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authorGravatar Rodrigo Vivi <rodrigo.vivi@intel.com> 2019-07-29 08:51:48 -0700
committerGravatar Rodrigo Vivi <rodrigo.vivi@intel.com> 2019-07-29 08:51:48 -0700
commited32f8d42cee118b075e4372a55c7739a11094b2 (patch)
tree5a806c5168d4177e0536b98b6bda30ec4bdbac43 /Documentation/xtensa/booting.txt
parentdrm/i915: Flush the i915_vm_release before ggtt shutdown (diff)
parentLinus 5.3-rc1 (diff)
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Merge drm/drm-next into drm-intel-next-queued
Catching up with 5.3-rc* Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'Documentation/xtensa/booting.txt')
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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.