disable UART0 on OPI-Zero

[Hikmet TEKIN]

Hi everybody,

 

I have orange pi zero h2+ 512mb ram and I need to use 3 uart to run my c code. 

I can use UART1 on pin 8-10 and UART2 on pin 11-13. I also want to use UART0 in my program but it is attached to console. 

 

How can I disable the UART0 console to use it as normal TTL serial?

 

Thanks

[Hikmet TEKIN]

 

 

I tried to disable from boot/boot.cmd file in orange pi zero 

 

if test "${console}"= "serial" || test "${console}" ="both"; then setenv consoleargs "${consoleargs} console=ttyS0,115200"; fi

I changed this line to this;

if test "${console}"= "serial" || test "${console}" ="both"; then setenv consoleargs "${consoleargs} console=ttyS2"; fi

There is still get u-boot messages from serial port. I will need to use 3 UART for my application and there is only 2 I can use right now.

 

 

How can I disable this u-boot messages?

 

Thanks

[martinayotte]

From what I remember, changing  the above consolve argument only tell kernel to switch to new port.

To get rid of the u-boot logs, you need to re-compile a u-boot with CONFIG_SILENT_CONSOLE=y

[Hikmet TEKIN]

Hi martinayotte,

I am new to linux enviromemt. How can I re-compile u-boot with CONFIG_SILENT_CONSOLE=y? 

Thanks

[Hikmet TEKIN]

I added some patch to file /build/patch/u-boot/u-boot-sunxi/mine.patch and compiled the debian jessie and load image to SD card. but it is not disable the u-boot messages on serial.

 

I added these to patch file

diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -487,8 +487,8 @@ extern int soft_i2c_gpio_scl;

 #ifdef CONFIG_VIDEO
 #define CONSOLE_STDOUT_SETTINGS \
-	"stdout=serial,vga\0" \
-	"stderr=serial,vga\0"
+	"stdout=\0" \
+	"stderr=\0"
 #else
 #define CONSOLE_STDOUT_SETTINGS \
 	"stdout=\0" \

#define CONFIG_SILENT_CONSOLE=y \

 

I also changed the /boot/boot.cmd from this

if test "${console}" = "display" || test "${console}" = "both"; then setenv consoleargs "console=tty1"; fi
if test "${console}" = "serial" || test "${console}" = "both"; then setenv consoleargs "${consoleargs} console=ttyS0, 115200"; fi

to this

if test "${console}" = "display" || test "${console}" = "both"; then setenv consoleargs "console=tty1"; fi
if test "${console}" = "serial" || test "${console}" = "both"; then setenv consoleargs "${consoleargs} console=tty1"; fi

 

 

But I am still getting u-boot messages on serial output.

 

What should I do?

 

Thanks

[martinayotte]

The CONFIG_SILENT_CONSOLE=y needs to be added in the .config file before compiling u-boot.

[Hikmet TEKIN]

Am I gonna add it to this file 

build/config/kernel/linux-sun8i-dev.config

or 

build/config/kernel/linux-sun8i-default.config

 

Because these file header says "DO NOT EDIT ."

 

Could you please help me little bit more where should I enter it. I installed ubuntu 16.04 to my desktop and clone the armbian git repository. If you give me the folder direction I can just add it and re-compile it and than test it. 

 

Thanks

[martinayotte]

You need to create a small patch to will update the file build/cache/sources/u-boot/v2017.11/configs/orangepi_zero_defconfig

 

[Hikmet TEKIN]

martinayotte,

 

I am not very familiar with linux enviroment. I always worked in C for embedded processors. but now I need to use orange pi zero and could you please help me to make patch to update file.  I will try to create a patch file and put it to patch directory. when I compile the armbian. Is it apply patches to it or not? 

 

Thanks

[martinayotte]

The patch should look like the following, although not tested :

 

--- a/configs/orangepi_zero_defconfig
+++ b/configs/orangepi_zero_defconfig
@@ -15,3 +15,4 @@ CONFIG_SPL_SPI_SUNXI=y
 CONFIG_SUN8I_EMAC=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE=y
+CONFIG_SILENT_CONSOLE=y

 

[Hikmet TEKIN]

I added a patch file to /build/userpatches/u-boot/u-boot-sunxi/disable.patch

 

But when I try to compile it gives me error as failed what should I do?

 

 

Thanks for helps

[Igor]

5 hours ago, Hikmet TEKIN said:

But when I try to compile it gives me error as failed what should I do?

Look into debug/patching.log

[Hikmet TEKIN]

I tried the compile one more time and it compiled the armbian-debian-jessie 8 and I got the image file load it to sd card. I booted it up and check it on serial port. There is still u-boot messages. What can I do?  I added the log file and patch file.

disable.patch

patching.log

 

here is the serial output screenshot.

