Hello, sgc.

You should also enable the uart2 in DTS:

arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts

There is a code like:

&uart5 {
status = "okay";
};

Change it to uart2 as well.

About the u-boot changes, it might be better to set:

#define CONFIG_CONS_INDEX 2

and define CONFIG_SYS_NS16550_COM2 value instead.

Which u-boot branch do you use? I've checked with v2016.05, there is only include/configs/ast-g5.h and no ast-common.h at all.

On Mon, 21 Sep 2020 at 01:27, 冉雪 <869883681@qq.com> wrote:

Hello there
I am trying to use openbmc recently. The board uses uart2 as the output of BMC. How can I change the default uart from uart5 to uart2?
The image I compiled on the basis of romulus, first I modified aspeed-bmc-opp-romulus.dts, I opened the uart2 serial port in dts, and modified stdout-path=&uart2,bootargs = "console = ttyS1" in chosen.
Then, I modified the include/config/ast-common.h file in uboot , #define CONFIG_SYS_NS16550_COM1 AST_UART2_BASE(whice is AST_UART0_BASE).
Am I doing something wrong? Do you have any suggestion?
Thanks!!
sgc.