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Re: boot message

On Mon, 4 Apr 2005, Hubert Feyrer wrote:
On Sun, 3 Apr 2005, Marcin Jessa wrote:
> Is there a way one can make a booting kernel be silent and not to spit
> out all the info of what's going on? I wish my soekris build to be > quiet and display only boot loader's message and then go straight to > the login prompt.

There are two ways to get that done:

1) re-enable console=pc, and make sure you have gettys enabled, esp.
on your serial port (tty00).

2) Really tell the kernel to not print anything at all. I don't know to what extent that is supported, some support is available: printf(9) documents in the aprint_*() functions that you can set a "boothowto" variable to values like AB_QUIET, AB_VERBOSE and AB_SILENT.

I think the variable can be set from the bootprompt, setting a default in src/sys/kern/init_main.c would make sense to me. You'll need to change the C file for that.

In the bootloader, interrupt the countdown and type "boot -q". The result is not too impressive though:

> boot -q
booting hd0a:netbsd (howto 0x10000)
6746364+148460+522576 [376144+337471]=0x7c2458

These are from the bootloader, so will need to be dealt with separately.

BIOS CFG: Model-SubM-Rev: fc-00-01, 0x4074<EBDA,KBDINT,RTC,IC2,KBDF>
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
     The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 2.0.1 (GENERIC_IPSEC) #0: Sun Feb 27 00:57:26 CET 2005
total memory = 32380 KB
avail memory = 23780 KB
BIOS32 rev. 0 found at 0xf9700
Found mainbus0 (root)
Found cpu0 at mainbus0: (uniprocessor)
cpu0: Intel Pentium Pro (686-class), 801.13 MHz, id 0x613
cpu0: features a1bd<FPU,DE,PSE,TSC,MSR,MCE,CX8>
cpu0: features a1bd<PGE,CMOV>
cpu0: I-cache 8 KB 32B/line 4-way
cpu0: L2 cache 128 KB 32B/line 4-way
cpu0: 8 page colors
Found pci0 at mainbus0: configuration mode 1
Found pchb0 at pci0
pchb0: Intel 82441FX PCI and Memory Controller (PMC) (rev. 0x02)
Found pcib0 at pci0
pcib0: Intel 82371SB PCI-to-ISA Bridge (PIIX3) (rev. 0x00)
Found piixide0 at pci0: disk controller
piixide0: primary channel interrupting at irq 14
Found atabus0 at piixide0
piixide0: secondary channel interrupting at irq 15

As Jason says elsewhere, the verbosity here is mainly from various i386
files using printf rather than aprint_normal. The duplication is down to
the standard verbose output coming from print and then the AB_QUIET flag
using aprint_naive to give the "Found" lines.

I didn't find anything in the boot(8) manpage that indicates how to set AB_SILENT (or AB_QUIET?). Try modifying the named .c file.

In an ideal world:

-q = AB_QUIET => Found xx at yy
-z = AB_SILENT => Detecting hardware, twiddle, then done.

A quick hacky work around is to duplicate the console/buffer logic from 
to printf as below. If you want it completely silent, comment out the lines in 
that print "Detecting hardware", "done" and stick a return in twiddle() (don't 
just force
config_do_twiddle to 0 as this is logically mixed up with AB_QUIET mode in 

--- kern/subr_prf.c.orig        2004-03-23 13:22:04.000000000 +0000
+++ kern/subr_prf.c     2005-05-10 17:02:11.000000000 +0100
@@ -735,12 +754,17 @@
 printf(const char *fmt, ...)
        va_list ap;
-       int s;
+       int s, flags = TOLOG;
+       if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 ||
+           (boothowto & AB_VERBOSE) != 0)
+               flags |= TOCONS;


        va_start(ap, fmt);
-       kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap);
+       kprintf(fmt, flags, NULL, NULL, ap);



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