Re: Booting ELF image using redboot

[Subodh Nijsure <nijsure.subodh@gmail.com>]

Hello Weqaar,

I am still not able to load the ELF image on my board that run
redboot. I am trying to load image that is combined bzImage + ramdisk
produced by wraplinux script.
(http://www.kernel.org/pub/linux/utils/boot/wraplinux/)

I have included output of readelf -h and 50 lines of system.map

readelf -h vmlinux.initrd.wrap
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 ff 00 00 00 00 00 00 00 00
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            Standalone App
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x12a18
  Start of program headers:          52 (bytes into file)
  Start of section headers:          5309992 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         3
  Size of section headers:           40 (bytes)
  Number of section headers:         8
  Section header string table index: 7



00000400 A __kernel_vsyscall
00000410 A SYSENTER_RETURN
00000420 A __kernel_sigreturn
00000440 A __kernel_rt_sigreturn
00100000 A phys_startup_32
c0100000 T _text
c0100000 T startup_32
c01000b0 T _stext
c01000b0 t run_init_process
c01000b0 T stext
c01000c4 t init_post
c01001b0 t try_name
c010037b T name_to_dev_t
c01005f0 T calibrate_delay
c01008a0 T thread_saved_pc
c01008aa T disable_hlt
c01008b2 T enable_hlt
c01008ba t poll_idle
c01008bd T dump_task_regs
c01009a8 T select_idle_routine
c01009e3 T arch_align_stack
c0100a18 T mwait_idle_with_hints
c0100a52 t mwait_idle
c0100a5c T sys_vfork
c0100a8c T sys_clone
c0100ac7 T sys_fork
c0100af7 T release_thread
c0100b0a T kernel_thread
c0100b9c T cpu_idle
c0100c05 T dump_thread
c0100d22 T sys_execve
c0100da2 T get_wchan
c0100e22 T sys_set_thread_area
c0100fb6 T sys_get_thread_area
c01010de T show_regs
c01012a1 T default_idle
c01012da T copy_thread
c01014b3 t __switch_to_xtra
c0101518 T __switch_to
c0101640 T cpu_idle_wait
c01016b2 T exit_thread
c010175f T flush_thread
c01017d8 T prepare_to_copy
c0101840 t setup_sigcontext
c01019c9 T sys_sigaltstack
c01019db t restore_sigcontext
c0101bb5 T sys_sigaction
c0101c8a T sys_rt_sigreturn
c0101d62 T do_notify_resume
c0102428 T sys_sigsuspend


On Sun, Jul 26, 2009 at 9:33 AM, Weqaar Janjua<weqaar@yahoo.com> wrote:
> Please post the first 50 lines of System.map and output from 'readelf -h vmlinux'
>
> - Weqaar A. Janjua
>
>
>
> ----- Original Message ----
> From: Subodh Nijsure <nijsure.subodh@gmail.com>
> To: Gary Thomas <gary@mlbassoc.com>
> Cc: ecos-devel@sourceware.org
> Sent: Friday, July 24, 2009 5:30:34 PM
> Subject: Re: Booting ELF image using redboot
>
> See my attempts below (still no joy, I am stumped appreciate help!)
>
> On Fri, Jul 24, 2009 at 8:15 AM, Gary Thomas<gary@mlbassoc.com> wrote:
>> Subodh Nijsure wrote:
>>> I am new to using redboot and I need some help.
>>>
>>> This is x86 platform.
>>>
>>> On this platform I can boot the bzImage but not the ELF format linux image.
>>>
>>> Example if I have following boot script my board boots fine.
>>>
>>> load -v -r -m disk -b 0x200000 hda2:bzImage
>>> exec -b 0x200000 -l 0x300000 -c "console=ttyS0,115200 ip=dhcp
>>> root=/dev/nfs  (some env specific stuff) "
>>>
>>> However I can not get redboot to load the ELF image I see message (
>>> Bootsector magic not found (0x8954 @ 0x002001fe)
>>>
>>> (Not this  vmlinux  was produced by build process that created bzImage
>>> that works)
>>>
>>> load -v -r -m disk -b 0x200000 hda2:vmlinux
>>> exec -b 0x200000 -l 0x300000 -c "console=ttyS0,115200 ip=dhcp
>>> root=/dev/nfs  (some env specific stuff) "
>>> Bootsector magic not found (0x8954 @ 0x002001fe)
>>>
>>> Reason I am trying to boot ELF image is I am trying to use wraplinux
>>> utility to wrap kernel and initrd, wraplinux produce
>>>
>>> Would appreciate any pointers as to what parameters I need to fix for
>>> load/exec when loading ELF file.
>>
>> Try leaving out the '-r' and '-b' options - ELF loading
>> should not need them.
>
> So I tried doing the following
>
> load -v -m disk hda2:vmlinux
> exec -c "console=ttyS0,115200 root=/dev/sda2 ip=dhcp platformid=0x500300"
>
> I also tried to execute exec with that specified -l
>
> load -v -m disk hda2:vmlinux
> exec -l 0x500000 -c "console=ttyS0,115200 root=/dev/sda2 ip=dhcp
> platformid=0x500300"
>
> without any luck objdump for vmlinux shows the following: so I have
> also tried executing
> go 0x00100000 without any luck
>
>
> vmlinux:     file format elf32-i386
> vmlinux
> architecture: i386, flags 0x00000112:
> EXEC_P, HAS_SYMS, D_PAGED
> start address 0x00100000
>
> Program Header:
>    LOAD off    0x00001000 vaddr 0xc0100000 paddr 0x00100000 align 2**12
>         filesz 0x0036032c memsz 0x0036032c flags r-x
>    LOAD off    0x00362000 vaddr 0xc0461000 paddr 0x00461000 align 2**12
>         filesz 0x0007a086 memsz 0x000bc000 flags rwx
>    NOTE off    0x002b4cd8 vaddr 0xc03b3cd8 paddr 0x003b3cd8 align 2**2
>         filesz 0x00000024 memsz 0x00000024 flags ---
>
>
>
>
> /Subodh
>
>
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