Re: [linuxsh-dev] How to pass the control from SH IPL+g to compressed kernel for SH7727

[Stuart M. <stu...@st...>]

On Tue, 2 Jul 2002 09:22:52 +0100
mks...@ya... wrote:

> Dear all,
> 
> I have downloaded the SH IPL+g  and the kernel to the
> Flash ROM of my Hitachi SH3 7727F processor based
> board having 2MB SDRAM and 4MB Flash ROM 
> I am getting responses in my Tera Term Pro serial port
> emulator.But i dont know how to pass control from sh
> ipl+g to the compressed kernel.
> 
> I have read the LinuxSH FAQ.But i have some specific
> doubts.
> 1) How to pass the control from SH IPL+g to the
> compressed kernel?
> I know that in sh ipl+g "1" and "2" commands can be
> used to jump 
> to predefined locations (CONFIG_BOOT_LOADER1,
> CONFIG_BOOT_LOADER2) .
> Is it okay that i put the compressed kernel in any of
> the above location?

Yes. That's what its designed for.

> 2) whether SH IPL+g will decompress the kernel and
> transfer to RAM?

No. The compressed kernel has its own decompression
loader at the beginning, which decompresses the code from
ROM into RAM. So when you tell sh-ipl to jump to the
'compressed kernel', you are actually jumping to the
decompression code (which is obviously not compressed!).

> 3) Where comes the role of file system? Do we need a
> file system for porting linux to a development board?

Yes. You need a root file system for the kernel to load the
application code from. This can be on any media though, NFS,
hard drive, or Flash.

> Could any please share some ideas in the matter,i will
> be very thankful

No problem

> Regards,
> Manoj K.S

Stuart