problem with Mod-RS485-ISO on UETX

[sandro]

Hi at all.
I have a A13 rev C.
I use script_GPIO_LCD_800x480.
At start, maybe because in UART1 i have teh bootloader, the system don't start if I have the Mod-RS485-ISO connect on UETX.
What can I do?

Thanks
Sandro

[jwischka]

Have you tried rebuilding u-boot with a different UART?

[sandro]

yes but don't work for me.
I have only 2 uart (0 and 1).
I need the UART1, but the UART0 in A13 rev C is shared with the SD.
If I uncomment  #define CONFIG_UART0_PORT_F in sun5i.h


/* Define this to have serial channel 1 (UART0) redirected to SD port */
/* #define CONFIG_UART0_PORT_F */

#ifndef CONFIG_CONS_INDEX
#ifdef CONFIG_UART0_PORT_F
#define CONFIG_CONS_INDEX         1         /* UART0 on PORT_F (sdcard) */
#else
#define CONFIG_CONS_INDEX         2         /* UART1 */
#endif
#endif


System don't start too.

Thanks

[vinifr]

If you have a VGA LCD you can changed console from /dev/ttyS0 to /dev/tty[1-6].
Enable /dev/tty[1-6] and disable /dev/ttyS0 in /etc/inittab

Code Select Expand


1:2345:respawn:/sbin/getty 38400 tty1
2:23:respawn:/sbin/getty 38400 tty2
3:23:respawn:/sbin/getty 38400 tty3
4:23:respawn:/sbin/getty 38400 tty4
5:23:respawn:/sbin/getty 38400 tty5
6:23:respawn:/sbin/getty 38400 tty6

#T0:2345:respawn:/sbin/getty -L ttyS0 115200 linux


Code Select Expand


setenv bootargs console=/dev/tty1 root=/dev/mmcblk0p2 rootwait panic=10 ${extra}
fatload mmc 0 0x43000000 script.bin
fatload mmc 0 0x48000000 uImage
bootm 0x48000000


[sandro]

The problem it's on the login or on the kernel messagges, but on the bootloader.
With the Mod-RS485-ISO the bootloader seem like I press the ctrl-c at start.
I tried to recompile the bootloader too (with silent option) but it doesn't work.
I tried to give the feed at Mod-RS485-ISO with a gpio, so it's 0V at the start, but it doesn't work too.

Thanks

[JohnS]

Can you get a log of the messages on uart1?  (Such as by using screen or putty)

I'm not clear how far it gets before going wrong.

I don't think u-boot cares about what is on uart0 but let's see the log

I do it on linux using:
screen -L /dev/ttyUSB0 115200

and it writes screenlog.0 for example

[sandro]

I can't access to Linux.
If I start the system with Mod-RS485-ISO on UETX the system remains with black screen
If without restart the system, I connect on the UART1 a serial, I see that the system is stopped here:

Unknown command 'U-Boot' - try 'help'
sun5i#

then on the bootloader

[JohnS]

What was before that?  We need all of it from when you press Reset

[sandro]

I connect the MOD-rs485-iso on the uext. I feed the board. I wait it start but it don't start.
If now I connect a rs232 interface on the UART1 I can see the bootloader prompt.

[JohnS]

Yes but what was on the uart BEFORE what you posted?  All the stuff from when you reset the board.  I don't see any way to help you without the data.  Do not press any keys to interrupt the board's attempt to boot.