Which hardware/software is capable of 64-bit? Which is only 64-bit? How can I tell which is running?


Only UltraSPARC hardware (and Fujitsu SPARC64) can run in 64-bit mode. All
UltraSPARC hardware is capable of it, but UltraSPARC-I (up to 200MHz)
suffers from a bug where, in 64-bit mode, a certain code sequence can cause
the processor to stall, and thus UltraSPARC-I machines run in 32-bit mode
by default. To allow a 64-bit kernel on such a machine, edit/create
/platform//boot.conf and add the line:
ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU=true

Solaris 2.6 and earlier are 32-bit only. Solaris 7 and later support
both 32-bit and 64-bit modes.

Only some UltraSPARC-I, UltraSPARC-II, and UltraSPARC-IIi (e.g. Ultra 5/10)
systems support both 64-bit and 32-bit operation. UltraSPARC-IIe (e.g.
Sunblade 100) and ULtraSPARC-III (e.g. Sunblade 1000) are 64-bit mode
only.

"isainfo -kv" or "isainfo -b" will indicate whether a system is running in
32-bit or 64-bit mode.


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