[OpenBIOS] Sparc64 OpenBIOS

Nick Couchman Nick.Couchman at seakr.com
Thu Nov 19 21:18:43 CET 2009

>>> On 2009/11/19 at 13:14, Tarl Neustaedter <Tarl.Neustaedter at Sun.COM> wrote: 
> Nick Couchman wrote:
>> [...]
>> So, in trying to track this down further, I need some more help with the 
> debugger in OpenBIOS.  It seems that I have to go through the boot process at 
> least once before I can debug certain things.  For example, if I start up 
> qemu and immediately type "debug do-boot", I'm told "could not locate word for 
> debugging ok",
> Right. do-boot is defined by the primary bootblocks, the code it reads 
> from blocks 1-15. If you're still booting from the Nevada CD, use boot 
> cdrom -H , which will cause it to halt before it executes do-boot. 
> You'll have to clean up -H from the arguments so you can get past the 
> test for halt?.
> I'd suggest:
> ok boot cdrom -H
> ok debug do-boot
> ok do-boot
> (step through until you see the test for halt?, then enter forth and set 
> halt? to false).

Unfortunately the unhandled exception occurs before this check is done:

0 > boot cdrom -H 
[sparc64] Booting file 'cdrom' with parameters '-H'
Not a bootable ELF image
Not a Linux kernel image
Not a bootable a.out image
Loading FCode image...
Loaded 7420 bytes
entry point is 0x4000
Evaluating FCode...
Unaligned access to 0x0000000000000014 from 0x00000000ffd10d9c
Unhandled Exception 0x0000000000000034
PC = 0x00000000ffd10de4 NPC = 0x00000000ffd10de8
Stopping execution

And, yes, still booting from sol-nv-b127-sparc-dvd.iso file...


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