Linux hung while opening /dev/console by ttymxc0

zhb1984 — Tue, 05 Jan 2021 10:17:21 GMT

Hello,

I am using imx6sx to develop application with customized board. The Linux kernel was downloaded via TFTP and it was started. It should mount the rootfs via NFS. The bootargs was 'console=ttymxc0,115200 root=/dev/nfs rw nfsroot=192.168.1.3:/home/zhb/arm/linux/nfs/rootfs-futura,v3 ip=192.168.1.100:::255.255.255.0::eth0:off'. When the kernel outputed the following:

[ 5.816696] IP-Config: Complete:
[ 5.819990] device=eth0, hwaddr=00:04:9f:06:6a:4d, ipaddr=192.168.1.100, mask=255.255.255.0, gw=255.255.255.255
[ 5.830780] host=192.168.1.100, domain=, nis-domain=(none)
[ 5.836840] bootserver=255.255.255.255, rootserver=192.168.1.3, rootpath=
[ 5.844672] ALSA device list:
[ 5.847901] No soundcards found.

Nothing was outputed then. Then I did 3 test cases:

1) Use tty1(LVDS LCD) as the console, then everything is OK. Rootfs was mounted successfully. The bootargs was 'console=tty1 root=/dev/nfs rw nfsroot=192.168.1.3:/home/zhb/arm/linux/nfs/rootfs-futura,v3 ip=192.168.1.100:::255.255.255.0::eth0:off'.

2) Use ttymxc0 as the console, but without rootfs. It outputed the error messages about filesystem.

[ 2.585383] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[ 2.592954] Please append a correct "root=" boot option; here are the available partitions:

The bootargs was 'console=ttymxc0,115200'.

3) Use ttymxc0 as the console, with boorargs 'console=ttymxc0,115200 ip=192.168.1.100:::255.255.255.0::eth0:off'. The result was same as the original one.

I don't know what to do next. Could someone give any advice?

Thanks a lot!

Re: Linux hung while opening /dev/console by ttymxc0

igorpadykov — Tue, 05 Jan 2021 11:30:40 GMT

Hi zhb1984

what bsp used in the case, one can try latest from source.codeaurora.org/external/imx/linux-imx repository, check appropriate dts file:

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm/boot/dts/imx6sx-sdb.dtsi?h=imx_5.4.70_2.3.0

Best regards
igor

Re: Linux hung while opening /dev/console by ttymxc0

zhb1984 — Wed, 06 Jan 2021 08:16:38 GMT

I just use the latest version, 5.4.70

Re: Linux hung while opening /dev/console by ttymxc0

zhb1984 — Wed, 06 Jan 2021 08:23:23 GMT

The current version I am using is 5.4.70. But I try the old version of 4.1.15, and it works. I don't know what's the difference between them.

i.MX Processors中的主题 Linux hung while opening /dev/console by ttymxc0

Linux hung while opening /dev/console by ttymxc0

Re: Linux hung while opening /dev/console by ttymxc0

Re: Linux hung while opening /dev/console by ttymxc0

Re: Linux hung while opening /dev/console by ttymxc0