non riesco a far partire imac con intel core 2 due a 64 bit

[dingone]

Il titolo dice tutto.
Il metodo usato e' quello di premere contemporaneamente i tasti 6 e 4 al boot.
Dopo il boot is system profiler mi dice che e' ancora a 32 bit.
Un'ultima cosa ho una tastiera tedesca collegata con cavo usb. Devo premere il 6 e 4 sull'estensione?

[Padmé Amidala]

Ti segnalo questo programma, le sue spiegazioni e le FAQ giù in fondo. NB: non hai precisato il modello di Mac!

http://www.ahatfullofsky.comuv.com/English/Programs/SMS/SMS.html

Q: I tried your program and I tried holding the 6 and the 4 key on startup but it still says that the kernel is running in 32-bit mode. How can I start the kernel in 64-bit mode?

A: You can’t. Not unless you hack the EFI which is a bad idea. As explained above Apple currently does not support booting into a 64-bit kernel on a range of Macs - and for very good reasons. Apple might deliver a firmware upgrade when third party apps had enough time to rewrite their kernel extensions as 64-bit kernel extensions. The officially supported Macs are shown in the list above, though there are some more Macs which can boot into the 64-bit kernel and which are not on the list (like the MacBookPro5,5).

Q: My Mac is one of the supported machines but I still can’t start the kernel in 64-bit mode.

A: Even if you computer is fully capable to boot in 64 bit but you have an EFI PASSWORD set, pressing 6 and 4 at the boot will not work

[Lester]

Se ti riferisci a System Profiler > Software > Estensioni e Kernel a 64 bit: No, sul mio MBP7,1 vedo la stessa cosa [però riesco ad avviare a 64 bit, scusa la risposta approssimativa]. Questa discussione Apple affronta il problema e contiene i link agli articoli essenziali del supporto:

http://discussions.apple.com/thread.jspa?threadID=2352868

L'osservazione chiave potrebbe essere questa:


Keep in mind that even Macs that can run in 64 bit mode default to 32 bit mode with Snow Leopard (except the server version). This is in part because if the Mac uses the 64 bit kernel it can't use 32 bit extensions, meaning some devices that require drivers won't work because there are as yet no 64 bit drivers for them.

E nel post successivo:


Possibly having internal components for which there are no 64 bit drivers would explain a lot.

Edit: a conferma (mi pare) di quanto riporta Padmé, verifica nel Terminale la tua versione dell'EFI con il comando:

ioreg -l -p IODeviceTree | grep firmware-abi

http://discussions.info.apple.com/thread.jspa?threadID=2162120

[dingone]

Tra le discussioni segnalatemi c'era questo link:

http://support.apple.com/kb/HT3770

Il mio imac e' un mid 2007 (7.1) qundi non supporta i 64 bit. Grazie per l'aiuto.

Edit: C'era anche la lista di quelli compatibili sul sito del programmino segnalatomi da Padme