2.5.5pre1 changes.....

Well,

I was trying to get 2.5.5pre1 to boot on my Ultra5...

  No such luck, anyone have luck with this one?  

I see that they have changed switch_to() in scheduler from three arguments
to two.  I don't see the relevant changes to the asm-sparc64 include files.
That's a bit beyond my talent to look at.  Anyone checking these changes
out?  Not sure how to proceed with making changes to these files...

Thanks,
Bruce H.