Linux 2.6 on MPC5200. First port attempt ... Early problems ;(

Linux 2.6 on MPC5200. First port attempt ... Early problems ;(

[Sylvain Munaut]

Hello,

I'd like to run a 2.6 on a MPC5200 based board. Even if at first I'll
only use a 2.4 in production, I figured that the sooner I start to test
2.6, the sooner I'll be able to use it with enough stability. So I
started to tweak the 2.6.3 tree to make it boot on my LITE5200.

So, I've written/ported/copied some code for the console, the early
serial debug, ..., added the MPC to cputable.c and modified the
Kconfig/Makefile to build theses.
So far I don't seen anything on the serial console and  apparently, the
call the setup_common_caches ( in the cpu_setup_6xx.S ), never returns.
But the code is an exact copy of the 2.4 version ...

The method I use to trace where the execution goes or not is through the
leds connected to the GPIOs. From what I understood, the MBAR (
0xf0000000 ) is always mapped so I can trace with MMU on or off.

Anyone could give me a clue ?

Sylvain Munaut

PS: I'm not an expert in PPC arch. However, I've done such a port ( 2.4
-> 2.6 ) for an ARM architecture, so I'm not completly new to this
either ( even if ARM and PPC are little alike ... )

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Kernel startup assumptions/requirements

[Stuart Yoder]

I am new to Linux and am in the process of trying to get a kernel booted on
a PPC board.  What assumptions/requirements (if any) does the kernel have
about any system state/setup prior to the execution of the kernel entry
point?

Is it simply that the kernel is loaded and memory is accessible?   MMU
on/off?  Do any other peripherals (e.g 10ms timer) need to be initialized?

Thanks,
Stuart Yoder


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Linux 2.6 on MPC5200. First port attempt ... Early problems ;(

[Sylvain Munaut]

Hello,

I'd like to run a 2.6 on a MPC5200 based board. Even if at first I'll
only use a 2.4 in production, I figured that the sooner I start to test
2.6, the sooner I'll be able to use it with enough stability. So I
started to tweak the 2.6.3 tree to make it boot on my LITE5200.

So, I've written/ported/copied some code for the console, the early
serial debug, ..., added the MPC to cputable.c and modified the
Kconfig/Makefile to build theses.
So far I don't seen anything on the serial console and  apparently, the
call the setup_common_caches ( in the cpu_setup_6xx.S ), never returns.
But the code is an exact copy of the 2.4 version ...

The method I use to trace where the execution goes or not is through the
leds connected to the GPIOs. From what I understood, the MBAR (
0xf0000000 ) is always mapped so I can trace with MMU on or off.

Anyone could give me a clue ?


Sylvain Munaut


PS: I'm not an expert in PPC arch. However, I've done such a port ( 2.4
-> 2.6 ) for an ARM architecture, so I'm not completly new to this
either ( even if ARM and PPC are little alike ... )

PS2: Sorry if it's a duplicate, I just had problems with my mail server
queue and don't know wich mail were 'lost'. After waiting 2h to see it
appear on the list and still nothing, I supposed the first one was lost.


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