[OpenWrt-Devel] [PATCH] mxs: disable unused serial drivers

Michael Heimpold mhei at heimpold.de
Sat Mar 9 03:44:35 EST 2019

This disables PL010 and 8250 serial support for this platform
as both drivers are not used: the debug UART is PL011 and the
application UARTs use a dedicated MXS specific driver.

The kernel size reduction is neglectable, but it also removes
the non-working (confusing) /dev/ttyS0 and /dev/ttyS1 devices
in a running system (which generate errors when trying to use):

  root at OpenWrt:~# echo "hello world" > /dev/ttyS0
  ash: write error: I/O error
  root at OpenWrt:~#

Signed-off-by: Michael Heimpold <mhei at heimpold.de>
 target/linux/mxs/config-4.14 | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/target/linux/mxs/config-4.14 b/target/linux/mxs/config-4.14
index 43d6a59bae..abad1807cd 100644
--- a/target/linux/mxs/config-4.14
+++ b/target/linux/mxs/config-4.14
@@ -262,9 +262,7 @@ CONFIG_RTC_MC146818_LIB=y
 # CONFIG_SCHED_INFO is not set
 # CONFIG_SCSI_DMA is not set
+# CONFIG_SERIAL_8250 is not set

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