RE: linux boot sequence

Rami,

Please make sure to copy the list as well.

OF - Open firmware. I am not sure which version of Linux kernel you are =
using, and which boot loader. Lately it is all OF based, however it is =
supported in the form of device tree blob/structure. For more =
information read booting-without-of.txt in Documentation/powerpc.

U-Boot updates the detected memory in the dtb you loaded, so that when =
kernel reads it, correct information is provided.

There is no auto-detect option in kernel. You need to write your own =
code at the exact location it needs to identify the size of memory. =
Typically this is passed to the kernel either through DTB or kernel =
arguments.

Good Luck.

- Siva




-----Original Message-----
From: Rami WEHBI [mailto:rwehbi@wirecom-tech.com]=20
Sent: Monday, July 14, 2008 11:47 PM
To: Siva Prasad
Subject: RE: linux boot sequence


 what is the OF dtb ??? And how does the bootloader update it ???

 How can I do to set the autodetect option in the kernel ???


Best Regards,
Rami,



-----Message d'origine-----
De : Siva Prasad [mailto:sprasad@bivio.net]=20
Envoy=E9 : vendredi 11 juillet 2008 23:01
=C0 : Rami WEHBI
Cc : linuxppc-embedded@ozlabs.org
Objet : linux boot sequence


Well!... You can pass the size as part of the OF memory=3D<>.

Typically your boot loader should detect the amount of memory on the =
system and update the OF dtb to reflect the available memory.

You may also tweak the kernel yourself to autodetect, instead of reading =
from the OF. How ever, I would recommend the previous approach.

- Siva


Date: Fri, 11 Jul 2008 08:34:54 +0200
From: "Rami WEHBI" <redacted>
Subject: linux boot sequence
To: <redacted>
Message-ID:
=09
[ref]
Content-Type: text/plain; charset=3D"iso-8859-1"


Hi all,
=20
    I am using the ppc405 and I would like to know, how does linux on =
this architect detect the available memory size in details !!!
        is it a parameter passed to linux at startup by the boot loader =
??
        is it an automatic detection ?? what are the steps to accomplish =
this job then ???
=20
Best regards to all,
=20
Rami
=20



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