U-Boot interrupt

shlomi perlman

Intellectual 835 points

Other Parts Discussed in Thread: DM3730

Hi,

I'm trying to interrupt the u-boot on dm3730 in order to get the u-boot command line with no luck.

im running minicom on /dev/ttyS0 (or 1,2,3).

how do i make it work?

over 8 years ago

0 Cvetolin Shulev-XID over 8 years ago

TI__Guru 65405 points

Hi Shlomi,

You should press a key during booting and see the following message:
Hit any key to stop autoboot:
But before that you should have run correctly configured minicom but the configuration could varies depending on the environment (UART connection to the PC, software and the board type in some extend). In some cases when the PC use USB to UART adapter the minicom configuration is /dev/ttyUSB0.
Could you share more details?

BR
Tsvetolin Shulev

0 Cvetolin Shulev-XID over 8 years ago in reply to Cvetolin Shulev-XID

TI__Guru 65405 points

Shlomi,

The linked article could be useful about UART configuration:
elinux.org/BeagleBoardBeginners

BR
Tsvetolin Shulev

0 shlomi perlman over 8 years ago in reply to Cvetolin Shulev-XID

Intellectual 835 points

I tried /dev/ttyUSB0 and minicom says it doesn't exist (I'm using a usb cable).
my settings:

A - Serial Device : /dev/ttyS0
B - Lockfile Location : /var/lock
C - Callin Program :
D - Callout Program :
E - Bps/Par/Bits : 9600 8N1
F - Hardware Flow Control : No
G - Software Flow Control : No

also tried 115200.

does it suppose to recognize the board automatically when it boots?

0 shlomi perlman over 8 years ago in reply to shlomi perlman

Intellectual 835 points

any idea?

0 Prabhakar Lad over 8 years ago in reply to shlomi perlman

Guru 11260 points

Hello,

When you use a USB to serial the /dev/ttyUSBX node is created, so you need to tell minicom about it,

just type in 'minicom -s' traverse to "Serial Port setup" select option A edit it and save it.

Cheers,

--Prabhakar Lad

0 shlomi perlman over 8 years ago in reply to Prabhakar Lad

Intellectual 835 points

that is exactly the problem...

the host doesn't create this node.

maybe i need to configure something on the dm37 side so it will tell the host its a serial port?

0 Prabhakar Lad over 8 years ago in reply to shlomi perlman

Guru 11260 points

No you dont need to do anything on your dm37xx side, what OS are you using windows/Linux ?

Cheers,
--Prabhakar Lad

0 shlomi perlman over 8 years ago in reply to Prabhakar Lad

Intellectual 835 points

linux ubuntu 10.04 LTS

0 Prabhakar Lad over 8 years ago in reply to shlomi perlman

Guru 11260 points

Can you post the output of 'lsusb' when the USB2SERIAL is connected to you Desktop/Laptop.

Cheers,
--Prabhakar Lad

0 shlomi perlman over 8 years ago in reply to Prabhakar Lad

Intellectual 835 points

OK i connected successfully to /dev/ttyUSB0, turns out the tx/rx pins weren't good.

now i'm seeing data in 0xff format instead of readable data. how do i fix it?

0 shlomi perlman over 8 years ago in reply to shlomi perlman

Intellectual 835 points

when i run putty in a windows terminal i can read the data,
but when i run it in ubuntu (or minicom) this is what i get:
(with the same settings)

\0x16\0x1b\0x01\0x01\0x1b\0x05\0x1b\0x16\0x1c\0x1a\0x1b\0x01\0x03\0x1f

\0x1b\0x16\0x1c\0x19\0x12\0x06\0x06\0x09\0x1b\0x05\0x15\0x13\0x03\0x17\0x18\0x09\0x03\0x09\0x05\0x1b\0x16\0x1e\0x0b\0x0e\0x09\0x02\0x18\0x1f\0x1b\0x07

\0x01

\0x11\0x14\0x0b\0x14\0x06\0x1e

\0x0c\0x19\0x07\0x03\0x03\0x13\0x0f\0x03\0x06

\0x19\0x06\0x1d

\0x02\0x05\0x13\0x13\0x0f\0x13\0x03\0x12\0x0b\0x05\0x03\0x0b\0x11\0x0e\0x1b\0x03\0x17\0x1a

\0x03\0x06\0x18\0x0f\0x01\0x19

\0x01\0x03\0x0b

also, how do i interrupt the boot to get into the u-boot command line?
the terminal doesn't accept any key-press while loading.

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U-Boot interrupt