[Bug 1621] New: switch_root: can't execute '/sbin/init': No such file or directory

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=1621

              Host: microblaze-unknown-linux-gnu
            Target: microblaze-unknown-linux-gnu
             Build: i686 32-bit, Fedora Core 8
           Summary: switch_root: can't execute '/sbin/init': No such file or
                    directory
           Product: Busybox
           Version: 1.16.x
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: jpl at xiphos.ca
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Created an attachment (id=1561)
 --> (https://bugs.busybox.net/attachment.cgi?id=1561)
linuxrc script from initramfs

I'm running this on microblaze CPU on a Xilinx Virtex-4 FPGA.  I have tested
this on 1.16.0, 1.16.1 and 1.15.3, all with the same results.

I followed several examples of the initramfs bootscript that should be used to
call switch_root, and I think I have them okay, except that I'm always coming
across the same error. 'No such file or directory'.

My SD card with a root filesystem is mounted at /mnt.

I have tried the following as the last argument to switch_root.

 * init
 * linuxrc
 * /linuxrc
 * /init
 * sbin/init
 * /sbin/init
 * /mnt/sbin/init

Nothing works.  I have attached by initramfs linuxrc script.

Also, this appears if I use 'ash', or 'hush' as my default shell.

Bootlog from my initramfs /linuxrc is as follows.

--START--
Switch root script...
Mounting /proc
Looking at CPU setup
CPU-Family:     MicroBlaze
FPGA-Arch:      virtex4
CPU-Ver:        7.20.d
CPU-MHz:        100.00
BogoMips:       49.56
HW:
 Shift:         yes
 MSR:           yes
 PCMP:          yes
 DIV:           yes
 MMU:           3
 MUL:           v2
 FPU:           v2
 Exc:           unal 
Icache:         32kB
Dcache:         32kB
                write-through
HW-Debug:       yes
PVR-USR1:       00
PVR-USR2:       00000000
Loading SD Card driver
[    5.310000] q5sd driver $Revision: 24 $
[    5.310000] q5sd_of_probe: compatible: xlnx,sdcardctrlx-plb46-v1
[    5.310000] OF BaseAddress: 25000000
[    5.310000] OF IRQ: 8
[    5.310000] of_register_platform_driver returned 0
[    5.310000] SDCard data buffer remapped from 0x25000000 to 0xc8060000
[    5.310000] SDCard registers remapped from 0x25008000 to 0xc8068000
[    6.060000]  q5sda: q5sda1 q5sda2
Modprobe finished with result 0
Checking root partition
e2fsck 1.41.11 (14-Mar-2010)
Superblock last write time (Thu Apr 22 22:15:18 2010,
        now = Thu Jan  1 00:00:06 1970) is in the future.
Fix? yes

/dev/q5sda2: clean, 739/243840 files, 15476/486990 blocks (check after next
mount)
Mounting ext2 from partition 2
ls /mnt
bin config dev etc home init lib linuxrc lost+found proc root sbin sys tmp usr
var
Switching root
linuxrc: lrwxrwxrwx    1 0        0                9 Apr 22  2010 /mnt//init ->
sbin/init
CWD before execv: /
switch_root: can't execute '/init': No such file or directory
[    7.400000] Kernel panic - not syncing: Attempted to kill init!
--END--


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