install/51948: Troubles with 7.1 RC1 on Sun Blade 2500

[kalta59%gmail.com@localhost]

>Number:         51948
>Category:       install
>Synopsis:       Troubles with 7.1 RC1 on Sun Blade 2500
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 05 16:35:00 +0000 2017
>Originator:     Maurizio Caltabiano
>Release:        7.1 RC1
>Organization:
Maurizio Caltabiano
>Environment:
sun4u
>Description:
Sorry in my delay on testing 7.1 RC1. My configuration is the following: Blade 2500 Red - 2xCPU-8Gb Ram-Original 36Gb Fujitsu 10K-Original DVD-ROM device:
Boot now is going on till the following message:

wskbd1 at ukbd0: console keyboard, using wsdisplay0
root on cd0a dumps on cd0b
root file system type: cd9660
warning: no /dev/console
aceride0:1:0: lost interrupt 
        type: atapi tc_bcount:8192 tc_skip: 0
aceride0:1:0: bus-masterDMA error: missing interrupt,status=0x21
aceride0:1:0: device timeout, c_bcount=8192, c_skip=0
cd0: transfer error, downgrading to Ultra-DMA mode 1

Then the system is freezed and doesn't accept STOP-A
>How-To-Repeat:
Install on same hardware/configuration
>Fix: