When I connect board by consol to computer it shows loading OS but I can not type any word or password by Keyboard.
I have some benna pi M21 ultra but 3 from them have this problem.
Could you guide me How solve my problem ?
This is important for me
Try to catch all the messages with “minicom” or another terminal program and publish it on some pastebin.com or similar portal. We will take a look at it.
Ok, Thank you .we had about 15 benna pi that just 3 them have this problem.I got Debian on SD Card and it shows this Message.
If you are using minicom - try to check what are the options in menu:
press: “ctrl-a o”
and go to “serial port setup”
there should be:
F- hardware Flow Control: No
G - software flow control: No
What do you mean by “cannot type any word or password by keyboard”? Do you mean that there is no echo of typed characters?
Second thing - there may some problem with the filesystem on your SD card, because kernel mounted it as a read-only.
Yes I can not type any thing and my keyboard do not work in this state .
please explain more this message.
“Second thing - there may some problem with the filesystem on your SD card, because kernel mounted it as a read-only.”
My OS works on other Benna pi
Do you use minicom? If yes - have you checked those options I mentioned?
The filesystem (ext4?) on SD card may be corrupted - and because of that the kernel remounted it as a read-only to don’t allow any modifications on this filesystem and corrupt it more.
I use putty, Is Minicom like Putty?
I press: “ctrl-a o” but it do not work .
No minicom is quite different program. I don’t use putty but you can try to look for similar options like in minicom. I mean - turn off all the flow control in putty options.
Thank you. i searched it . it works like Putty . Minicom is a text-based serial port communications program.
but I can not enter User name and password . could you suggest a solution that check UBOOT ?
I don’t think that the problem is in UBOOT.
So how can type , Could you suggest a other solution
Maybe the problem is in flow control as I said. Check the settings of the serial port in your windows (?) system.
Thanks I checked it . It is correct .
Do you have other suggestion. This is important
Check the cables, switch the cables with the properly working boards, maybe the problem is in cable.
They are correct. I think it has a problem with hardware but i can not find it
Maybe RS232 (MAX3232) adapter is corrupted?
No, it works on other banana pi . on this board do not work.
Is there a way that i test my hardware ?
I test it my hard ware part of uart is correct with out SD . The problem is with SD CARD .
Do you know about this message
" ext4_mb_generate_buddy:755: group 1, 1 clusters in bitmap, 0
in gd [ 68.820096] EXT4-fs (mmcblk0p2): Remounting filesystem read-only"
I would try to use oscilloscope on RX pin on banana pi.
RX send data when I do not use sd card. Do you think my problem is with my OS ?