> What do you presently do for other 64-bit architectures that support > 32-bit binaries? E.g., UltraSparc, that can run Sparc binaries? AFAIK Debian doesn't currently ship much for ultrasparc. We have 64-bit kernel, but we don't distribute 64-bit userland, only 32-bit userland, and glibc and gcc which are able to produce 64-bit code if necessary. The kernel runs in 64-bit space while userland runs in 32-bit space. regards, junichi