Re: Pegasos port freezes at uvm_km_alloc1

["Frank Wille" <frank%phoenix.owl.de@localhost>]

Matt Thomas wrote:

> > > >Status: I get the copyright-message on screen, UVM is initialized,
> > > > but the system freezes at the end of uvm_km_alloc1(), while trying
> > > > to clear the first page of kernel memory with memset().
> > > 
> > > Are the L1/L2/L3 caches enabled?
> > 
> > I think they're not. Should I enable the L2 caches before cpu_attach()?

I don't think this is required, but I tried to enable L2 (512K)
at the end of initppc() now. No effect.


> > BTW, where are the L1 caches enabled? I didn't find it in the source.
> > 
> > It's a 750CXe system, so L3 caches will be no problem.
> 
> L1 is usually tuned on in locore before you transfer control to initppc.

L1 was already turned on by OFW as it seems (I'm not doing it
in locore). I have inserted some debugging output in initppc():

before oea_init(): HID0=0x8090c28c, MSR=0x00000000
after oea_init():  HID0=0x8090c28c, MSR=0x00001032
                              ^
                           ICE|DCE

MMU is enabled, caches are enabled (even L2). Everything looks ok.


> > > What bats are you initializing?
> > 
> > oea_batinit(0) should setup a but for the first 256M of RAM. Nothing
> > else... I think.
> 
> That's your problem.  oea_batinit should only get I/O bats. It'll init
> the BATs needed to address physical RAM (including 0) by itself.

Now oea_batinit() got the following:
        oea_batinit(0x80000000,BAT_BL_256M,
                    0xc0000000,BAT_BL_256M,
                    0xd0000000,BAT_BL_256M,0);

This maps PCI-I/O and PCI-memory space. Maybe I should also map
ISA-space at 0xfe000000, but there are only four BAT registers.

Anyway, it doesn't help. Still freezes when accessing 0x60001000
(KERNEL_SRs are 6,7).


-- 
   _  Frank Wille (frank%phoenix.owl.de@localhost)
_ //  http://devnull.owl.de/~frank/
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