Problem bringing up Linux on Custom MPC852 Board

Problem bringing up Linux on Custom MPC852 Board

[Chris Down]

Oops typo in the original subject line :-)

I am trying to bring up Linux (latest linuxppc-2.4 tree) on a custom =
MPC852
Board. The board has 8MByte SDRAM and 8MByte Flash.=20
I have ported u-boot, modified Linux to add a new board config and added =
the
board specific definitions in arch/ppc/platforms.=20
U-Boot and Linux were built using the ppc_8xx compiler from ELDK 3.0.

When I boot Linux I get the following:-

## Booting image at 00100000 ...
   Image Name:   Linux-2.4.28-pre3-cdd1
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    664920 Bytes =3D 649.3 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
Linux version 2.4.28-pre3-cdd1 (chris@alioth) (gcc version 3.2.2 =
20030217 (Yello
w Dog Linux 3.0 3.2.2-2a_1)) #3 Fri Nov 12 09:46:59 GMT 2004 On node 0
totalpages: 2048
zone(0): 2048 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line:
Decrementer Frequency =3D 187500000/60
Calibrating delay loop... 49.76 BogoMIPS
Memory: 6508k available (1176k kernel code, 344k data, 56k init, 0k =
highmem)=20
Dentry cache hash table entries: 1024 (order: 1, 8192 bytes)=20
Inode cache hash table entries: 512 (order: 0, 4096 bytes)=20
Mount cache hash table entries: 512 (order: 0, 4096 bytes)=20
Buffer cache hash table entries: 1024 (order: 0, 4096 bytes)=20
Page-cache hash table entries: 2048 (order: 1, 8192 bytes) POSIX =
conformance
testing by UNIFIX

At this point it stops executing in arch_kernel_thread.

As I am new to this I could do with some pointers as to what to do next. =
Any
help would be gratefully appreciated.


Regards

Chris Down

Re: Problem bringing up Linux on Custom MPC852 Board

[Wolfgang Denk]

In message <000d01c4c977$8951b0e0$0101a8c0@alcor1> you wrote:
> 
> I have ported u-boot, modified Linux to add a new board config and added the
> board specific definitions in arch/ppc/platforms. 
...
> When I boot Linux I get the following:-
...
> At this point it stops executing in arch_kernel_thread.

I bet some beer that this is actually a FAQ - see
http://www.denx.de/twiki/bin/view/DULG/LinuxCrashesRandomly

This phenomenon is typical for a novice's port of U-Boot.

Best regards,

Wolfgang Denk

-- 
See us @ Embedded/Electronica Munich, Nov 09 - 12, Hall A.6 Booth 513
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
"There are things that are so serious that you can  only  joke  about
them"                                                    - Heisenberg

RE: Problem bringing up Linux on Custom MPC852 Board

[Chris Down]

> ...
> > At this point it stops executing in arch_kernel_thread.
> 
> I bet some beer that this is actually a FAQ - see 
> http://www.denx.de/twiki/bin/view/DULG/LinuxCrashesRandomly
> 
> This phenomenon is typical for a novice's port of U-Boot.
> 

Wolfgang, thanks for your reply. I will re-check the SDRAM initialisation and
UPM programming.

Regards

Chris Down

RE: Problem bringing up Linux on Custom MPC852 Board

[Chris Down]

.
> > > At this point it stops executing in arch_kernel_thread.
> >=20
> > I bet some beer that this is actually a FAQ - see
> > http://www.denx.de/twiki/bin/view/DULG/LinuxCrashesRandomly
> >=20
> > This phenomenon is typical for a novice's port of U-Boot.
> >=20
>=20
> Wolfgang, thanks for your reply. I will re-check the SDRAM=20
> initialisation and UPM programming.
>=20

Wolfgang,
The solution was a lot simpler, there was no problem with the SDRAM
initialisation. The cause was due to the fact that I had a BDI2000 =
connected and
the SYSIE bit was enabled in the DER for flash programming. Clearing =
this bit
solved the problem, probably a typical novice error :-)

Regards

Chris Down

Re: Problem bringing up Linux on Custom MPC852 Board

[Wolfgang Denk]

In message <000001c4ce35$6194b260$0101a8c0@alcor1> you wrote:
>
> The solution was a lot simpler, there was no problem with the SDRAM
> initialisation. The cause was due to the fact that I had a BDI2000
> connected and
> the SYSIE bit was enabled in the DER for flash programming. Clearing

There is no need to set SYSIE.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
We want to create puppets that pull their own strings.   - Ann Marion