There was a very interessting discussion at a Sun internel VMware mailing list.
The subject was the installation of Solaris 10 Update 4 on a VMware ESX Server with Intel Xeon 5400 CPU´s.

Background! You must install a patch 127112-07 on Solaris 10 Update 4 to run Solaris on the Xeon 5400 CPU.

But how do I install this patch in a Solaris which crash at the start up? David wirte a small step by step for this.

Solaris installation:

• Install as 32 bit Solaris
• Boot failsafe, answer 'y' to mount /a
• edit /a/boot/grub/menu.lst to force booting in 32-bit mode:
• change multiboot line to ...multiboot kernel/unix
• reboot
• Install rest of CD's
• Logon as root
• Install patch 118855-19
• cd /net/patchdb.central/patches/patchroot/all_unsigned
• ls -l 118855*
• cp 118855-19.zip /tmp
• cd /tmp
• unzip 118855-19.zip
• patchadd -M . 118855-19
• reboot and test if Solaris works in 32 bit mode
• edit /boot/grub/menu.lst to force booting in 32-bit mode:
• change multiboot kernel/unix line to ...multiboot
• reboot
  

Test the system

Thanks guys!