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| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2019-11-17 18:34:01 +0100 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2019-11-17 18:34:01 +0100 |
| commit | 8389a7b909f252e74ea92b2794de8d660cfee96e (patch) | |
| tree | a947f3080e953e4a44417389b3f2b69d4817be2e /Documentation/arm64/memory.rst | |
| parent | ad39b5a1ed68032292794b41a5f9e41ea69f8052 (diff) | |
| parent | 83cba933a6db1dd4d7ac85170f99461fbc339eff (diff) | |
| download | blackbird-op-linux-8389a7b909f252e74ea92b2794de8d660cfee96e.tar.gz blackbird-op-linux-8389a7b909f252e74ea92b2794de8d660cfee96e.zip | |
Merge tag 'spi-nor/for-5.5' into mtd/next
SPI NOR core changes:
- introduce 'struct spi_nor_controller_ops',
- clean the Register Operations methods,
- use dev_dbg insted of dev_err for low level info,
- fix retlen handling in sst_write(),
- fix silent truncations in spi_nor_read and spi_nor_read_raw(),
- fix the clearing of QE bit on lock()/unlock(),
- rework the disabling of the block write protection,
- rework the Quad Enable methods,
- make sure nor->spimem and nor->controller_ops are mutually exclusive,
- set default Quad Enable method for ISSI flashes,
- add support for few flashes.
SPI NOR controller drivers changes:
- intel-spi:
- support chips without software sequencer,
- add support for Intel Cannon Lake and Intel Comet Lake-H flashes.
Diffstat (limited to 'Documentation/arm64/memory.rst')
| -rw-r--r-- | Documentation/arm64/memory.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/arm64/memory.rst b/Documentation/arm64/memory.rst index b040909e45f8..02e02175e6f5 100644 --- a/Documentation/arm64/memory.rst +++ b/Documentation/arm64/memory.rst @@ -154,11 +154,18 @@ return virtual addresses to userspace from a 48-bit range. Software can "opt-in" to receiving VAs from a 52-bit space by specifying an mmap hint parameter that is larger than 48-bit. + For example: - maybe_high_address = mmap(~0UL, size, prot, flags,...); + +.. code-block:: c + + maybe_high_address = mmap(~0UL, size, prot, flags,...); It is also possible to build a debug kernel that returns addresses from a 52-bit space by enabling the following kernel config options: + +.. code-block:: sh + CONFIG_EXPERT=y && CONFIG_ARM64_FORCE_52BIT=y Note that this option is only intended for debugging applications |

