amd64/82176: ehci causes crash on amd64

[morgothdbma]

>Number:         82176
>Category:       amd64
>Synopsis:       ehci causes crash on amd64
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jun 12 22:00:36 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     morgothdbma
>Release:        5.4
>Organization:
>Environment:
FreeBSD 5.4 Starlight amd64
>Description:
      When using ehci driver for my external HDD (Seagate 160 Gb) with USB2.0 transfers (>20mb/s) causes system to hang. For example: mplayer some-film-on-usb.mpeg, and cp /usb/many/files /home/morgoth/bla
>How-To-Repeat:
      heavy load on amd64 using USB2.0 transfers from external disk
>Fix:
      use ohci instead (but 1.00 mb/s transfers :-(( )
>Release-Note:
>Audit-Trail:
>Unformatted: