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The current early PM setup that attempts to configure dynamic clock gating relies on PCIe functions to be enabled that may not be. Instead of reading port 0 or 4 directly to determine the link width use the register that refelects the soft strapping options as this will always be available. Also add a clear register assignment and break for port 0 in the switch statement instead of falling through to port 4 as that could end up setting the slot power limit based on port 4 values instead of based on port 0. register 0xE1=0x3f and all other root ports should have 0xE1=0x03. When port 0 and 4 are disabled they will have 0xE1=0x3C before being disabled by the pch enable handler. LUMPY default: 00:1c.0 PCI bridge: Intel Corporation Device 1c10 (rev b5) 00:1c.3 PCI bridge: Intel Corporation Device 1c16 (rev b5) pci_read8 0 0x1c 0 0xe1 0x3f pci_read8 0 0x1c 3 0xe1 0x03 LUMPY with PCIe port coalesce enabled: 00:1c.0 PCI bridge: Intel Corporation Device 1c10 (rev b5) 00:1c.1 PCI bridge: Intel Corporation Device 1c16 (rev b5) pci_read8 0 0x1c 0 0xe1 0x3f pci_read8 0 0x1c 1 0xe1 0x03 Change-Id: I33a37b0ec0c8e570cf5d9dda2c06e0225fee135c Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/980 Tested-by: build bot (Jenkins)
------------------------------------------------------------------------------- coreboot README ------------------------------------------------------------------------------- coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload. With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required. coreboot was formerly known as LinuxBIOS. Payloads -------- After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot. See http://www.coreboot.org/Payloads for a list of supported payloads. Supported Hardware ------------------ coreboot supports a wide range of chipsets, devices, and mainboards. For details please consult: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://www.coreboot.org/Build_HOWTO for details. Testing coreboot Without Modifying Your Hardware ------------------------------------------------ If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU. Please see http://www.coreboot.org/QEMU for details. Website and Mailing List ------------------------ Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://www.coreboot.org/Mailinglist Copyright and License --------------------- The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details. coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details. This makes the resulting coreboot images licensed under the GPL, version 2.