3758a19111
Previously, pci_register_legacy_regions() reserved PCI address space under every PCI host bridge for the System ROM and the Video ROM, but these regions are not part of PCI address space. Previously, pci_register_legacy_regions() reserved the following areas of PCI address space under every PCI host bridge: [bus 0xa0000-0xbffff] Video RAM area (VGA frame buffer) [bus 0xc0000-0xc7fff] Video ROM [bus 0xf0000-0xfffff] System ROM It does need to reserve the [bus 0xa0000-0xbffff] region (at least if there's a possibility of a VGA device below the bridge) because VGA devices can respond to that even if they don't describe it with a BAR. But the Video ROM and System ROM areas don't seem necessary because they are not areas that legacy PCI devices respond to. They appear to be copied from x86, where they describe areas of system memory that depend on BIOS conventions. On x86, BIOS copies the option ROM of the primary VGA device to RAM at 0xc0000, and the 0xf0000-0xfffff region is reserved for the motherboard BIOS. Neither of these things applies to sparc. Stop reserving the System ROM and Video ROM regions in PCI space. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: David S. Miller <davem@davemloft.net> |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.