[U-Boot-Users] Re: What does the Kernel get from U-boot ?

[U-Boot-Users] Re: What does the Kernel get from U-boot ?

[Federico Lucifredi]

Hello Booters,
    Just a quick newbie-style question: what is passed between U-boot 
and the kernel? Just the bootargs env variable or is there any other 
(more intimate :-) relationship between the two? What I am asking is, 
what does the kernel get from U-boot aside from the location of the root 
filesystem? I guess the answer is 'nothing', but if it turns out there 
is more, I'd like to know =)

    -Federico

 
_________________________________________
-- "'Problem' is a bleak word for challenge" - Richard Fish

Muad'Dib of Caladan (Federico L. Lucifredi)- Harvard University & BU
http://metcs.bu.edu/~lucifred

[U-Boot-Users] Re: What does the Kernel get from U-boot ?

[craig vanderborgh]

Federico Lucifredi <flucifredi <at> acm.org> writes:

> 
> Hello Booters,
>     Just a quick newbie-style question: what is passed between U-boot 
> and the kernel? Just the bootargs env variable or is there any other 
> (more intimate http://news.gmane.org/img/smilies/smile.png"> relationship
between the two? What I am asking is, 
> what does the kernel get from U-boot aside from the location of the root 
> filesystem? I guess the answer is 'nothing', but if it turns out there 
> is more, I'd like to know =)
> 
>     -Federico
> 
> _________________________________________


Hello Federico,

I think I can answer your question, but I need a bit more information first.

What U-boot passes to the linux kernel is architecture-dependent, as so many
things are in this world.  What kind of system are you working with?

[U-Boot-Users] Re: What does the Kernel get from U-boot ?

[George G. Davis]

On Tue, Dec 21, 2004 at 08:06:32PM -0500, Federico Lucifredi wrote:
> Hello Booters,
>    Just a quick newbie-style question: what is passed between U-boot 
> and the kernel? Just the bootargs env variable or is there any other 
> (more intimate :-) relationship between the two? What I am asking is, 
> what does the kernel get from U-boot aside from the location of the root 
> filesystem? I guess the answer is 'nothing', but if it turns out there 
> is more, I'd like to know =)

If it gets nothing more than the cmdline, that alone is a lot since it
allows flexibility of booting the kernel in a variety of different ways,
e.g. what to exec as init; MTD flash, NFS; ramdisk based root among others;
what to use as console device; changing MTD flash partition layouts;
memory size; etc.,. Other parameters passed into the Linux kernel from
U-Boot vary by architecture and board. For that, see the README, source
and, perhaps, http://www.denx.de/twiki/bin/view/DULG/WebHome.

--
Regards,
George

> 
>    -Federico
> 
> 
> _________________________________________
> -- "'Problem' is a bleak word for challenge" - Richard Fish
> 
> Muad'Dib of Caladan (Federico L. Lucifredi)- Harvard University & BU
> http://metcs.bu.edu/~lucifred
> 
> 
> 
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