None

Endianness selection

Some SuperH machines can be configured for either little or big
endian byte order. These modes require different kernels.

SH_FPU

FPU support

Selecting this option will enable support for SH processors that
have FPU units (ie, SH77xx).

This option must be set in order to enable the FPU.

SH_FPU_EMU

FPU emulation support

Selecting this option will enable support for software FPU emulation.
Most SH-3 users will want to say Y here, whereas most SH-4 users will
want to say N.

SH_DSP

DSP support

Selecting this option will enable support for SH processors that
have DSP units (ie, SH2-DSP, SH3-DSP, and SH4AL-DSP).

This option must be set in order to enable the DSP.

SH_ADC

ADC support

Selecting this option will allow the Linux kernel to use SH3 on-chip
ADC module.

If unsure, say N.

SH_STORE_QUEUES

Support for Store Queues

Selecting this option will enable an in-kernel API for manipulating
the store queues integrated in the SH-4 processors.

SPECULATIVE_EXECUTION

Speculative subroutine return

This enables support for a speculative instruction fetch for
subroutine return. There are various pitfalls associated with
this, as outlined in the SH7780 hardware manual.

If unsure, say N.

CPU_HAS_SR_RB

This will enable the use of SR.RB register bank usage. Processors
that are lacking this bit must have another method in place for
accomplishing what is taken care of by the banked registers.

See <file:Documentation/sh/register-banks.rst> for further
information on SR.RB and register banking in the kernel in general.