The following error message appears on bootup of the Sun Fire system controller before it reaches the platform shell.

Oct 01 06:38:14 noname Chassis-Port.SC: WARNING: hostid information is missing

These messages are caused by a downrev ID board. In the early days, only the MAC addresses were programmed in the ID board. ScApp used to manufacture hostids based on the lower 24 bits of each MAC address. This scheme was fundamentally flawed (software is not allowed to assume any relationship between MAC address and hostid) and the error was discovered when we ran out of 8:0:20:x:x:x addresses and switched to the new 0:3:ba:x:x:x block.

All new (starting with P1.3) ID boards are programmed with both MAC addresses and hostids. The message is a warning from ScApp that only the MAC address was found; ScApp is manufacturing the hostids rather than reading them from the ID board. You can safely ignore this warning.