Hi,
I'm doing kernel porting to arm926 based FPGA board,very minimal setup
(uart + timer only)
I'm getting kernel panic after cramfs root file system is mounted,I am
expecting to enter login prompt after root file system is mounted.
Below are the details
#define PLAT_PHYS_OFFSET 0x80000000 (with 128 MB SDRAM)
#define CONFIG_PAGE_OFFSET 0xc0000000
Physical memory : 128MB (0x80000000 to 88000000)
ZRELADDR = 0x80008000
PARAMS_PHYS = 0x80000100
INITRD_PHYS = 0x80800000
Kernel cmd line : mem=32M console=ttySAC0,115200 root=/dev/ram0
rootfstype=cramfs init=/linuxrc initrd=0x80800000,8M user_debug=31
executables in cramfs (/bin) are built with busy box with all libraries
statically linked.
*linuxrc init script*
#!/bin/sh**
/bin/echo "mount /etc as ramfs"
/bin/mount -n -t ramfs ramfs /etc
/bin/mount -n -t tmpfs tmpfs /tmp
exec /sbin/init
I tried with this init script,but kernel is hanging without any message..
I changed it a bit as below, to see if it reads the init script
#!/bin/sh
/bin/echo "Entering Init script"
with this changes,I am expect to get print message "Entering Init script"
after cramfs is mounted,but I am getting panic message which is attached
below.
Can some one suggest how to fix this..
*Kernel message:*
*memory layout:*
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc2800000 - 0xf6000000 ( 824 MB)
lowmem : 0xc0000000 - 0xc2000000 ( 32 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.text : 0xc0008000 - 0xc0169000 (1412 kB)
.init : 0xc0169000 - 0xc017d000 ( 80 kB)
.data : 0xc017e000 - 0xc018b720 ( 54 kB)
.bss : 0xc018b744 - 0xc019c6fc ( 68 kB)
RAMDISK: cramfs filesystem found at block 0
RAMDISK: Loading 5868KiB [1 disk] into ram disk... -
done.
VFS: Mounted root (cramfs filesystem) readonly on device 1:0.
Freeing init memory: 80K
*Panic message:*
Kernel panic - not syncing: Attempted to kill init!
Backtrace:
[<c000c378>] (dump_backtrace+0x0/0x10c) from [<c000c49c>]
(dump_stack+0x18/0x1c)
r6:c1822000 r5:c018bb40 r4:c018bb60 r3:60000013
[<c000c484>] (dump_stack+0x0/0x1c) from [<c0017d3c>] (panic+0x64/0x1b0)
[<c0017cd8>] (panic+0x0/0x1b0) from [<c001b5d8>] (do_exit+0x2b8/0x6b4)
r3:c0184294 r2:00000000 r1:00000001 r0:c014f394
r7:c1822000
[<c001b320>] (do_exit+0x0/0x6b4) from [<c001bd3c>] (do_group_exit+0xd8/0xe0)
r7:000000f8
[<c001bc64>] (do_group_exit+0x0/0xe0) from [<c001bd5c>]
(sys_exit_group+0x18/0x20)
r4:0008eba4 r3:00000000
[<c001bd44>] (sys_exit_group+0x0/0x20) from [<c0009460>]
(ret_fast_syscall+0x0/0x2c)
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On 2012-04-11 19:03:42 (+0530), pcuser p [off-list ref] wrote:
I'm getting kernel panic after cramfs root file system is mounted,I am
expecting to enter login prompt after root file system is mounted.
Kernel cmd line : mem=32M console=ttySAC0,115200 root=/dev/ram0
rootfstype=cramfs init=/linuxrc initrd=0x80800000,8M user_debug=31
*linuxrc init script*
#!/bin/sh**
/bin/echo "mount /etc as ramfs"
/bin/mount -n -t ramfs ramfs /etc
/bin/mount -n -t tmpfs tmpfs /tmp
exec /sbin/init
I tried with this init script,but kernel is hanging without any message..
