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Re: initrd problem

To: linux-mips@linux-mips.org
Subject: Re: initrd problem
From: Ed Martini <martini@c2micro.com>
Date: Tue, 15 Mar 2005 14:37:45 -0800
In-reply-to: <20050314110101.GF7759@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <4230DB4C.7090103@c2micro.com> <20050314110101.GF7759@linux-mips.org>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)
Ralf Baechle wrote:

On Thu, Mar 10, 2005 at 03:42:04PM -0800, Ed Martini wrote:
Should I put CONFIG_EMBEDDED_RAMDISK and its ilk back into my kernel, or write an ELF version of addinitrd? Other ideas?

Things vanish for a reason ...  Try CONFIG_INITRAMFS_SOURCE instead.

 Ralf

Ok. Then let's get rid of it completly, and provide a replacement that works.

There were vestiges of embedded initrd in the ld script that were confusing when trying to sort things out. That, in conjunction with Documentation/initrd.txt made it hard to discover early user space and initramfs when coming from the old world (2.4).

Also, unless you move the location of .init.ramfs, it gets freed twice, leading to a panic.

From the documentation alone it's impossible to figure out how to build your initramfs. In various places the docs refer to the initial executable as /linuxrc, /kinit, /init, and possibly others. If you read init/main.c you see that for an initramfs, your initial process will be started from /init.

diff -urN linux-2.6.11-linux-mips.org/arch/mips/kernel/vmlinux.lds.S linux/arch/mips/kernel/vmlinux.lds.S --- linux-2.6.11-linux-mips.org/arch/mips/kernel/vmlinux.lds.S 2005-03-15 13:41:51.000000000 -0800
+++ linux/arch/mips/kernel/vmlinux.lds.S 2005-03-15 14:34:00.339164936 -0800
@@ -54,13 +54,6 @@

    *(.data)

-   /* Align the initial ramdisk image (INITRD) on page boundaries. */
-   . = ALIGN(4096);
-   __rd_start = .;
-   *(.initrd)
-   . = ALIGN(4096);
-   __rd_end = .;
-
    CONSTRUCTORS
  }
  _gp = . + 0x8000;
@@ -82,6 +75,13 @@

  _edata =  .;   /* End of data section */

+   /* Align the initial ramfs image on page boundaries. */
+   /* It will be freed by init/initramfs.c */
+  . = ALIGN(4096);
+  __initramfs_start = .;
+  .init.ramfs : { *(.init.ramfs) }
+  __initramfs_end = .;
+
  /* will be freed after init */
  . = ALIGN(4096);  /* Init code and data */
  __init_begin = .;
@@ -118,10 +118,6 @@
  .con_initcall.init : { *(.con_initcall.init) }
  __con_initcall_end = .;
  SECURITY_INIT
-  . = ALIGN(4096);
-  __initramfs_start = .;
-  .init.ramfs : { *(.init.ramfs) }
-  __initramfs_end = .;
  . = ALIGN(32);
  __per_cpu_start = .;
  .data.percpu  : { *(.data.percpu) }


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