On Fri, Mar 17, 2006 at 07:19:08PM +0530, Vadivelan@xxxxxxxxxxxx wrote: > I've another doubt. Is it enough to set only the bits KX,SX and UX of > the status register to work in 64-bit mode? KX, SX and UX will be set by the kernel itself on startup. SX doesn't actually matter because Linux doesn't use the supervisor mode. More for completness sake - there are some slight differences between the various 64-bit processors if attempting to execute 64-bit instructions or addresses on a processor configured to 32-bit mode. > Though I've used the cross compiler mips64_fp_be-gcc from MontaVista, > the generated vmlinux image seems to boot fine even without setting the > above bits. > I don't know if I'm operating in 32-bit or 64-bit mode. > But I've enabled 64-bit support in kernel configuration. Always 64-bit mode on a 64-bit kernels - even for 32-bit software. Always 32-bit mode on 32-bit kernels - even on 64-bit hardware. Ralf