I changed it a bit as below, to see if it reads the init script
#!/bin/sh
/bin/echo "Entering Init script"
Init isn't allowed to exit.
That's probably why you're seeing the panic. Try starting a shell after
the /bin/echo, or just using /bin/sh as init.
with this changes,I am expect to get print message "Entering Init script"
after cramfs is mounted,but I am getting panic message which is attached
below.
Probably because the system panics before the stdout buffers make it to
the console.
Regards,
Kristof
I am trying to create a root file systems using busybox for ARM926EJ-s
based board.
I'm using linaro tool chain 4.6.1(arm-linux-gnueabi-) in ubuntu 10.04
First step,I started with
make defconfig
CFLAGS=-march=armv5te make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
menuconfig
enabled only static binary option
CFLAGS=-march=armv5te make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
CONFIG_PREFIX=$ROOTFS install
when I do readelf on the busybox binary,I'm getting below messages
File Attributes
Tag_CPU_name: "7-A"
Tag_CPU_arch: v7
Tag_CPU_arch_profile: Application
Tag_ARM_ISA_use: Yes
Tag_THUMB_ISA_use: Thumb-2
Tag_FP_arch: VFPv3-D16
Tag_ABI_PCS_wchar_t: 4
Tag_ABI_FP_denormal: Needed
Tag_ABI_FP_exceptions: Needed
Tag_ABI_FP_number_model: IEEE 754
Tag_ABI_align_needed: 8-byte
Tag_ABI_align_preserved: 8-byte, except leaf SP
Tag_ABI_enum_size: int
Tag_ABI_HardFP_use: SP and DP
Tag_DIV_use: Not allowed
If i use this binary in for root file system,with init=/linuxrc
I'm getting undefined instruction error and kernel panics
init (1): undefined instruction: pc=40047930
Code: 0000aa80 00000714 e3e00000 e1a0f00e (eca0420c)
Kernel panic - not syncing: Attempted to kill init!
I see that the busybox is compiled for different arm architecture, other
than the one i specified (armv5te)
To identify the issue is with busybox or toolchain or configuration,I tried
with hello program (hello world) as init (init =/sbin/hello).
arm-linux-gnueabi-gcc -march=armv5te -o hello hello.c
Failed to execute /sbin/hello. Attempting defaults...
init (1): undefined instruction: pc=0006f7b2
Code: 2001 2000 f85d fb08 (bf00) f84d
I'm trying to get past the root file system for last few days,for this
problem i can't clearly get any idea about what the cause is.
kindly help me in clearing this problem
On Wed, Apr 11, 2012 at 7:34 PM, Kristof Provost [off-list ref] wrote:
On 2012-04-11 19:03:42 (+0530), pcuser p [off-list ref] wrote:
quoted
I'm getting kernel panic after cramfs root file system is mounted,I am
expecting to enter login prompt after root file system is mounted.
Kernel cmd line : mem=32M console=ttySAC0,115200 root=/dev/ram0
rootfstype=cramfs init=/linuxrc initrd=0x80800000,8M user_debug=31
*linuxrc init script*
#!/bin/sh**
/bin/echo "mount /etc as ramfs"
/bin/mount -n -t ramfs ramfs /etc
/bin/mount -n -t tmpfs tmpfs /tmp
exec /sbin/init
I tried with this init script,but kernel is hanging without any
message..
quoted
I changed it a bit as below, to see if it reads the init script
#!/bin/sh
/bin/echo "Entering Init script"
Init isn't allowed to exit.
That's probably why you're seeing the panic. Try starting a shell after
the /bin/echo, or just using /bin/sh as init.
quoted
with this changes,I am expect to get print message "Entering Init script"
after cramfs is mounted,but I am getting panic message which is attached
below.
Probably because the system panics before the stdout buffers make it to
the console.
Regards,
Kristof
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