1. Running Solaris in 32 or 64 Bit mode

Finding the running mode
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#isainfo -v
64-bit sparcv9 applications
32-bit sparc applications

Booting in 32 bit
mode
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ok> boot kernel/unix
# eeprom boot-file=kernel/unix

Booting in 64 bit mode
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OK>boot kernel/sparcv9/unix

# eeprom boot-file=kernel/sparcv9/unix

…reboot the system

Edit /platform/platform-name/boot.conf uncomment line with the variable named ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU set to the value true .

ALLOW_64BIT_KERNEL_ON_UltraSPARC_1_CPU=true

… reboot the system .

If diag switch is set to true following needs to be set
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for 32 bit
# /usr/sbin/eeprom diag-file=”kernel/unix”

for 64 bit
# /usr/sbin/eeprom diag-file=”kernel/sparcv9/unix”