[PATCH] imx: kontron-sl-mx6ul: Enable CONFIG_DM_MDIO to fix boot abort

[Frieder Schrempf]

From: Frieder Schrempf <frieder.schrempf at kontron.de>

The following failure occurs right before switching to the kernel:

data abort
pc : [<9ff60162>]	   lr : [<9ff79d13>]
reloc pc : [<8781c162>]	   lr : [<87835d13>]
sp : 9bf30f78  ip : 9bf4b140	 fp : 007963a0
r10: fffffdfb  r9 : 9bf3bed0	 r8 : 00004600
r7 : 00000000  r6 : 9ffe5a0c	 r5 : 00004600  r4 : 9bf4acf0
r3 : f5f5f5f5  r2 : f5f5f5f5	 r1 : 9ffe0c5c  r0 : 9bf7c130
Flags: NzCv  IRQs off  FIQs off  Mode SVC_32 (T)
Code: 9ffe b158 e9d0 2300 (6053) 601a
Resetting CPU ...

This is due to the fact that the board uses a shared MDIO bus for
both ethernet controllers, but FEC_MXC_SHARE_MDIO is not enabled.

This results in a double free in fecmxc_remove(). To fix this
enable CONFIG_DM_MDIO so the shared MDIO is correctly detected
from the devicetree.

Fixes: 048fdda977ab ("imx: kontron-sl-mx6ul: Enable second ethernet interface")
Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
---
 configs/kontron-sl-mx6ul_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/kontron-sl-mx6ul_defconfig b/configs/kontron-sl-mx6ul_defconfig
index c6d450419cc..4203c3e8a4b 100644
--- a/configs/kontron-sl-mx6ul_defconfig
+++ b/configs/kontron-sl-mx6ul_defconfig
@@ -96,6 +96,7 @@ CONFIG_SPI_FLASH_MTD=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_MICREL=y
 CONFIG_PHY_MICREL_KSZ8XXX=y
+CONFIG_DM_MDIO=y
 CONFIG_DM_ETH_PHY=y
 CONFIG_FEC_MXC=y
 CONFIG_MII=y
-- 
2.54.0