 

[martinayotte]

Your patch didn't applied because you deleted the context lines. Keep the all the lines here :

 

--- a/configs/orangepi_zero_defconfig
+++ b/configs/orangepi_zero_defconfig
@@ -15,3 +15,4 @@ CONFIG_SPL_SPI_SUNXI=y
 CONFIG_SUN8I_EMAC=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE=y
+CONFIG_SILENT_CONSOLE=y

 

[Hikmet TEKIN]

When I try as you wrote, it gives me error. Here is the log file for the error. I couldn't understand why it is giving error. Thanks

patching.log

disable.patch

[Hikmet TEKIN]

I compiled the armbian-debian-jessie with this patch. I found the error on patch. It just because of space character in front of the CONFIG_'s part. I fixed it and compiled but I couldn't disable u-boot messages. there is still u-boot messages. 

Thanks 

[martinayotte]

Euh ??? The spaces in front of CONFIG should be present ...

Did you looked at resulting build/cache/sources/u-boot/v2017.11/configs/orangepi_zero_defconfig ?

Also, did you look at resulting build/cache/sources/u-boot/v2017.11/.config ?

 

[Hikmet TEKIN]

8 hours ago, martinayotte said:

Did you looked at resulting build/cache/sources/u-boot/v2017.11/configs/orangepi_zero_defconfig ?

Yes, I checked the file, there is two file. One is ending with .config and other end with config.orig  I checked them one of them is original file and other is in use. Patch applied to it. I can see there is  CONFIG_SILENT_CONSOLE. It is at the end of file. 

[martinayotte]

That is strange that this option doesn't work. I've never tried it myself, but I presume lot of people did ...

Are you sure that this newly compiled u-boot is effectively installed on your boot media ?

 

[Hikmet TEKIN]

I run Ubuntu 16.04 on virtual machine. I just clone the armbian/build and it downloaded everything and compiled. How can I check that newly compiled u-boot? thanks

[martinayotte]

Does your build was a full image or only u-boot/kernel ?

If it is the second, you need to install the resulting u-boot-sunxi-with-spl.bin into proper sector of the existing SDCard.

 

[Hikmet TEKIN]

It is second one. I mean I get full image output. Am I going to change the file manually? Where is the file output and in img file? Thanks

[martinayotte]

If it is the second, then you don't get a full image.

 

To write the newly compiled u-boot, do the following where /dev/sd? is the unmounted existing sdcard :

dd if=build/cache/sources/u-boot/v2017.11/u-boot-sunxi-with-spl.bin of=/dev/sd? bs=1024 seek=8

 

[Hikmet TEKIN]

3 hours ago, martinayotte said:

If it is the second, then you don't get a full image.

 

To write the newly compiled u-boot, do the following where /dev/sd? is the unmounted existing sdcard :

dd if=build/cache/sources/u-boot/v2017.11/u-boot-sunxi-with-spl.bin of=/dev/sd? bs=1024 seek=8

 

Am I going to do it on Ubuntu or Armbian? 

[martinayotte]

In fact it can be done from both places, except that on Armbian, you will need first to copy the file u-boot-sunxi-with-spl.bin on the board, and then use the 'dd' with different arguments :

dd if=u-boot-sunxi-with-spl.bin of=/dev/mmcblk0 bs=1024 seek=8

So, maybe it would be faster doing the previous from your cross-compile host ...

 

[Hikmet TEKIN]

On 22.12.2017 at 1:58 AM, martinayotte said:

In fact it can be done from both places, except that on Armbian, you will need first to copy the file u-boot-sunxi-with-spl.bin on the board, and then use the 'dd' with different arguments :

dd if=u-boot-sunxi-with-spl.bin of=/dev/mmcblk0 bs=1024 seek=8

So, maybe it would be faster doing the previous from your cross-compile host ...

 

I made it and there is still u-boot messages on UART0 console. see the below picture. ( copy the file in ubuntu compile enviorement and on orangepi zero. 

 

 

I also tested the these commands ; CONFIG_SILENT_CONSOLE_UPDATE_ON_SET=y  and CONFIG_SYS_DEVICE_NULL=y  (I found them on another forum about u-boot silent "Stackexchange") and I also test them. But there is still messages on UART Console. 

 

Thanks

[martinayotte]

Doing a bit of googling, I found that having CONFIG_SILENT_CONSOLE=y only enable the code.

https://www.denx.de/wiki/DULG/UBootEnvVariables

But to make it effective, you need the environment variable "silent" to be set to any value.

It is also mentioned in cache/sources/u-boot/v2017.11/doc/README.silent.

 

[Hikmet TEKIN]

Where do I need to decleare the value “silent”?

[martinayotte]

https://lists.denx.de/pipermail/u-boot/2014-March/175689.html

 

[Hikmet TEKIN]

I could not disable it. I added the this 

 

#define CONFIG_EXTRA_ENV_SETTINGS \ "silent=1\0"

 

to u-boot include/configs/sunxi-common.h with a patch file but nothing changed. 

 

Where should declare it? İn boot.cmd?