[Clfs-support] Oops booting a working kernel cross-compiled with CLFS cross-toolchain

Thu Apr 7 06:51:16 PDT 2011

Hello forum!

I just have build my own uClibc EABI toolchain for my ARMv4t, based on the
CLFS book. All the userspace libs/bins I have built, seem to compile fine.
The CLFS setup used was this:

CLFS_HOST=i486-cross-linux-gnu
CLFS_TARGET=armv4-linux-uclibceabi
CLFS_FPU=
CLFS_ARM_ARCH=armv4t
CLFS_ARM_MODE=arm
CLFS_ARCH=arm
CLFS_ABI=aapcs-linux
CLFS_ENDIAN=little
CLFS_FLOAT=soft

Now I was trying to cross-compile my running kernel sources with that CLFS
cross-compiler built from scratch. My kernel is a customized version for my
board, but I know this kernel runs fine on my ARM target, because I have
tested it cross-compiling with a different toolchain.

I though building my kernel sources with the CLFS EABI cross-compiler, I
should also build a working kernel. But it doesn't work at all.

The kernel cross-compiled fine, following the steps:

    $ make ARCH=${CLFS_ARCH} CROSS_COMPILE=${CLFS_TARGET}- mrproper
    $ make ARCH=${CLFS_ARCH} CROSS_COMPILE=${CLFS_TARGET}- distclean
# 'cp' my .config here
    $ make ARCH=${CLFS_ARCH} CROSS_COMPILE=${CLFS_TARGET}- menuconfig
    $ make ARCH=${CLFS_ARCH} CROSS_COMPILE=${CLFS_TARGET}- make

Once installed on the flash, I boot the system from the u-boot as usual. The
kernel uncompresses, initializes all the subsystems, and even mounts the
rootfs fine. But after "freeying init memory", I suppose almost ready to
start the init process (a busybox applet), it hangs with an Oops with number
"817".

I checked my .config is properly configured with the following flags
enabled:

    CONFIG_AEABI=y
    CONFIG_OABI_COMPAT=y

I installed the sanitized headers of my running kernel when building my own
CLFS toolchain (It is a kernel 2.6.30.4, so I suppose that should not
matter, or it could be?).

Hope you can give some advise to discover the problem based on your own
experience.

Thank you very much!!
Best regards,
  -- Ivan

This is the kernel crash, hope it can be helpful:

VFS: Mounted root (yaffs2 filesystem) on device 31:2.
Freeing init memory: 112K
Unable to handle kernel paging request at virtual address 00100104
pgd = c3a24000
[00100104] *pgd=339ea031, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1]
Modules linked in:
CPU: 0    Not tainted  (2.6.30.4 #1)
PC is at rmqueue_bulk.clone.39+0x54/0x7c
LR is at __rmqueue+0x20/0x238
pc : [<c006562c>]    lr : [<c00653c0>]    psr: 80000093
sp : c381d9f0  ip : c03b7764  fp : c381da14
r10: 00000013  r9 : c039ce20  r8 : 00000002
r7 : 00000002  r6 : c03b773c  r5 : 00000003  r4 : c03f5338
r3 : c03f5338  r2 : 00100100  r1 : 00000000  r0 : c03f5320
Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: c000717f  Table: 33a24000  DAC: 00000015
Process init (pid: 1, stack limit = 0xc381c268)
Stack: (0xc381d9f0 to 0xc381e000)
[...
a bunch of stack addresses
...]
Backtrace:
[<c00655d8>] (rmqueue_bulk.clone.39+0x0/0x7c) from [<c006580c>]
(get_page_from_)
 r8:60000013 r7:00000001 r6:c03b773c r5:c03b775c r4:00000002
r3:00000002
[<c0065654>] (get_page_from_freelist+0x0/0x41c) from [<c0065b18>]
(__alloc_page)
[<c0065a70>] (__alloc_pages_internal+0x0/0x424) from [<c00681b4>]
(__do_page_ca)
[<c00680d0>] (__do_page_cache_readahead+0x0/0x27c) from [<c0068894>]
(do_page_c)
[<c006882c>] (do_page_cache_readahead+0x0/0x7c) from [<c00606ac>]
(filemap_faul)
 r7:c38d51b8 r6:c039ce20 r5:00000000 r4:c38d6380
[<c0060380>] (filemap_fault+0x0/0x3d4) from [<c0071f4c>]
(__do_fault+0x58/0x3d4)
[<c0071ef4>] (__do_fault+0x0/0x3d4) from [<c00745f8>]
(handle_mm_fault+0xf8/0xa)
[<c0074500>] (handle_mm_fault+0x0/0xa8c) from [<c002b734>]
(do_page_fault+0x1a0)
[<c002b594>] (do_page_fault+0x0/0x268) from [<c002b8fc>]
(do_translation_fault+)
[<c002b888>] (do_translation_fault+0x0/0x7c) from [<c00241e4>]
(do_DataAbort+0x)
 r6:c381ddf0 r5:4000d008 r4:00000805 r3:00000005
[<c00241b0>] (do_DataAbort+0x0/0x9c) from [<c00249c0>]
(__dabt_svc+0x40/0x60)
Exception stack(0xc381ddf0 to 0xc381de38)
dde0:                                     4000d008 00000ff0 00000000
8100dfff
de00: c38d6300 c39ca000 00000000 c381df50 c381c000 c38d6380 40000000
c381de4c
de20: 00000000 c381de38 c00b81f8 c0132f10 20000013
ffffffff
 r8:c381c000 r7:c381df50 r6:00000000 r5:c381de24 r4:ffffffff
[<c00b81a4>] (padzero+0x0/0x60) from [<c00b90d0>]
(load_elf_binary+0xb0c/0x11e8)
[<c00b85c4>] (load_elf_binary+0x0/0x11e8) from [<c00890d8>]
(search_binary_hand)
[<c0089024>] (search_binary_handler+0x0/0x250) from [<c008a220>]
(do_execve+0x2)
[<c008a00c>] (do_execve+0x0/0x290) from [<c0028260>]
(kernel_execve+0x40/0x8c)
[<c0028220>] (kernel_execve+0x0/0x8c) from [<c0024284>]
(run_init_process+0x1c/)
 r7:00000000 r6:00000000 r5:c001d36c r4:c03b7d20
[<c0024268>] (run_init_process+0x0/0x24) from [<c0024314>]
(init_post+0x88/0x10)
[<c002428c>] (init_post+0x0/0x10c) from [<c00089c8>] (kernel_init+0xc0/0xe8)
 r4:c03b7d20 r3:c3401080
[<c0008908>] (kernel_init+0x0/0xe8) from [<c0039dc8>] (do_exit+0x0/0x638)
 r5:00000000 r4:00000000
Code: 0a000008 e5942000 e2877001 e1570005 (e5823004)
---[ end trace 219da93bf697758d ]---
Kernel panic - not syncing: Attempted to kill init!
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