Re: Booting ELF image using redboot

Please post the first 50 lines of System.map and output from 'readelf -h vmlinux'

- Weqaar A. Janjua



----- Original Message ----
From: Subodh Nijsure <[email protected]>
To: Gary Thomas <[email protected]>
Cc: [email protected]
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<[email protected]> 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