[OpenBIOS] Booting SunOS from OpenBIOS

Mark Cave-Ayland mark.cave-ayland at ilande.co.uk
Thu Mar 28 15:23:29 CET 2013

On 28/03/13 13:52, Artyom Tarasenko wrote:

>> Can you put together a quick patch for obp_child() and obp_nextnode() so
>> that if CONFIG_DEBUG_OBP is enabled, they also output the package name in
>> the debug string as well as the phandle? Take a look at how obp_proplen uses
>> get-package-property in order to get hold of the "name" property from the
>> package.
>> (Or in fact, for an even quicker hack, the (void) POP() in obp_proplen() is
>> dropping a pointer to a string itself. So if you display that instead then
>> for your output above you should see the package name displayed)
> Ok. Did the later, and now it looks even stranger:
> obp_proplen(0xffd35ba8, name) = 6  (iommu)
> obp_nextnode(0xffd35ba8) = 0xffd36360
> obp_proplen(0xffd36360, name) = 5  (obio)
> obp_nextnode(0xffd36360) = 0xffd39724
> obp_proplen(0xffd39724, name) = 12  (FMI,MB86904)
> obp_nextnode(0xffd39724) = 0x0
> Unhandled Exception 0x00000007
> But:
> 0>  show-devs
> ffd2e31c /
> [...]
> ffd35ba8 /iommu
> [...]
> ffd36360 /obio (hierarchical)
> [...]
> ffd3972c /FMI,MB86904 (cpu)
> Why does obp_nextnode(0xffd36360) return 0xffd39724 ? According to
> show-devs it must be 0xffd3972c !

Yeah... that doesn't like quite right at all :/

obp_nextnode() is actually very simple in that it just calls the Forth 
"peer" word. Do you see the same phandles if you cycle through the 
device tree using "peer" directly from the OpenBIOS prompt?

0 peer
dup u. peer
dup u. peer
dup u. peer



More information about the OpenBIOS mailing list