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docs: Add note about checking CSME state

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I had forgotten that CSME reporting an error was normal when disabled.
Document what is should report when enabled/disabled.

Signed-off-by: Tim Crawford <tcrawford@system76.com>
This commit is contained in:
Tim Crawford
2023-09-07 06:58:47 -06:00
committed by Tim Crawford
parent 5844541031
commit 52f6d72713
1 changed files with 28 additions and 0 deletions
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docs/intel-me.md
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@@ -27,6 +27,34 @@ A restart is required for the change to take effect. On the boot after changing
the value, the system will perform a global reset (power off again) to complete
the change and ensure the IME is operating in a valid state.
### Checking the state
coreboot will log some IME data to cbmem during startup. This can be used to
check if it is in the correct state.
```
make -C coreboot/util/cbmem
sudo ./coreboot/util/cbmem/cbmem -c
```
When disabled it will report:
```
ME: Current Working State : 4
ME: Current Operation State : 1
ME: Current Operation Mode : 3
ME: Error Code : 2
```
When enabled it will report:
```
ME: Current Working State : 5
ME: Current Operation State : 1
ME: Current Operation Mode : 0
ME: Error Code : 0
```
## Tiger Lake-U
Models using TGL-U processors default to having the IME enabled. TGL-U removes