[ELDK] ELDK Linux 2.6.29, MPC885ADS and early console

[Wolfgang Denk]

Dear Sylvain ANDRE,

please do not top post;

please do not full quote;

please do not post HTML - post plain text only.

Please read http://www.netmeister.org/news/learn2quote.html

In message <49E6E298.7040404 at assystem.com> you wrote:
>
>     * *Maybe you forgot to power on?*
> 
> ok I tought Linux ELDK was a community not a way to laugh about people ?

I don't laugh about you. I gave you one possible explanation for the
effect you described - one that was as likely as any other one given
the fact that you did not provide any useful information.

You might want to read http://catb.org/esr/faqs/smart-questions.html

>     * *Sorry, but you did not give any details, like which exact
>       software versions (U-Boot and Linux, whiche xact git commit ID)
>       you are using,*
> 
> I already put some information but here they are again :
>     - U-Boot 1.3.4
>     - Linux 2.6.29 rc7 fec6c6fec3e20637bee5d276fb61dd8b49a3f9cc

You did not mention this before.

> To configure the kernel :
>     make ARCH=powerpc xconfig

You enable a lot of stuff in your config that is either not necessary
or even dangerous. For example, to get a system running I would not
play wiuth things like CONFIG_ADVANCED_OPTIONS, CONFIG_PIN_TLB and
things like that.

I recommend you start with a known to be working configuration, i.e.
please run:

	make ARCH=powerpc mrproper
	make ARCH=powerpc mpc885_ads_defconfig

> To compile :
>     PATH=$PATH:/opt/eldk/usr/bin:/opt/eldk/bin
>     export CROSS_COMPILE=ppc_8xx-
>     make ARCH=powerpc uImage

OK.

>       ****how you build the device tree blob****
> 
> Compile FDT  (see below pls) with DTC v1.2.0:
>     ./dtc -b 0 -V17 -p 0x1000 -I dts -O dtb ./mpc885ads.dts > 
> /tftpboot/mpc885.dtb

Your device tree contains a number of differences compared to what is
in the current kernel tree:

--- arch/powerpc/boot/dts/mpc885ads.dts	2009-04-11 22:45:36.657750803 +0200
+++ /tmp/mpc885.dts	2009-04-16 12:26:22.742552047 +0200
@@ -29,9 +29,9 @@
 			i-cache-line-size = <16>;
 			d-cache-size = <8192>;
 			i-cache-size = <8192>;
-			timebase-frequency = <0>;
-			bus-frequency = <0>;
-			clock-frequency = <0>;
+            timebase-frequency = <80000000>;
+            bus-frequency = <40000000>;
+            clock-frequency = <80000000>;
 			interrupts = <15 2>;	// decrementer interrupt
 			interrupt-parent = <&PIC>;
 		};
@@ -39,7 +39,7 @@
 
 	memory {
 		device_type = "memory";
-		reg = <0x0 0x0>;
+        reg = <0x00000000 0x2800000>;
 	};
 
 	localbus at ff000100 {
@@ -75,7 +75,8 @@
 		ranges = <0x0 0xff000000 0x4000>;
 		bus-frequency = <0>;
 
-		// Temporary -- will go away once kernel uses ranges for get_immrbase().
+        // Temporary -- will go away once kernel uses ranges for 
+get_immrbase().
 		reg = <0xff000000 0x4000>;
 
 		mdio at e00 {


I recommend to use the device tree as included with the Linux kernel
tree. To compile it, it is sufficient to run:

	make ARCH=powerpc mpc885ads.dtb

> bootargs=root=/dev/rd/0 console=ttyCPM0 init=/linuxrc rw mem=40M

For testing I recommend not to interfere with the default settings,
i. e. omit the "mem=" argument.

>     * ********which root file system you are using, etc. etc. ********
> 
> I tried to boot with a ramdisk and busybox but the result is the same.********

Busybox is not a root file system, so your statement makes actually
little sense.

Are you sure you have the needed device nodes included in your root
file system? 


Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Don't you know anything? I should have thought anyone knows that  who
knows anything about anything...      - Terry Pratchett, _Soul Music_