soc/intel/adl: Prevent unconditional legacy COM ports initialization

This patch eliminates the LPC_IOE_COMA_EN and LPC_IOE_COMB_EN IO enables
from the io_enables variable in the pch_early_iorange_init() function
because lpc_io_setup_comm_a_b() is intended to activate legacy COM
ports like COM-A (0x3F8 - 0x3FF) and COM_B (0x2F8 - 0x2FF).

These COM ports are being activated unconditionally, which is
undesirable for the Intel Alder Lake platform and causes traffic over
the IO bus.

As a result, this code is being removed and platforms that select
DRIVERS_UART_8250IO can activate legacy COM ports.

BUG=b:354066052
TEST=Able to boot google/redrix to the operating system and confirm
that there was no traffic over legacy COMs while being monitored
using the eSPI analyzer.

Change-Id: I7a6e38bd151f823d37c07ee89a800489122cc209
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84080
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Dinesh Gehlot <digehlot@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions