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Starting from the Lunar Lake generation, the ISH firmware has been divided into two components for better space optimization and increased flexibility. These components include a bootloader that is integrated into the BIOS, and a main firmware that is stored within the operating system's file system. Introduce support for loading ISH main firmware from host. This feature is applicable for Lunar Lake and later generation. Current intel-ishtp-loader, is designed for Chrome OS based systems which uses core boot and has different firmware loading method. For non chrome systems the ISH firmware loading uses different method. Key differences include: 1. The new method utilizes ISHTP capability/fixed client to enumerate the firmware loader function. It does not require a connection or flow control, unlike the method used in Chrome OS, which is enumerated as an ISHTP dynamic client driver, necessitating connect/disconnect operations and flow control. 2. The new method employs a table to describe firmware fragments, which are sent to ISH in a single operation. Conversely, the Chrome OS method sends firmware fragments in multiple operations within a loop, sending only one fragment at a time. Additionally, address potential error scenarios to ensure graceful failure handling. - Firmware Not Found: Triggers if request_firmware() fails, leaving ISH in a waiting state. Recovery: Re-insmod the ISH drivers to retry. - DMA Buffer Allocation Failure: Occurs during prepare_dma_bufs(), leading to ISH waiting state. Allocated resources are released. Recovery: Re-insmod the ISH drivers to retry. - Incorrect Firmware Image: Causes ISH to refuse loading after three failed attempts. Recovery: A platform reset is required. Please refer to the [Documentation](Documentation/hid/intel-ish-hid.rst) for the details on flows. Signed-off-by: Zhang Lixu <lixu.zhang@intel.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jiri Kosina <jkosina@suse.com> |
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| Documentation | ||
| drivers | ||
| fs | ||
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| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
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| .editorconfig | ||
| .get_maintainer.ignore | ||
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| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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| README | ||
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.