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Thomas Zimmermann bb610b6fc1 firmware: google: framebuffer: Do not mark framebuffer as busy 
commit f3850d399d upstream.

Remove the flag IORESOURCE_BUSY flag from coreboot's framebuffer
resource. It prevents simpledrm from successfully requesting the
range for its own use; resulting in errors such as

[    2.775430] simple-framebuffer simple-framebuffer.0: [drm] could not acquire memory region [mem 0x80000000-0x80407fff flags 0x80000200]

As with other uses of simple-framebuffer, the simple-framebuffer
device should only declare it's I/O resources, but not actively use
them.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 851b4c1453 ("firmware: coreboot: Add coreboot framebuffer driver")
Acked-by: Tzung-Bi Shih <tzungbi@kernel.org>
Acked-by: Julius Werner <jwerner@chromium.org>
Cc: Samuel Holland <samuel@sholland.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Tzung-Bi Shih <tzungbi@kernel.org>
Cc: Brian Norris <briannorris@chromium.org>
Cc: Julius Werner <jwerner@chromium.org>
Cc: chrome-platform@lists.linux.dev
Cc: <stable@vger.kernel.org> # v4.18+
Link: https://patch.msgid.link/20260217155836.96267-3-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-06-01 17:35:13 +02:00
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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.