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Re: Boot flags in the kernel.

To: Alex deVries <>
Subject: Re: Boot flags in the kernel.
From: "William J. Earl" <>
Date: Mon, 26 Jan 1998 09:36:43 -0800
Cc: SGI Linux <>
In-reply-to: <>
References: <>
Alex deVries writes:
 > I'm not sure if what I'm trying to do is possible. I'm trying to implement
 > the same rootflags that are passwd within the kernel image in i386 into
 > the MIPS kernel. 
 > In i386 there's a portion of the boot image reserved for these flags;
 > they're things like console type, initial filesystem, initial ramdisk
 > location, etc.  
 > It's traditionally been more important to have this feature in i386
 > because there wasn't anything nice like the PROMs on MIPS or Sparcs.
 > But, there _is a good reason to have it; for install or rescue images it's
 > nice to be able to boot with compressed initial ramdisk within the same
 > boot image without having to pass the ramdisk offset on command line
 > manually.
 > Where in the kernel would we put this data?

       I am sure where you should put it, but bear in mind that the
command line options and environment are passed to the kernel much as
if it were a user main program (as argc, argv, and envp, in $a0, $a1,
and $a2), by sash or the PROM.  You can get things like the console
variable that way (console=g means textport and console=d means
serial console). 

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