Memory access controller driver

PCI Memory Controller driver not found. Solved Jump to solution. Labels 1. Labels: Labels: Driver installation. Preview file. In response to Stefan3D. Copy link. All forum topics Previous topic Next topic. Thank you! In response to driversaregone. To activate DMA Verification, use a flag value of 0x80 or add 0x80 to the flag value. For example:. This setting is effective immediately, but is lost when you shut down or reboot the computer. For details, see Using Volatile Settings.

The DMA Verification feature is also included in the standard settings. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? An attacker could connect a special purpose device to a Thunderbolt port and have full direct memory access through the PCI Express bus. This could enable an attacker to gain access to system memory and search for BitLocker encryption keys.

Note that Thunderbolt 3 on the new USB Type-C connector includes new security features which can be configured to protect against this type of access. Some configurations of BitLocker can reduce the risk of this kind of attack.

On the previously mentioned website , refer to the "Prevent installation of drivers matching these device setup classes" section under "Group Policy Settings for Device Installation". On some platforms, completely disabling the device may provide extra security.

On the previously mentioned website , refer to the "Prevent installation of devices that match these device IDs" section under "Group Policy Settings for Device Installation". The following is the Plug and Play compatible ID for a controller:. Beginning with Windows 10 version , newer Intel-based systems include built-in kernel DMA protection for Thunderbolt 3.

No configuration is required for this protection. To block a Thunderbolt controller on a device running an earlier version of Windows, or for platforms that lack kernel DMA protection for Thunderbolt 3 , refer to the "Prevent installation of devices that match these device IDs" section under "Group Policy Settings for Device Installation" on the previously mentioned website.

The drawback of this mitigation is that external storage devices can no longer connect by using the port, and all PCI Express devices that are connected to the Thunderbolt port will not work. If your hardware deviates from current Windows Engineering Guidance, it may enable DMA on these ports after you start the computer and before Windows takes control of the hardware.

This opens your system to compromise, and this condition is not mitigated by this workaround. Protecting BitLocker from Cold Attacks. The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread. Threats include any threat of suicide, violence, or harm to another.

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