nuttx/arch/xtensa/Kconfig

#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#

if ARCH_XTENSA

choice
	prompt "XTENSA architecture selection"
	default ARCH_CHIP_ESP32

config ARCH_CHIP_ESP32
	bool "Expressif ESP32"
	select ARCH_FAMILY_LX6
	select XTENSA_HAVE_INTERRUPTS
	select ARCH_HAVE_MULTICPU
	---help---
		The ESP32 is a dual-core system from Expressif with two Harvard
		architecture Xtensa LX6 CPUs. All embedded memory, external memory
		and peripherals are located on the data bus and/or the instruction
		bus of these CPUs. With some minor exceptions, the address mapping
		of two CPUs is symmetric, meaning they use the same addresses to
		access the same memory.

endchoice # XTENSA chip selection

config ARCH_FAMILY_LX6
	bool
	default n
	---help---
		Cadence® Tensilica® Xtensa® LX6 data plane processing unit (DPU).
		The LX6 is a configurable and extensible processor core.

config ARCH_CHIP
	string
	default "esp32"		if ARCH_CHIP_ESP32

config XTENSA_CP_LAZY
	bool "Lazy co-processor state restoration"
	default n
	depends on EXPERIMENTAL
	---help---
		NuttX logic saves and restores the co-processor enabled (CPENABLE)
		register on each context switch.  This has disadvantages in that (1)
		co-processor context will be saved and restored even if the co-
		processor was never used, and (2) tasks must explicitly enable and
		disable co-processors.

		An alternative, "lazy" co-processor state restore is enabled with 
		this option.  That logic works like as follows:

		a. CPENABLE is set to zero on each context switch, disabling all co-
		   processors.
		b. If/when the task attempts to use the disabled co-processor, an
		   exception occurs
		c. The co-processor exception handler re-enables the co-processor.

config XTENSA_USE_OVLY
	bool
	default n
	---help---
		Enable code overlay support. This option is currently unsupported.

config XTENSA_CP_INITSET
	hex "Default co-processor enables"
	default 0x0001
	range 0 0xffff
	depends on !XTENSA_CP_LAZY
	---help---
		Co-processors may be enabled on a thread by calling xtensa_coproc_enable()
		and disabled by calling xtensa_coproc_disable().  Some co-processors
		should be enabled on all threads by default.  That set of co-processors
		is provided by CONFIG_XTENSA_CP_INITSET.  Each bit corresponds to one
		coprocessor with the same bit layout as for the CPENABLE register.

source arch/xtensa/src/lx6/Kconfig
if ARCH_CHIP_ESP32
source arch/xtensa/src/esp32/Kconfig
endif

endif # ARCH_XTENSA