[OpenBIOS] Fail to boot a macosx 10.5 disk image

[Cédric Le Goater]

Hello,

This thread was started on qemu-devel@ but openbios@ seems more appropriate 
place now.

On 06/07/2016 10:24 AM, Mark Cave-Ayland wrote:
> On 07/06/16 08:04, Cédric Le Goater wrote:
> > > > > I have an old ibook G4 from which I dd'ed the disk. openbios 
> > > > > complains for some invalid state. is that supported ?
> > >
> > > Yes, OpenBIOS should boot most things these days (MorphOS is the only
> > > execption I know of where the bootloader won't execute correctly as it
> > > assumes real mode). The above message means that OpenBIOS couldn't find
> > > a bootloader, or it could but was unable to execute it, e.g. due to
> > > incompatible architecture - which OS is your image running?
> >
> > I am pretty sure it is a Mac OS X v10.5. I still have the hardware but it
> > is running Linux now :
> >
> > # cat /proc/cpuinfo 
> > processor	: 0
> > cpu		: 7447A, altivec supported
> > clock		: 1333.333000MHz
> > revision	: 1.5 (pvr 8003 0105)
> > bogomips	: 36.86
> >
> > total bogomips	: 36.86
> > timebase	: 18432000
> > platform	: PowerMac
> > model		: PowerBook6,7
> > machine		: PowerBook6,7
> > motherboard	: PowerBook6,7 MacRISC3 Power Macintosh 
> > detected as	: 287 (iBook G4)
> > pmac flags	: 0000001a
> > L2 cache	: 512K unified
> > pmac-generation	: NewWorld
> > Memory		: 1024 MB
> >
> > # lsprop  /proc/device-tree/rom@ff800000/boot-rom@fff00000/
> > reg              fff00000 00100000
> > info             fff00000 00003f00 000493f0 20050705
> >    	 815fda85 fff08000 00078001 000493f0
> >    	 20050705 23765c6c fff80000 00080002
> >    	 000493f0 20050705 b3364dca fff03f00
> >    	 00000083 000493f0 20050705 c2b72d61
> >    	 fff03f80 00000084 e24a68ca 15a82001
> >    	 ffffffff fff04000 00004005 6e767261
> >    	 6d000000 00000000 00000000 00000000
> >    	 [140 bytes total]
> > name             "boot-rom"
> > security-modes   6e6f6e65 2c206675 6c6c2c20 636f6d6d
> >    	 616e642c 206e6f2d 70617373 776f7264
> > image            00080000 (524288)
> > model            "Apple PowerBook6,7 4.9.3f0 BootROM built on 07/05/05 at 11:14:11"
> > write-characteristic
> >    	 "flash"
> > hwi-flags        402a1220 (1076498976)
> > BootROM-version  "$0004.93f0"
> > BootROM-build-date
> >    	 "07/05/05 at 11:14:11"
> > linux,phandle    ff89cb08
> > has-config-block
> > > Have you tried both mac99 and g3beige machines?
> >
> > yes.
>
> (I'm wondering if we should start a new thread here either just on
> qemu-ppc or over on the OpenBIOS list)

doing so on openbios@
> OpenBIOS will read hfs/hfsplus filesystems fine - I wonder if maybe it
> can't locate a suitable partition in the Apple Partition Map?
>
> If you boot to the Forth prompt with -prom-env 'auto-boot?=false' can
> you try the following to see if you can list the disk contents:
>
> dir hd:,\
>
> If that doesn't work it means that the partition auto-detection is
> failing, so try manually forcing the partition number until you find one
> that works e.g.
>
> dir hd:0,\
> dir hd:1,\
> etc.
>
> up until around partition 10? Once you find one that works it should be
> possible to boot that partition directly e.g.
>
> boot hd:1

So it is hd:3 and then, openbios dies directly :

...
    IN: 
    0xfff0d6c8:  mr      r28,r3
    0xfff0d6cc:  add     r30,r30,r3
    0xfff0d6d0:  add     r31,r31,r3
    0xfff0d6d4:  b       0xfff0d6a0

IN: 
    0xfff0d6a0:  mr      r3,r29
    0xfff0d6a4:  li      r5,0
    0xfff0d6a8:  mr      r6,r30
    0xfff0d6ac:  bl      0xfff279e8

IN: 
    0x00000300:  .long 0x0

IN: 
    0x00000700:  .long 0x0

which is this loop in bootcode_load() :

...
    bootcode = loadbase;
    offset = 0;

while(1) {
        if (seek_io(fd, offset) == -1)
            break;
        count = read_io(fd, (void *)bootcode, 512);
        offset += count;
        bootcode += count;
    }
    ...

How do I add more logging with openbios ?

Thanks,

C.