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From: Gabor Kerenyi <wom@tateyama.hu>
To: linux-kernel@vger.kernel.org
Subject: unconfigure PCI dev
Date: Tue, 23 Apr 2002 11:28:09 +0900
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Message-Id: <200204231128.09461.wom@tateyama.hu>
Sender: linux-kernel-owner@vger.kernel.org

hi!

I've got a strange problem.

I'm writing a driver for a PCI card.
The card has a problem because the serial eeprom where the pci configuration 
data is loaded from is not valid and therefore the PLX-9050 chip gives some 
default value. It shows vendor:devid as 10b5:9050 and the kernel identifies 
it as a PLX PCI <-> IOBus Bridge. (kernel 2.5.7)

The serial eeprom can be read written at 50h in the local config area.
When I load my driver and it wants to request a memory region it seems that it 
is already mapped. (I modified the driver to look for 0x10b5:9050)

So it fails. 

The cat /proc/pci shows a memory region at 0xf4200000. 

int plc_init_dev1(struct pci_dev *dev)
{
	printk("%x\n", pci_resource_start(dev, 0);
	return -EBUSY;
	if (check_mem_region(pci_resource_start(dev, 0), 128))
		return -EBUSY;
}

So why is it already in use?
I have to access that memory area. How can I do it if my driver doesn't load?
That's the only way to modify the eeprom contents.

Thanks.

Gabor

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