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SPI NOR introduces byte swap support for 8D-8D-8D mode and a user for it: macronix. SPI NOR flashes may swap the bytes on a 16-bit boundary when configured in Octal DTR mode. For such cases the byte order is propagated through SPI MEM to the SPI controllers so that the controllers swap the bytes back at runtime. This avoids breaking the boot sequence because of the endianness problems that appear when the bootloaders use 1-1-1 and the kernel uses 8D-8D-8D with byte swap support. Along with the SPI MEM byte swap support we queue a patch for the SPI MXIC controller that swaps the bytes back at runtime. # -----BEGIN PGP SIGNATURE----- # # iQEzBAABCgAdFiEEHUIqys8OyG1eHf7fS1VPR6WNFOkFAmczG/oACgkQS1VPR6WN # FOnTCAf/YjH9AimQAFJLRKoGqsf6boh1JppcRh1YTRS+D6+Ap9+s1gJoZZYs5VWA # vNfBzGqDXknBvpmOgoXnuDu2zFs9FUvdN5Kf7w6LiS5qtz7uOxHdVoDQyDgnN6w5 # 9ts7qF7LViBHg/HgTEzQT2Zj6qmvIwUbccIkmJeehWjEP/urzOML5nPnM9g4HZVB # W8B5KQ4TiOY1GxkXvIP6EQS6mDKznP3yl2Hnsmk0HPpSm6D807O2zvT+z1SCxpjy # C8+mYRKsRxHoFGL6UzWgqREGBn2wzF7Ral1CR9SpSZZLLtr6S0shqRzKiiH8eiZK # 1hFpXzMS3OWi4a/5724AWaqcR0Qgqw== # =jf3Q # -----END PGP SIGNATURE----- # gpg: Signature made Tue 12 Nov 2024 10:12:26 AM CET # gpg: using RSA key 1D422ACACF0EC86D5E1DFEDF4B554F47A58D14E9 # gpg: Good signature from "Tudor Ambarus (4096-bit rsa key) <tudor.ambarus@microchip.com>" [full] # gpg: aka "Tudor Ambarus <tudor.ambarus@gmail.com>" [full] # gpg: tudor.ambarus@microchip.com: Verified 15 signatures in the past 5 years. # Encrypted 0 messages. # gpg: tudor.ambarus@gmail.com: Verified 15 signatures in the past 5 years. # Encrypted 0 messages.
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.