x64: Troubleshooting a Failed 64-Bit Boot

In some instances, an attempt to boot a 64-bit capable x86 based system to 64-bit mode might fail. This failure might produce an error similar to the following:

Select (b)oot or (i)nterpreter: b kernel/amd64/unix
.
.
.
pci: cannot load driver
Cannot load drivers for /pci@0,0/pci1022,7450@a/pci17c2,10@4/sd@0,0:a
(Can't load the root filesystem)
Press any key to reboot.
.
.
.

In the event such a failure occurs, boot the system to 32-bit mode by typing the following command at the Select (b)oot or (i)nterpreter boot prompt:

Select (b)oot or (i)nterpreter: b kernel/unix

For more information, see Example 16–3.