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In the example below, given for an AlphaServer 4100, we can see the controller ace0 has an invalid slot number for pci0 (eisa0) according to the Placement of peripheral devices on PCI bus for AlphaServer4100 (8 PCI slots) table (slot 4 belongs to pci1):

# cat /sys/conf/AXP001

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bus             isp0       at pci1     slot  1 vector   ispintr

controller      scsi0      at isp0     slot  0

bus             pci0       at mcbus0   slot  4

bus             eisa0      at pci0     slot  1

callout after_c "../bin/mkdata eisa"

controller      gpc0       at eisa0    slot  0 vector   gpcintr

controller      ace0       at eisa0    slot  4 vector   aceintr

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We'll replace then 4 by 8 (correct number for all models) to correct this

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# vi /sys/conf/AXP001

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controller      ace0       at eisa0    slot  48 vector   aceintr

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so the result will be:

# cat /sys/conf/AXP001

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controller      ace0       at eisa0    slot  8 vector   aceintr

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