Linux/PROCESSOR-SDK-AM335X: Stopping debug messages on UART0

Hello Nick,

Since you do not want to change the debug UART to another port, but only want to disable debug messages on that port.

Remove the:

U-Boot SPL 2017.01-gc68ed086bd (Mar 26 2018 - 15:08:11)

message by commenting:
<Processor SDK>/board-support/u-boot-<version>/common/spl/spl.c

puts("\nU-Boot SPL " PLAIN_VERSION " (" U_BOOT_DATE " - " \
U_BOOT_TIME ")\n");

to remove:
Trying to boot from MMC1

comment out:
#if defined(CONFIG_SPL_SERIAL_SUPPORT) && defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
if (loader)
/*printf("Trying to boot from %s\n", loader->name);*/
else
puts("SPL: Unsupported Boot Device!\n");

#endif

to remove:
reading uboot.env
reading uboot.env

comment out:
<Processor SDK>/board-support/u-boot-<version>/fs/fat/fat.c

printf("reading %s\n", filename);

to remove:
U-Boot 2017.01-gc68ed086bd (Mar 26 2018 - 15:08:11 -0400)

comment out:
<Processor SDK>/board-support/u-boot-<version>/lib/display_options.c

printf ("\n\n%s\n\n", version_string);

to remove:
CPU

<Processor SDK>/board-support/u-boot-<version>/arch/arm/mach-omap2/am33xx/sys_info.c

printf("CPU : %s-%s rev %s\n", cpu_s, sec_s, rev_s);


to remove:
Model: TI AM335x EVM

comment out:
<Processor SDK>/board-support/u-boot-<version>/common/board_info.c

printf("Model: %s\n", model);

to remove:
DRAM:

comment out:
<Processor SDK>/board-support/u-boot-<version>/common/board_f.c

puts("DRAM: ");

.....................................

print_size(size, "");
board_add_ram_info(0);
putc('\n');

to remove:
NAND:

comment out:
<Processor SDK>/board-support/u-boot-<version>/common/board_r.c

puts("NAND: ");

<Processor SDK>/board-support/u-boot-<version>/drivers/mtd/nand/nand.c

printf("%lu MiB\n", total_nand_size / 1024);

to remove:
MMC:

comment out:
<Processor SDK>/board-support/u-boot-<version>/common/board_r.c

puts("MMC: ");

comment out:
<Processor SDK>/board-support/u-boot-<version>/drivers/mmc/mmc.c

print_mmc_devices(',');

To remove the U-Boot general debug messages:

$ cd <Processor SDK>/
$ make u-boot
$ cd board-support/u-boot-<version>/
$ ARCH=arm make menuconfig
Enable
Console ---> [*] Support a silent console
                        [*] Only silence the U-Boot console

Exit
Do you wish to save your new configuration?
Yes
$ cp .config configs/am335x_evm_defconfig
or
$ cp .config configs/am335x_boneblack_defconfig
depending which config file you set in your <Processor SDK>/Rules.make file.
$ cd ../../
$ make u-boot_clean
$ make u-boot

Copy the new MLO and u-boot.img to your board.
Power it on. Stop the booting in U-Boot console and enter these commands:
=> setenv console /dev/null
=> setenv init_console 'if test $board_name = A335_ICE; then setenv console ttyO3,115200n8;else setenv console /dev/null;fi;'
=> setenv silent 1
=> saveenv
=> reset

Remove the login prompt and arago project message:

am335x-evm login: root
root@am335x-evm:~# rm -rf /etc/issue
root@am335x-evm:~# systemctl disable serial-getty@ttyS0.service
root@am335x-evm:~# systemctl mask serial-getty@ttyS0.service
root@am335x-evm:~# systemctl daemon-reload
root@am335x-evm:~# reboot

Now your UART0 console is free form debug messages.


Best regards,
Kemal

Have you entered the => setenv silent 1 after enabling this option. The connected RS232 can stop the booting and enter in U-Boot console while loading. To avoid this set "the delay in seconds before automatically booting" option in menuconfig to -2.