MPC8349EMITXE

[Rafal Jaworowski]

Poul-Henning Kamp wrote:
> I'll be working on getting FreeBSD running on a MPC8349EMITXE
> 
> http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC8349EMITXE
> 
> Anything I should know before I start ?
> 

Expect a lot of excitement:

1. Bootloading, initialization
- the board has U-Boot which does not (yet) support booting FreeBSD 
kernel. For early development you can get away with loading and starting 
kernel manually (objcopy -> binary, then 'tftpload' + 'go'). For 
production environment U-Boot needs to be extended to handle FreeBSD 
kernel, and as mentioned our patches introducing FreeBSD support in 
U-Boot are on the way.

- low-level kernel init - major overhaul is required for initialization 
and setting up basic CPU state as current FreeBSD/powerpc port is 
strictly Mac/OF-oriented.


2. VM
- the CPU is e300 core and the MMU model is the traditional PowerPC 
approach (BATs + segments), which is what the current port has, although 
there's siginificant work required in this area since current code is 
heavily dependent on OF-provided settings, not to mention it is really 
messy and not easily adapted when using a new platform.


3. on-chip devices
- lots of work in this area is required (complete new drivers required 
at least for interrupt controller, PCI bridges, other PQ2 peripherals 
depending on your needs)

- nexus hierarchy: I guess you could base on our on-chip peripheral bus 
implementation that we have for e500 (8555) as it's rather generic and 
the peripherals organization quite similar

- TSEC - 83xx has the same enet controllers as in 85xx (same note as 
above, the driver is under work and being finished)

- DUARTs are 16x50 and uart(4) should work without much problems, so 
getting console output is rather quick

What's your timeline to get this working?

Rafal