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port-hp300/54255: Support SGC graphics in any slot in hp300 system

>Number:         54255
>Category:       port-hp300
>Synopsis:       Support SGC graphics in any slot in hp300 system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-hp300-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 31 20:45:00 +0000 2019
>Originator:     Chris Hanson
>Release:        netbsd-8
Currently the hp300 port's SGC graphics only supports the 9000/425e because it assumes an SGC frame buffer is only in slot 0. On an 9000/425t however, an SGC frame buffer will be in slot 3.

In discussion of this on the port-hp300 list at <>, Izumi Tsutsui suggested that we scan all SGC slots. I've tested the changes to do so on my HP 9000/425t running netbsd-8 and they work fine so I suggest they be incorporated ASAP.
Try to boot netbsd-8 on an HP 9000/425t with SGC graphics (HP A1659A card). You will have to use serial console because the graphical console will stop working partway through the boot.
Incorporate Izumi Tsutsui's fixes posted to the port-hp300 list, rebuild the kernel, and boot the new kernel. NetBSD will come right up.

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