AM335x change Linux console from UART0 to UART2

CKamas

Hi all,

I am bringing up a custom board. We moved the debug console from UART0 to UART2. I was able to get UBOOT to use UART2, but can not figure out how to setup the Linux Source to use UART2. Any suggestions?

Thank You.

Chuck

over 12 years ago

0 Miroslav Kiradzhiyski XID over 12 years ago

TI__Mastermind 25235 points

Hi Chuck,

The kernel serial console can be changed by the U-Boot "console" env var:

setenv console ttyO2,115200n8

If you wish to change the user-space console as well, you need to change the following line inside /etc/inittab in your rootfs partition:

S:2345:respawn:/sbin/getty 115200 ttyO0

Best regards,
Miroslav

0 CKamas over 12 years ago in reply to Miroslav Kiradzhiyski XID

Intellectual 780 points

Thank you.

I neglected to mention that my Uart2 is on L18 and K18. Which are routed as part of the MII in mode 0 of the ZCZ package. How do I change those pins to be UART2 TX and RX in kernel code?

Thanks,

Chuck

0 argeebee over 12 years ago in reply to CKamas

Intellectual 835 points

Modify pinmux settings in the appropriate platform file in the kernel. One such file is in arch/arm/mach-omap2/board-am335xevm.c. Change the pins and recompile the kernel.

0 Harsha J K over 11 years ago

Expert 1010 points

Hi CKamas,

I am also trying to change linux console from UART0 to UART2 on the Beagle bone black but, the uboot messages does not show up on UART2 whereas the kernel log shows up completely and I am able to get the liunx userspace console as well on UART2.

Any help would be appreciated.

Can you suggest me how you moved the debug console from uart0 to uart2?

0 CKamas over 11 years ago in reply to Harsha J K

Intellectual 780 points

For changing Uboot, as always GOOGLE is your friend:

http://e2e.ti.com/support/arm/sitara_arm/f/791/t/367955.aspx

Good luck and let me know if you get it working.

Chuck

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AM335x change Linux console from UART0 to UART2