Disabling frame buffer

[David Madore <david.madore@ens.fr>]

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Hi.

Suppose I compiled a kernel (2.4.19) with graphical frame buffer
support (Radeon, to be precise, but I don't suppose it matters), and
suppose I decide I really want to boot in plain ol' text mode (80x25
with no embellishments and no penguin logo) just for once.  Is there
some way I can do this (other than recompiling the same kernel but
without this frame buffer support)?

Before someone suggests this, I did try passing vga=259 as an option,
but that doesn't change anything, it still switches to graphic mode
sometime later in the boot process.  Initially the log says

Console: colour VGA+ 80x25

and later it changes its mind,

radeonfb: ref_clk=2700, ref_div=12, xclk=16600 from BIOS
Console: switching to colour frame buffer device 80x30
radeonfb: ATI Radeon 7500 QW  DDR SGRAM 64 MB
radeonfb: DVI port no monitor connected
radeonfb: CRT port CRT monitor connected
vga16fb: initializing
vga16fb: mapped to 0xc00a0000
fb1: VGA16 VGA frame buffer device

I know it's a bit silly to insist on getting a plain text mode, and
even sillier not to want to just recompile, but I'd still appreciate
some help here.

Thanks,

-- 
     David A. Madore
    (david.madore@ens.fr,
     http://www.eleves.ens.fr:8080/home/madore/ )
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’A\x10\x17zœ¡\G–w׳\x7f½u6³\a·From linux-kernel-owner+willy=40w.ods.org@vger.kernel.org  Sat Aug 24 10:42:37 2002
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Date: 	Sat, 24 Aug 2002 09:41:25 +0100
From: Russell King <rmk@arm.linux.org.uk>
To: Jeff Garzik <jgarzik@mandrakesoft.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Andre Hedrick <andre@linux-ide.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       "Heater, Daniel (IndSys, GEFanuc, VMIC)" <Daniel.Heater@gefanuc.com>,
       "'Padraig Brady'" <padraig.brady@corvil.com>,
       "'Linux Kernel'" <linux-kernel@vger.kernel.org>
Subject: Re: IDE-flash device and hard disk on same controller
Message-ID: <20020824094125.A30109@flint.arm.linux.org.uk>
References: <Pine.LNX.4.10.10208222014450.13077-100000@master.linux-ide.org> <20020823114433.10784@192.168.4.1> <3D66E944.9080507@mandrakesoft.com>
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On Fri, Aug 23, 2002 at 10:02:44PM -0400, Jeff Garzik wrote:
> Basically think about the consequences of trying to handle a completely 
> unknown state -- if you are going to attempt to handle this you would 
> need to check for data, not just the BSY bit.  And read the data into a 
> throwaway buffer, if there is data to be read, or write the data it's 
> expecting.
> 
> So it's not just the busy bit :)

I notice everyone decided to miss replying to my mail about PCMCIA
IDE devices, which will trip you up here.  Could it be because I've
identified a real problem here?

- You plug the IDE device in.
- Power gets applied.
- cardmgr loads ide_cs.
- cardmgr binds ide_cs, which registers with the IDE layer.

The above happens in 10s of milliseconds, well before the hard drive
platters have been spun up.  Meanwhile, as defined by the T13 specs,
the BSY bit can be set for up to 31 seconds.

You're saying "completely unknown state".  I say "T13 defines this
state extremely well, and defines what happens from the drives point
of view at the end of the power on reset sequence extremely well."

I also say that your implementation above is, in andrespeak, a "bad
host" because it doesn't follow the T13 power on reset sequence
properly.

And yes, people _do_ use PCMCIA IDE drives with Linux.

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html