Hi Everyone,
newbie question.
Is there a way to show more kernel messages during boot-up maybe building my image with some peculiar
set-up in menuconfig or does Openwrt give no options about this ? With messages I mean the ones
you can get typing #dmesg to figure out what is going on at boot time.
Any feedback would be greatly appreciated. Thank you
Hi,
can't find a solution. Googling around I found different stuffs maybe its because of different linux kernel version and linux distribution.
So far what I am getting. Working with openwrt 18.06.1 - kernel 4.9 - gl-inet-ar150 ar9330/1 Soc.
My u-boot bootargs:
uboot> printenv
bootargs=console=ttyATH0,115200 board=domino root=31:03 rootfstype=squashfs,jffs2 noinitrd mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,1280k(kernel),14656k(rootfs),64k(nvram),64k(art)ro,15936k@0x5000)
My kernel dmesg at starup`
[ 0.000000] Kernel command line: board=GL-AR150 mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,16000k(firmware),64k(art)ro console=ttyATH0,115200 rootfstype=squashfs noinitrd
My openwrt/target/linux/ar71xx/config-4.9
CONFIG_CMDLINE="rootfstype=squashfs noinitrd"
CONFIG_CMDLINE_BOOL=y
# CONFIG_CMDLINE_OVERRIDE is not set
from http://redsymbol.net/linux-kernel-boot-parameters/4.9/
I get:
ignore_loglevel [KNL]
Ignore loglevel setting - this will print /all/
kernel messages to the console. Useful for debugging.
We also add it as printk module parameter, so users
could change it dynamically, usually by
/sys/module/printk/parameters/ignore_loglevel.
is there a way to add 'ignore_loglevel' somewhere in the aboves
to try to get more messages, or maybe I am already getting them all,
before the part where I get at startup ?
[ 3.580088] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 3.596699] init: - preinit -
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 7.766058] jffs2: notice: (359) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
If I have to do it at u-boot level using
setenv - set environment variables
does setenv saves them somewhere ? or change them just in memory ?
I don't' want to brick my bootloader, from what I understood (and I could be wrong)
the bootloader is not touched when I flash my gl-inet-ar150 with openwrt sysupgrade.bin.
What additional kernel messages are you missing or looking for?
something about:
[ 0.664483] libphy: Fixed MDIO Bus: probed
[ 0.685293] libphy: ag71xx_mdio: probed
[ 1.317699] ag71xx-mdio.1: unknown phy id '0067:7861' +-----------------------------+
[ 1.323631] NET: Registered protocol family 10
problem is [ 1.317699] ag71xx-mdio.1: unknown phy id '0067:7861'
I am messing up things about board config platforms and drivers
I dont know about so I need the more info I can get
HHi Tmomas !
Is there a way to add more printk() messages to my Mach-gl-ar150.c or dev-Eth.h or net drivers ? Or openwrt Linux 4.9 uses something else ? I found some starting points in kernel debugging on Bootlin slides:
© Copyright 2004-2018, Bootlin. Creative Commons BY-SA 3.0 license. Latest update: November 2, 2018.
But I don’t know if they are relevant to openwrt Linux 4.9 ?
Do you think I should try to figure out something from them ? I am very new to embedded Linux and more new to Linux so I am not sure openwrt was the right starting point ! Are these bootlin slides a good starting point ? Or I should look at something else ?
Hi
used
> cat proc/sys/kernel/printk
7 4 1 7
according to this (https://elinux.org/Debugging_by_printing) is maximum
To determine your current console_loglevel you simply enter:
$ cat /proc/sys/kernel/printk
7 4 1 7
current default minimum boot-time-default
what I am not sure its if this apply to events before
[ 3.580088] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 3.596699] init: - preinit -
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 7.766058] jffs2: notice: (359) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
or not ?
hi
did you ever find solution to this? i'm having same issue with ath10k dbg messages, warn and err are printed on serial console, dbg messages are not. i can view them in dmesg but it doesn't help in cases when system crashed
ok, ignore_loglevel works and nice thing is full kernel recompile is not even needed