mirror of https://github.com/ipxe/ipxe.git
a029f4e13b
The VirtualBox E1kNetDxe driver has a Stop() method that relies on being passed its own child device handle. Unfortunately, the same driver's Start() method never opens the parent device handle with BY_CHILD_CONTROLLER attributes on behalf of the newly installed child device handle, with the result that the UEFI device model is completely unaware of the nominal parent-child relationship. This omission can be observed via the UEFI shell "devtree" command, which will show the child SNP device handle as a standalone top-level device handle, with no relationship to its underlying parent PCI device handle. The upshot of this omission is that the VirtualBox E1kNetDxe driver's Stop() method is a pure no-op. Calling DisconnectController() on the PCI device handle will return successfully, but will not have actually disconnected anything. A subsequent attempt to open the handle on behalf of iPXE's native Intel driver will get stuck in an infinite loop inside OpenProtocol(), as the firmware repeatedly calls DisconnectController() in an attempt to disconnect the E1kNetDxe driver from the PCI device handle. Work around this problem by adding the buggy VirtualBox E1kNetDxe driver to the veto list. Signed-off-by: Michael Brown <mcb30@ipxe.org> |
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README
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org