Re: [microblaze-uclinux] Re: Reg uclinux/microblaze on ml310 (flash woes)

[Ron Sass <rsass@xxxxxxxxxxx>]

Hi Lakshmi,

I'm not a uclinux expert at all but I can answer a few of
your questions about the ML-310.

> Hello Team,
> 
> I am trying to build a lean system with microprocessor on ml310.
> I have abandoned PPC for now, as it takes lot of real estate
> on the fpga. Now with microblaze and uclinux I am still stuck
> with the below problems...

I am not sure what you mean by real estate.  The two PPC cores
are diffused IP.  That means whether you choose to use them or
not, those transistors are there in the silicon!

Are you looking at synthesis/map/par files to determine how much
logic is being used when you enable the PPC?  Perhaps its it is
the busses and the rest of the system needed to support the PPC???


> uclinux doesnt build libraries if Library OS parameters -> Flash ->
> "none" is provided. It needs external flash!
> 
> I found FLASH ROM on ml310 board, but it is accessible only from ALi
> SouthBridge which sits on PCI bus. This means I need to add in
> PCI arbiter/PCI Bus which would take all the real estate away again!!!

Yes, the PCI interface is large and yes to access the small FLASH
you have to go through the ALi.  Unfortunately, the resources committed
to the PCI board is an artifact of the ML-310 board design.
 
> I wouldnt want this as I need a lean system with as much space
> as possible and running linux!
> 
> There is a COMPACT Flash accessible from the SysACE controller.
> As mentioned in my previous mail it is accessible from microblaze.
> Is there a way to build uclinux with Sysace Controller???
> Or better yet without any flash at all??

I believe I have built a Linux 2.6 kernel and Base System Platform
that has no PCI but does have the SysACE controller.  I'm not sure
because my end goal is to get 2.6 ported to the ML-310 with PCI
and that was just a stepping stone.

 
> A montavista linux base is possible without PCI bus and flash but
> with PPC (which I havent yet figured to run with single core and
> successful JTAG)

I don't understand what you are asking/saying here.
 
> shouldn't uclinux also provide such a facility?
> 
> Please let me know.
> 
> Thanks
> LN

Good luck with your project.

Ron
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