It seems to me that with the current state of ioctl translation, having a 32 bit userland is a PITA for a 64 bit kernel. I'm not certain that a 32 bit kernel would work on a sun4u and hence I have always built my own 64 bit kernel RPMs. What gets me the latest is XFS - seems that none of those ioctl would work with a 64 bit kernel and I have heard reports about 64 bit userland still not working properly. Searching on compat_ioctl doesn't get me anywhere (as it seems XFS switched to using compat_ioctl) and I get a lot of "ioctl32 Unknown cmd" with the XFS tools. I know that staying with Linux on sun4u platform is an up-hill battle but Sun hardware do have its advantages.
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