Om <omanakuttan@xxxxxxx> wrote:
Alex wrote:
> Hi,
>
> static int __init debug_kernel(char *str)
> {
> if (*str)
> return 0;
> console_loglevel = 10;
> return 1;
> }
>
> static int __init quiet_kernel(char *str)
> {
> if (*str)
> return 0;
> console_loglevel = 4;
> return 1;
> }
>
> __setup("debug", debug_kernel);
> __setup("quiet", quiet_kernel);
These are handlers for kernel parameters.
to invoke these functions, pass "debug" and "quiet" respectively from
the boot loader as kernel command line.
If you pass both, I think the latter will take precedence. Please
correct me if I am wrong.
HTH,
om.
***************
From: Jim Bauer <jfbauer@xxxxxxx>
Date: Fri, 28 Jan 2005 22:13:45 -0500
Those 2 routines are called at boot time if you specify the
corresponding "debug" or "quiet" arguments to the kernel from the boot
loader.
******************************************
OK - Thanks ... but, as i previously specified in my another posting "booting kernel with init_console( ) commented out - is it theoreticall y possible ?" - I am using "custom" bootloader (I have no code for), which doesn't allow for "command line arguments" ...
Is "quiet" used as default ?
So it appears I could specify "debug" instead in .config as:
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="console=ttyCPM0 panic=3 root=/dev/ram debug"
?
I presume usage of "debug" in command line will "kick-in" printing of additional debugging output (comparing with "quiet") so will
CONFIG_LOG_BUF_SHIFT=14 be "automatically increased to 16 to accommodate the need for larger size of "log buffer" ?
(or is it "user" responsibility ?).
Actually (in 2.6) I tried to change from 14 to 16 in above but it gets
reset back to 14 during the build - anyone else tried and noticed that ?
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