Change u-boot console uart on T20

Technical Support
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1

I am looking to try Linux on my Colibri T20.
I have installed the image and all is working fine, but to run this on my custom carrier board, i need to change a few things.
The main one is the u-boot console port.
A device connected to the current UART responds causing the autoboot to stop.
So how do i change the Console port?

2

Hello @ObiTwo and welcome to the Toradex Community!

Please have a look here.

Best regards,
Jaski

3

I have followed the instructions to “Disable U-Boot Console Output on UART_A”
But sadly i cannot stop the console output.
Steps so far.
downloaded 2016.11-toradex image
installed linaro 6.22 gcc

Edited tdx-common.h to include
CONFIG_SILENT_CONSOLE
CONFIG_SYS_DEVICE_NULLDEV
CONFIG_SILENT_CONSOLE_UPDATE_ON_RELOC

Compiled successfully

copied new u-boot-dtb-tegra.bin to image folder as …custom.bin (and created links)

prepped new SD card
and installed uboot image to to my t20 (run update_uboot)

After a reset, i appear to have achieved nothing :frowning:
uboot is still outputting to UARTA
and I can still stop the boot by pressing any key.

Not sure where to start with this.
I have repeated all the steps online several times to make sure, but i’m clearly doing something wrong.

Any suggestions would be greatly appreciated.

4

Perfect. That did the job.
I’m assuming you did mean colibri_t20.h as I am working with the T20.
Thanks.

5

Perfect that it works. Thanks for the feedback.
Sorry for the typo.

6

Hi,

You need to add the mentioned defines in the file include/configs/colibri_t30.h and append silent to the #define BOARD_EXTRA_ENV_SETTINGS as described below:

diff --git a/include/configs/colibri_t30.h b/include/configs/colibri_t30.h
index 124dbdf..26ae437 100644
--- a/include/configs/colibri_t30.h
+++ b/include/configs/colibri_t30.h
@@ -132,9 +132,13 @@
                "${soc}-colibri-${fdt_board}.dtb " \
                "&& setenv dtbparam ${fdt_addr_r}\0"
 
+#define CONFIG_SILENT_CONSOLE
+#define CONFIG_SYS_DEVICE_NULLDEV
+#define CONFIG_SILENT_CONSOLE_UPDATE_ON_RELOC
 #define BOARD_EXTRA_ENV_SETTINGS \
        "boot_file=zImage\0" \
        "console=ttyS0\0" \
+       'silent=1'\
        "defargs=core_edp_mv=1300 usb_high_speed=1 user_debug=30\0" \
        "dfu_alt_info=" DFU_ALT_EMMC_INFO "\0" \
        EMMC_BOOTCMD \