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The SiS 85C496/497 486 Green PC VESA/ISA/PCI Chipset has support for PCI
steering and the ELCR register implemented. These features are handled
by the SiS85C497 AT Bus Controller & Megacell (ATM) ISA bridge, however
the device is wired as a peer bridge directly to the host bus and has
its PCI configuration registers decoded at addresses 0x80-0xff by the
accompanying SiS85C496 PCI & CPU Memory Controller (PCM) host bridge[1].
Therefore we need to match on the host bridge's vendor and device ID.
Like with the SiS85C503 PIRQ router handle link value ranges of 1-4 and
0xc0-0xc3, corresponding respectively to PIRQ line numbers counted from
1 and link register PCI configuration space addresses.
References:
[1] "486 Green PC VESA/ISA/PCI Chipset, SiS 85C496/497", Rev 3.0,
Silicon Integrated Systems Corp., July 1995, Part IV, Section 3.
"PCI Configuration Space Registers (00h ~ FFh)", p. 114
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nikolai Zhubr <zhubr.2@gmail.com>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2203301610490.22465@angie.orcam.me.uk
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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.