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In order to pack more data into firmware file, we introduce firmware elements and append BB_MCU firmware first. The first part of new firmware file is still unchanged firmware of WiFi CPU, so the new firmware format can be backward compatible to old format. The new elements part consists of ID and size basically, which can append more elements simply. To avoid unaligned access in certain platform and be easy to read, headers of all elements start at 16-byte aligned address. +===========================================+ | original firmware | | +-------------+ | | padding | +===========================================+ | elm ID 1 | elm size | other header data | +----------+----------+ | | | +-------------------------------------------+ | content (variable length) | | +-------------+ | | padding | +===========================================+ | elm ID 2 | elm size | other header data | +----------+----------+ | | | +-------------------------------------------+ | content (variable length) | | +-----------------------+ | | (no padding for the last one) +===================+ More detail of element header is shown below. The additional fields 'version' and 'element_priv[]' are meta data of elements, so that we can know element version easily, and element_priv[] provide specific fields for certain element, such as RF path index for RF parameter tables. +===========================================+ | elm ID | elm size | version | rsvd0 | +----------+----------+----------+----------+ | rsvd1/2 | element_priv[] | +-------------------------------------------+ Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://lore.kernel.org/r/20230801021127.15919-7-pkshih@realtek.com
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 Restructured Text 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.