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Re: [PATCH] kill prom_printf

To: Jan-Benedict Glaw <>
Subject: Re: [PATCH] kill prom_printf
From: "Maciej W. Rozycki" <>
Date: Tue, 17 Jun 2003 15:57:13 +0200 (MET DST)
In-reply-to: <>
Organization: Technical University of Gdansk
Original-recipient: rfc822;
On Tue, 17 Jun 2003, Jan-Benedict Glaw wrote:

> If we constantly add (new) kernel arguments, we may at some time face
> the problem that the calling PROM/firmware/whatever cannot handle a
> command line which is *that* long. IIRC DECstations have a quite limited
> prompt length. This hurts for "3/tftp():vmecoff root=/dev/ram
> nfsroot=/nfsroot/decxxxx ip=bootp console=ttyS2 console=tty0
> early_printk=arc"

 That has already been trained by the Alpha people.  I think we simply
need a bootloader capable of handling network boots -- with the REX
firmware it shouldn't be that difficult.  For disk loads I suppose it's
already handled by delo (I haven't checked).  We don't have a tape loader,
do we?

 BTW, you may omit "nfsroot=" above if you send a root path in a BOOTP
reply and also "ip=bootp" shouldn't be necessary if the causing bug was
fixed (I have a temporary patch).  The limit is 37 characters for the
"boot" variable (due to the limitation of the BBU RAM) and a bit higher
for an explicitly typed in command line (I think it's 80 characters, but I
can't remember for sure). 

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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