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mb/siemens/mc_ehl7: Deactivate RTC

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On this mainboard no RTC is assembled. Therefore, it is deactivated.

TEST=Boot into OS and verify if relevant I2C Controller is disabled and
no error in coreboot log is shown.

Change-Id: I23b4a735a09686fa2636280d7b410db59d884c49
Signed-off-by: Uwe Poeche <uwe.poeche@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90715
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
This commit is contained in:
Uwe Poeche 2026-01-09 12:27:16 +01:00 • committed by Matt DeVillier
commit ddf4748c22
2 changed files with 1 additions and 23 deletions
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1
src/mainboard/siemens/mc_ehl/variants/mc_ehl7/Kconfig
View file

@ -6,7 +6,6 @@ config BOARD_SPECIFIC_OPTIONS
def_bool y
select DRIVER_INTEL_I210
select DRIVERS_ETH_PHY_M88E1512
select DRIVERS_I2C_RV3028C7
select EHL_TSN_DRIVER
select MAINBOARD_HAS_TPM2
select MEMORY_MAPPED_TPM

23
src/mainboard/siemens/mc_ehl/variants/mc_ehl7/devicetree.cb
View file

@ -95,7 +95,7 @@ chip soc/intel/elkhartlake
# LPSS Serial IO (I2C/UART/GSPI) related UPDs
register "SerialIoI2cMode" = "{
[PchSerialIoIndexI2C0] = PchSerialIoDisabled,
[PchSerialIoIndexI2C1] = PchSerialIoPci,
[PchSerialIoIndexI2C1] = PchSerialIoDisabled,
[PchSerialIoIndexI2C2] = PchSerialIoPci,
[PchSerialIoIndexI2C3] = PchSerialIoDisabled,
[PchSerialIoIndexI2C4] = PchSerialIoPci,
@ -105,7 +105,6 @@ chip soc/intel/elkhartlake
}"
register "SerialIoI2cPadsTermination" = "{
[PchSerialIoIndexI2C1] = 1,
[PchSerialIoIndexI2C2] = 1,
[PchSerialIoIndexI2C4] = 1,
[PchSerialIoIndexI2C6] = 1,
@ -155,26 +154,6 @@ chip soc/intel/elkhartlake
device pci 14.0 on end # USB3.1 xHCI
device pci 15.1 on # I2C1
# Enable external RTC chip
chip drivers/i2c/rv3028c7
register "bus_speed" = "I2C_SPEED_STANDARD"
register "set_user_date" = "1"
register "user_year" = "04"
register "user_month" = "07"
register "user_day" = "01"
register "user_weekday" = "4"
register "bckup_sw_mode" = "BACKUP_SW_LEVEL"
register "cap_charge" = "CHARGE_OFF"
device i2c 0x52 on end # RTC RV3028-C7
end
# Add dummy I2C device to limit BUS speed to 100 kHz in OS
chip drivers/i2c/generic
register "hid" = ""PRP0001""
register "speed" = "I2C_SPEED_STANDARD"
device i2c 0x7f on end
end
end
device pci 15.2 on # I2C2
# Add dummy I2C device to limit BUS speed to 100 kHz in OS
chip drivers/i2c/generic