RE: [microblaze-uclinux] uclinux port to Multimedia board

["Christopher John Comis" <comis@xxxxxxxxxxxxxxxx>]

Hi John, Didier and Mark,

Sorry about my delayed response.

John, I made the corrections you indicated.  The system still hangs as it
did before.  However, now I get 2048 pages, whereas before I only had 256 :)

On node 0 totalpages: 2048
zone(0): 2048 pages.
zone(1): 0 pages.
zone(2): 0 pages.

Didier and Mark, Mark is correct in that I have 32 bits.  However, only 19
of them are mapped to the ZBT pins.  I am using the zbtio peripheral, which
was created by someone in my lab.  I am not too familiar with the
opb_zbt_controller, although I am thinking, as a next step, to try this
peripheral instead of my zbtio core.  Have either of you managed to get
uClinux running with this peripheral?  

As a side note, I hacked into the OS a bit deeper.  The time_init function
(and all subsequent timer initialization) functions are executing correctly.
After these, I can use the get_irq_list(char *) function, and get the
following output:
           CPU0
  0:          0           XINTC  timer
ERR:          0

This function doesn't say a whole lot, other than the interrupt is there.  

I can see the timer is working and the interrupt controller is generating an
interrupt to the processor.  However, neither of the functions
handle_IRQ_event or handle_irq are called.

Like Didier and Mark both alluded to, I'm going to look into the memory a
bit further.  If that is certainly not the problem, I'll likely look into
the interrupt routines in entry.S, and see if those are being accessed.

Any further advice would be greatly appreciated.

Thanks!
Chris


> -----Original Message-----
> From: owner-microblaze-uclinux@itee.uq.edu.au [mailto:owner-microblaze-
> uclinux@itee.uq.edu.au] On Behalf Of John Williams
> Sent: October 24, 2004 10:53 PM
> To: microblaze-uclinux@itee.uq.edu.au
> Subject: Re: [microblaze-uclinux] uclinux port to Multimedia board
> 
> Hi Christopher,
> 
> Christopher John Comis wrote:
> 
> > I am wondering if any of you could please help me out.  I am trying to
> port
> > to the Xilinx Multimedia board.  I made several modifications to
> accommodate
> > the mbvanilla platform to my board:
> 
> > - I set 1MB of my ZBT RAM to base address 0xFE000000-0xFEFFFFFF
> > - I set 8MB of my ZBT RAM to base address 0xFF000000-0xFF7FFFFF (note
> that
> > this memory is actually divided across 4x2MB banks)
> 
> I see you posted a correction to this address map.  So, the physical
> address map is
> 
> 1MB at 0xffe00000 - 0xffefffff
> 8MB at 0xff000000 - 0xff7fffff
> 
> Is this correct?
> 
> [snip]
> 
> > I made the following modifications to the uclinux platform:
> > - I adjusted mbvanilla.h as follows:
> > #define ERAM_ADDR 0xFFE00000
> > #define ERAM_SIZE 0x00100000
> > - I adjusted the address space of mbvanilla.ld as follows:
> > OPB  : ORIGIN = 0xFFE00000, LENGTH = 0x00100000
> 
> This will squish the entire Linux system (kernel + user space memory +
> file system) into a 1MB block based at 0xffe00000.   The 8MB block from
> 0xff000000 will be completely invisible to the kernel.
> 
> Is that your intention?
> 
> Putting the entire kernel + filesystem + user space into 1MB when you
> have 8MB available doesn't make a lot of sense to me, but perhaps you
> have something else in mind for the 8MB block at 0xff000000?
> 
> This may or may not be causing the errors you are seeing, but you should
> confirm what you are trying to do.
> 
> To simplify things at first, I recommend you change ERAM_START and
> ERAM_SIZE to 0xff000000 and 0x00800000 respectively, and similarly in
> the link script.
> 
> One other thing, after you make changes in the link script, you should
> manually delete the file linux-2.4.x/linux.ld - I'm not certain that the
> auto-dependencies are correct, so you might end up linking with an old
> version.
> 
> Cheers,
> 
> John
> ___________________________
> microblaze-uclinux mailing list
> microblaze-uclinux@itee.uq.edu.au
> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-
> uclinux/


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@itee.uq.edu.au
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/