Device Tree setup for 8272-based board

[mingqian]

Hi Daniel,
    I think you'd better read Documentation/powerpc/bootwrapper.txt, and choose the appropriate image target.

--------------------------------------------------
From: "Daniel Ng" <daniel_ng11 at lycos.com>
Sent: Friday, December 19, 2008 2:31 PM
To: <linuxppc-embedded at ozlabs.org>
Subject: Device Tree setup for 8272-based board

> Hi,
> 
> We are migrating our PowerPC 8272-based board from 2.6.14 to 2.6.27.
> 
> One of the big changes is the need for a Device Tree for bootup.
> 
> So far, my bootup looks like the below (using u-boot).
> 
> I am just using arch/powerpc/boot/cuboot-824x.c 
> and /arch/powerpc/boot/dts/mpc8272ads.dts for now. Therefore, all the settings 
> as printed below are wrong ie. Memory, ENET0 mac, CPU clock freq, etc.
> 
> When I change the settings in mpc8272ads.dts and do a fresh recompile, the 
> settings do not change. However, if I use another cuboot*.c file, I get a 
> different set of printed settings eg. 2 ethernet ports instead of 1. This is 
> fine, but I don't see where in the cuboot*.c file these settings are 
> specified. Can someone suggest where these might be?
> 
> Cheers,
> Daniel
> 
> 
> ## Booting image at 00200000 ...
>   Image Name:   Linux-2.6.27-mybuild
>   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
>   Data Size:    1477233 Bytes =  1.4 MB
>   Load Address: 00400000
>   Entry Point:  00400594
>   Verifying Checksum ... OK
>   Uncompressing Kernel Image ... OK
> Memory <- <0x0 0x4000000> (64MB)
> ENET0: local-mac-address <- c0:a8:01:4b:7e:13
> CPU clock-frequency <- 0xa175c100 (2709MHz)
> CPU timebase-frequency <- 0x4ead9a0 (83MHz)
> CPU bus-frequency <- 0x13ab6680 (330MHz)
> 
> zImage starting: loaded at 0x00400000 (sp: 0x03f7c9c8)
> Allocating 0x316e8c bytes for kernel ...
> gunzipping (0x00000000 <- 0x0040c000:0x0071367c)...done 0x2f41a0 bytes
> 
> Linux/PowerPC load:
> Finalizing device tree... flat tree at 0x40acd8
> 
> (there is no more output after this)
> 
> 
> 
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