G_SYS_PART
part = G_SYS_PART(READ_REG(MIPS_PHYS_TO_KSEG1(A_SCD_SYSTEM_REVISION)));
u_int sys_part = G_SYS_PART(READ_REG(MIPS_PHYS_TO_KSEG1(A_SCD_SYSTEM_REVISION)));
part = G_SYS_PART(READ_REG(MIPS_PHYS_TO_KSEG1(A_SCD_SYSTEM_REVISION)));
u_int sys_part = G_SYS_PART(READ_REG(MIPS_PHYS_TO_KSEG1(A_SCD_SYSTEM_REVISION)));