答复: How to load a linux kernel under vxworks bootloader (PPC860board)

[Esben Nielsen]

On Thu, 28 Jul 2005, FCG WANG Baohua wrote:

> Dear Esben:
>  Thanks for your advice. I guess the vxworks 5.3.1 can process the ELF format. 
>  Can you tell me "the link address of the VxWorks kernel ELF file" ? 
>  Someone said that  "make sure the Linux kernel is linked at that same address".
>  Other one said to use zImage of kernel instead of ELF "vmlinux" image, have you tested using zImage on vxWorks? 
>
I used the compressed elf image. I lost my HD since so I can't find it
now, but I think it was called arch/ppc/boot/zImage.elf or something like
that. It is around 1+-0.4 Mb big. Use the file command to check wether it
is elf or not.

  
>   Can you give me some step  tips when processing your 5.5 bootloader ?
Hmm, in the boot-prompt I just type the file-name of the linux kernel
instead of the vxWorks kernel. Not special issues. I guess I was lucky,
because I really don't know much about these issues!

Esben

>   need to revise the entry points? using the 0x200000 original addresss of linux kernel ? 
>   The serial port print what info after "starting at 0x200000 ...." ? 
>   
>   thanks a lot!
>   
> 
> -----ԭʼÓʼþ-----
> ·¢¼þÈË: Esben Nielsen [mailto:simlo at phys.au.dk]
> ·¢ËÍʱ¼ä: 2005Äê7ÔÂ28ÈÕ 15:47
> ÊÕ¼þÈË: Frank
> ³­ËÍ: FCG WANG Baohua; linuxppc-embedded at ozlabs.org
> Ö÷Ìâ: Re: How to load a linux kernel under vxworks bootloader
> (PPC860board)
> 
> 
> On Wed, 27 Jul 2005, Frank wrote:
> 
> > 
> > 
> > --- FCG WANG Baohua <Baohua.WANG at alcatel-sbell.com.cn> wrote:
> > 
> > > Dear All:
> > >   I want to boot a linux 2.4.25 kernel under vxworks
> > > bootloader. When I using flat mode(0x200000 -->  0x10000)
> > > kernel  uncompressed ELF format ( vmlinux ),
> > >  and download it using TFTP of vxworks, it print the "starting
> > > at 0x1000 ...." and  freeze.  No input or output on serial
> > > port.
> > >  The version of vxworks is 5.3.1. 
> > >  can you give me some detail advice or give me a tool to slove
> > > it? thanks !
> 
> I have done it on a MPC5200 with a vxWorks 5.5 bootsector with ethernet
> support: I just boot over FTP.  Give it the Linux kernel in elf-format, 
> the bootsector doesn't care, _what_ the code actually is, it just loads
> and run it. 
> 
> For vxWorks <= 5.4 I believe coff is used instead of elf - at least on
> some architectures. Then you have a problem, because the kernel isn't
> compiled to coff :-(
> 
> Esben
> 
> 
> > 
> > Do what I did:
> > Replace the vxWorks rom with you u-boot and you can boot Linux
> > or vxWorks with the same bootloader.
> > 
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> 
>