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Michael Brown 4e456d9928 [efi] Do not attempt to drive PCI bridge devices 
The "bridge" driver introduced in 3aa6b79 ("[pci] Add minimal PCI
bridge driver") is required only for BIOS builds using the ENA driver,
where experimentation shows that we cannot rely on the BIOS to fully
assign MMIO addresses.

Since the driver is a valid PCI driver, it will end up binding to all
PCI bridge devices even on a UEFI platform, where the firmware is
likely to have completed MMIO address assignment correctly.  This has
no impact on most systems since there is generally no UEFI driver for
PCI bridges: the enumeration of the whole PCI bus is handled by the
PciBusDxe driver bound to the root bridge.

Experimentation shows that at least one laptop will freeze at the
point that iPXE attempts to bind to the bridge device.  No deeper
investigation has been carried out to find the root cause.

Fix by causing efipci_supported() to return an error unless the
configuration space header type indicates a non-bridge device.

Reported-by: Marcel Petersen <mp@sbe.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2023-02-03 16:10:31 +00:00
.github/workflows [ci] Update to actions/checkout@v3 to silence GitHub warnings 2023-02-03 00:50:16 +00:00
contrib [cloud] Allow aws-import script to run on Python 3.6 2022-04-06 14:36:07 +01:00
src [efi] Do not attempt to drive PCI bridge devices 2023-02-03 16:10:31 +00:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org