mkImage -e option for 4MB virtual entry point address of vmlinux

srinivas.surabhi at srinivas.surabhi at
Mon Feb 21 20:48:12 EST 2005

In the last lines of the build which contains the below

ppc_82xx-ld -T ../ld.script -Ttext 0x00400000 -Bstatic -o zvmlinux

means that the entry address is 0x400000 ( 4MB) . Does it mean that the
while making mkImage for the kernel the -e option should be given
0x400000? And the load address option should also be the same for linux
kernel image or Is it ok if the load address is 0x0 address?

Thanks & Regards
Surabhi Srinivas

-----Original Message-----
From: linuxppc-embedded-bounces at
[mailto:linuxppc-embedded-bounces at] On Behalf Of David Jander
Sent: Monday, February 21, 2005 1:08 PM
To: linuxppc-embedded at
Subject: Re: Freeing unused kernel memory: 56k init

On Sunday 20 February 2005 16:25, srinivas.surabhi at wrote:
> When I tried to debug for the reason of  "Freeing unused kernel
> 56k init " hang problem  the following is the printk outputs...
> Entering kernel_read
> Entering elf_map
> map_addr was 0x30026000

Heh? Weired address. I'd expect something above 0xc0000000

> Failed due to bad address

No wonder....

> >From the above can anything be concluded ?
> One more doubt was, is it mandatory that the Virtual memory has to
> enabled while building the Mounta Vista linux kernel ? Why because
> was an option to enable the kernel base address and if it is enabled
> asks for what is the address for the Kernel Virtual base address? If I
> give 0x0 it works otherwise the Kernel itself is not at all booting.

Ok, don't say no more! Do not ever change that address unless you know
what you are doing. It should be 0xc0000000 usually.
If the kernel doesn't boot, something else is wrong.
The linux kernel uses virtual memory, that's why it needs an MMU for
That way, the memory the kernel uses and runs in is always mapped at

> Till the statement "Freeing unused kernel memory: 56k init"  is coming
> only if and if the 0x0 was given for the kernel virtual base address.

That's actually pretty funny. I'd never thought about doing such an
and expecting it to do something :-)


David Jander
Protonic Holland.
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