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The UART settings are embedded in the config blob. This has to be parsed to successfully initialize the Bluetooth part of the RTL8723BS (which is an SDIO chip, but the Bluetooth part is connected via UART). The Realtek "rtl8723bs_bt" and "rtl8723ds_bt" userspace Bluetooth UART initialization tools (rtk_hciattach) use the following sequence: - send H5 sync pattern (already supported by hci_h5) - get LMP version (already supported by btrtl) - get ROM version (already supported by btrtl) - load the firmware and config for the current chipset (already supported by btrtl) - read UART settings from the config blob (part of this patch) - send UART settings via a vendor command to the device (which changes the baudrate of the device and enables or disables flow control depending on the config) - change the baudrate and flow control settings on the host - send the firmware and config blob to the device (already supported by btrtl) Sending the last firmware and config blob download command (rtl_download_cmd) fails if the UART settings are not updated beforehand. This is presumably because the device applies the config right after the firmware and config blob download - which means that at this point the host is using different UART settings than the device (which will obviously result in non-working communication). Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Jeremy Cline <jeremy@jcline.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.