I have a Alpha PWS 600au with an onboard Qlogic isp1020 controller and a
pci Qlogic isp1020 controller. The redhat version 6.1 and 6.2 boot images
do not detect the onboard controller. Previously I had redhat 6.0
installed on the system. I installed it using the boot images found at
ftp://ftp.digital.com/pub/DEC/Linux-Alpha/Images. The 2.2.12 kernel on
that disk is able to recognize both controllers. I am able to install
redhat 6.2 from that disk. However when rebooting after the install, the
stock kernel (2.2.14-6.0) that comes with redhat 6.2 does not boot.
Actually it boots but cannot mount the root fs because it has not
recognized the onboard scsi card.
This all occurs even if I remove the pci qlogic controller.
I did not see am updated boot.img from ftp://updates.redhat.com
I have tried the RawHide kernel update 2.2.14-100 and it still does not detect
the onboard scsi adaptor. I upgraded to the 2.2.15 kernel. It detected both
scsi adaptors but I then got a keyboard timeout  error. But the scsi
adaptors were detected just fine. Is there a fix the the keyboard timeout 
problem. I searched the newsgroups and found a few people with that problem
but no answer to it.
I am unable to reproduce this problem in our test lab using 6.2 ...
% lspci ; lspci -n
01:06.0 SCSI storage controller: Q Logic ISP1020 (rev 06)
01:06.0 Class 0100: 1077:1020 (rev 06)
qlogicisp : new isp1020 revision ID (6)
DC390: 0 adapters found
scsi0 : QLogic ISP1020 SCSI on PCI bus 01 device 30 irq 47 I/O base 0x100009800
scsi : 1 host.
Vendor: DEC Model: RZ2DC-KA (C) DEC Rev: 5520
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
scsi : detected 1 SCSI disk total.
SCSI device sda: hdwr sector= 512 bytes. Sectors= 17773524 [8678 MB] [8.7 GB]
sda: sda1 sda2
I just upgraded the the 2.2.16-3 kernel and both cards show up fine.