docs: move xtensa documentation under Documentation/arch/

[thirdparty/linux.git] / Documentation / xtensa / booting.rst

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-=====================================
-Passing boot parameters to the kernel
-=====================================
-
-Boot parameters are represented as a TLV list in the memory. Please see
-arch/xtensa/include/asm/bootparam.h for definition of the bp_tag structure and
-tag value constants. First entry in the list must have type BP_TAG_FIRST, last
-entry must have type BP_TAG_LAST. The address of the first list entry is
-passed to the kernel in the register a2. The address type depends on MMU type:
-
-- For configurations without MMU, with region protection or with MPU the
-  address must be the physical address.
-- For configurations with region translarion MMU or with MMUv3 and CONFIG_MMU=n
-  the address must be a valid address in the current mapping. The kernel will
-  not change the mapping on its own.
-- For configurations with MMUv2 the address must be a virtual address in the
-  default virtual mapping (0xd0000000..0xffffffff).
-- For configurations with MMUv3 and CONFIG_MMU=y the address may be either a
-  virtual or physical address. In either case it must be within the default
-  virtual mapping. It is considered physical if it is within the range of
-  physical addresses covered by the default KSEG mapping (XCHAL_KSEG_PADDR..
-  XCHAL_KSEG_PADDR + XCHAL_KSEG_SIZE), otherwise it is considered virtual.