Problems porting to a custom PPC405GPr board using a vanilla 2.6.10 kernel

Hi

I would like to port Linux to a custom PPC405GPr board. Its hardware runs=20
vxWorks fine for more than a year.=20

Within a few days I had a working U-boot image, which allows me to download=
=20
via TFTP Linux-kernels.

I started with a vanilla 2.6.10 kernel, added the entries in the=20
arch/ppc/platforms/4xx/Makefile and Kconfig, two file hcu3.c and hcu3.h whi=
ch=20
are very minimal. The board has no PCI and I do not want to add support for=
=20
the CFI-Flashs or the onboard CAN-Chips.=20
Enabling the SERIAL_TEXT_DEBUG I got the following output
## Transferring control to Linux (at address 00000000) ...
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:setio
hcu3_map_io
MMU:exit
setup_arch: enter ngng
setup_arch: bootmem
ocp: exit
arch: exit
If I attach a BDI, I get a lot of "- TARGET: target has entered debug mode"=
=20
lines and then
DI>i
    Target state      : debug mode
    Debug entry cause : unconditional debug event
    Current PC        : 0xfffffffc
    Current CR        : 0x00000000
    Current MSR       : 0x00000000
    Current LR        : 0xc019a15c
BDI>               =20
The corresponding line from my System.map are
c0199e20 t free_bootmem_core
c0199ecc t __alloc_bootmem_core
c019a278 t free_all_bootmem_core
c019a4c8 T init_bootmem_node

My board has no RTC. Is this a problem?=20

Should I start with another kernel? Can anybody point me to a known good=20
kernel version for a specific PPC405 board?

Any hint would be greatly appreciated.

Best regards

=2D-=20
Niklaus Giger
Wieshoschet 6
CH-8753 Mollis
Tel. ++41 55 612 20 54 (privat)
Tel. ++41 55 618 64 68 (Gesch=E4ft)

Am Samstag, 26. Februar 2005 23.28 schrieb Niklaus Giger:

Hi

I would like to port Linux to a custom PPC405GPr board. Its hardware runs
vxWorks fine for more than a year.

I made some more progress. After adding 3 lines for MMU support with the BDI
I can debug the startup up to kernel_start using BDI.=20

Afterwards my console changes the baudrate for still unknown reasons.

Analysing the __log_buf I get the following output
(gdb) x/s &__log_buf
0xc01accfc <ratelimit_lock.9>:   "<4>Linux version 2.6.10=20
(niklaus@ng.ngiger.dyndns.org) (gcc-Version 3.3.5 (Debian 1:3.3.5-8)) #15 S=
un=20
=46eb 27 14:44:27 CET 2005\n<7>On node 0 totalpages: 8240\n<7>  DMA zone: 8=
240=20
pages, LIFO batch:2\n<7>"...
(gdb) x
0xc01acdc4 <ratelimit_lock.9+200>:       "  Normal zone: 0 pages, LIFO=20
batch:1\n<7>  HighMem zone: 0 pages, LIFO batch:1\n<4>Built 1=20
zonelists\n<4>Kernel command line: ip=3D172.25.1.6\n<4>PID hash table entri=
es:=20
256 (order:8, 4096 bytes)\n"
(gdb) x
0xc01ace84 <ratelimit_lock.9+392>:       ""

My board has no RTC. Is this a problem?=20

Should I start with another kernel? Can anybody point me to a known good=20
kernel version for a specific PPC405 board?

Any hint would be greatly appreciated.

Best regards

=2D-=20
Niklaus Giger
Wieshoschet 6
CH-8753 Mollis
Tel. ++41 55 612 20 54 (privat)
Tel. ++41 55 618 64 68 (Gesch=E4ft)