[LinuxBIOS] Console debug (boot time)

Adam Talbot talbotx at comcast.net
Wed Apr 13 19:15:56 CEST 2005

Hummm.  So if console slows boot time, how about loading the vga bios stuff. 
Does this slow down the overall boot time of linux bios?

----- Original Message ----- 
From: "Richard Smith" <smithbone at gmail.com>
To: "Adam Talbot" <talbotx at comcast.net>
Cc: "Ronald G. Minnich" <rminnich at lanl.gov>; <linuxbios at openbios.org>
Sent: Wednesday, April 13, 2005 8:14 AM
Subject: Re: [LinuxBIOS] Console debug (boot time)

On 4/13/05, Adam Talbot <talbotx at comcast.net> wrote:
> At what speed do I need to set my console output in linux bios to have it
> not effect boot time of linux bios? 19200, 9600, 4800? This is in standard
> debug, I dont need to see all the information on the screen. Just the key
> points.

Well ouptut at any speed at all affects the boot time so as terse of
output as you can stand is the best speed up.  But if you want ot
minimize the impact of the serial delay then set it as fast as
possible.  I run mine at 115200.

9600 baud    = 1.042 mS per byte.
115200 baud = 86 uS per byte.

So @115200 in 1 second you can dump 11,500 characters vs 960 @ 9600.

Richard A. Smith

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