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561 shaares
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coreboot
If I erase the entire ME region from 0x3000 to 0x4FFFFF the system will
not boot at all. The indicator on the power button will flash when
I press it, but the system does not seem to respond otherwise (I do not
have a port 80 debugger or hardware serial port to see where it is
failing). Reflashing with the original ME firmware restores it's
not boot at all. The indicator on the power button will flash when
I press it, but the system does not seem to respond otherwise (I do not
have a port 80 debugger or hardware serial port to see where it is
failing). Reflashing with the original ME firmware restores it's
Setting battery threshold on a X230 with coreboot
The tpacpi-bat utility doesn't work after flashing coreboot. An alternative is using the coreboot util ectool. One can set the lower and upper charging threshold by writing the desired battery charge percentage (in hex) to addresses 0xb0 and 0xb1 respectively. So to start charging only when the battery is below 40% (0x28 in hex), one would execute:
# ectool -w 0xb0 -z 0x28
To stop charging an 70% (0x46 in hex):
# ectool -w 0xb1 -z 0x46
Hex values can be determined e.g. using printf:
$ printf '%x\n' 70
46
This can then be run as a script on startup to ensure permanence.
The tpacpi-bat utility doesn't work after flashing coreboot. An alternative is using the coreboot util ectool. One can set the lower and upper charging threshold by writing the desired battery charge percentage (in hex) to addresses 0xb0 and 0xb1 respectively. So to start charging only when the battery is below 40% (0x28 in hex), one would execute:
# ectool -w 0xb0 -z 0x28
To stop charging an 70% (0x46 in hex):
# ectool -w 0xb1 -z 0x46
Hex values can be determined e.g. using printf:
$ printf '%x\n' 70
46
This can then be run as a script on startup to ensure permanence.
