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README.md: Add references to Open Security Training

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The old Open Security Training site had a course called Advanced x86:
BIOS and SMM Internals, which had a set of slides outlining the method
to supress SMIs by changing the GBL_SMI_EN bit. Add a reference to it as
this is where I originally learned of this method.
This commit is contained in:
Nicholas Chin
2023-11-12 20:14:08 -07:00
parent 39a3de574a
commit f481908135
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util/dell-flash-unlock/README.md
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@@ -100,3 +100,7 @@ There are other possible protection mechanisms that the firmware can utilize,
such as Protected Range Register settings, which apply access permissions to
address ranges of the flash, similar to the IFD. However, the E6400 vendor
firmware does not utilize these, so they will not be discussed.
## References
- Open Security Training: Advanced x86: BIOS and SMM Internals - SMI Suppression
- https://opensecuritytraining.info/IntroBIOS_files/Day1_XX_Advanced%20x86%20-%20BIOS%20and%20SMM%20Internals%20-%20SMI%20Suppression.pdf