Hi folks,
I've got a very strange problem w/ v4.13 (on imx6):
it tries to open the initial console, before even attempt to mount the
root fs, which obviously is doomed to fail. (directly passing root=
via cmdline - no initrd etc)
What puzzles me most: prepare_namespace() is only called from
kernel_init_freeable() - after it tried to open console (only when no
ramdisk_execute_command found).
Anyone have an idea what could be wrong here ?
--mtx
On 10.09.2017 11:09, mtx wrote:
> it tries to open the initial console, before even attempt to mount the > root fs, which obviously is doomed to fail. (directly passing root=>
via cmdline - no initrd etc)
Solved it. For the record: the uart2 node was still disabled, so the
kernel did allocate a console for the port, but no tty_driver assigned.
tty_lookup_driver() (tty_io.c) is called on opening tty devices (such as
/dev/console). it asks console_device() (in printk.c), which scans the
consoles list for one with a tty_driver.
As my DT left the console's uart port disabled, the corresponding device
wasn't initialized, thus leaving the console w/o assigned tty_driver.
BTW: maybe we should think about some logic which spits out a warning,
or maybe implement an own special tty_driver for /dev/console, which
goes to the active console(s), just like printk() does.
--mtx