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There is nothing in the current versions of the UEFI specification that limits the TPL at which we may call ConnectController() or DisconnectController(). However, at least some platforms (observed with a Lenovo ThinkPad T14s Gen 5) will occasionally and unpredictably lock up before returning from ConnectController() if called at a TPL higher than TPL_APPLICATION. Work around whatever defect is present on these systems by dropping to the current external TPL for all calls to ConnectController() or DisconnectController(). Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org