split bridge setups. Also need to check if the bits
are valid for this chipset in native mode officialy - Sergei probably
knows the answer to that.

The PCI-649 spec. doesn't say anything about legacy/native mode WRT the channel enable bits.

We can detect the Mobility electronics split bridges at least (and I
suspect they are the only 'common' CMD64x hot plug device indeed possibly
the only one) because the parent bridge of the CMD64x will have a PCI
vendor id of 0x14f2 and a device id 0x0001, 0x0002, or 0x0120.

What's the issue with these brodges anyway? Why the enable bits are not valid for them?

WBR, Sergei
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