Re: [Qemu-devel] [PATCH 0/6] ppc: add a IBM 40p machine (RS/6000, PReP)

[Hervé Poussineau]

Le 11/01/2017 à 17:58, Artyom Tarasenko a écrit :
> Hi Hervé,
>
> nice work!
>
> On Thu, Dec 29, 2016 at 11:12 PM, Hervé Poussineau <address@hidden> wrote:
> > Hi,
> >
> > This patchset adds the emulation of the IBM RS/6000 7020 (40p). The real 
> > machine is
> > able to run AIX (up to 4.3.3), Windows NT (up to 4.0 SP1), the beta of OS/2 
> > PowerPC,
> > Solaris, Linux, NetBSD/PReP ...
> >
> > I've tested current emulation with Open Hack'Ware, OpenBIOS and official 
> > firmware.
> >
> > Linux kernel starts, and freezes during boot (like with 'prep' machine).

I already saw a regression during 2.7.0 cycle with 603 CPU. However, I was 
unable to provide kernel source, so Benjamin was unable to find the problem.
http://lists.gnu.org/archive/html/qemu-devel/2016-08/msg03760.html

> If prep can't do it anymore, it looks like a regression. I definitely
> remember seen a sitting penguin and a login prompt ~ 2 years ago. At
> least with OFW.
>
> > Windows NT starts up to the point where it wants to change endianness.
>
> I hit that with Solaris/PPC a few years back as you published your
> previous attempt. Do you know what is missing? I guess CPU endianness
> switch emulation is working because it is used in the newer POWER
> CPUs. Is it just the systemIO which has to be improved, or is it more?

Yes, PReP System I/O has LE flag which is not implemented.
You may be interested by 
ftp://ftp.software.ibm.com/rs6000/technology/spec/endian.ps
which deals about endianness switching, with some code from Windows NT/PPC

> > Other OSes have not been tested.
> >
> > This machine is a superset of the 'prep' one, because we know exactly what 
> > is/should
> > emulated, and that operating system list running on it is quite wide.
> > I hope that 'prep' machine can be deprecated soon and then later removed.
>
> Would be nice to keep 'prep' until the 40p can boot Linux and NetBSD
> 6.1.3 (this version used to work with -M prep last time I checked).

Some Linux kernels seem to work, some other ones seem to not work (hang while 
booting)
I've not searched why.

I tried NetBSD 6.1.3/PReP.
cdroms/harddisks don't boot anymore with Open Hack'Ware since some changes in 
IDE core
Kernel boots better with 40p than with prep

====================================================
prep:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 6.1.3 (INSTALL)
Model: Qemu
total memory = 128 MB
avail memory = 119 MB
panic: call to null-ptr from 0x0

The operating system has halted.
Please press any key to reboot.

====================================================
40p/Open Hack'Ware:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 6.1.3 (INSTALL)
Model: Qemu
total memory = 128 MB
avail memory = 119 MB
mainbus0 (root)
cpu0 at mainbus0: 604 (Revision 1.3), ID 0 (primary)
cpu0: HID0 0xc084<ICE,DCE,SGE,BHT>, powersave: 1
cpu0: 0.00 MHz
Couldn't find PNP data for bus 0 devfunc 0x0
pnpbus0 at mainbus0
pci0 at mainbus0 bus 0: indirect configuration space access
pchb0 at pci0 dev 0 function 0
pchb0: vendor 0x1057 product 0x4801 (rev. 0x00)
siop0 at pci0 dev 1 function 0: Symbios Logic 53c810 (fast scsi)
siop0: couldn't map interrupt
vga0 at pci0 dev 2 function 0: vendor 0x1234 product 0x1111 (rev. 0x02)
wsdisplay0 at vga0 (kbdmux ignored)
drm at vga0 not configured
pcn0 at pci0 dev 3 function 0: AMD PCnet-PCI Ethernet
pcn0: Am79c970A PCnet-PCI II rev 0, Ethernet address 52:54:00:12:34:56
pcn0: unable to map interrupt
pcib0 at pci0 dev 11 function 0: vendor 0x8086 product 0x0484 (rev. 0x03)
isa0 at pcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0 (mux ignored)
vmmask 10000000 schedmask 10000000 highmask 70000000
boot device: mainbus0
root on md0a dumps on md0b
root file system type: ffs
WARNING: no TOD clock present
WARNING: using filesystem time
WARNING: CHECK AND RESET THE DATE!
erase ^H, werase ^W, kill ^U, intr ^C, status ^T
Terminal type? [vt100]

====================================================
40p/official firmware with cdrom boot:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 6.1.3 (INSTALL)
Model: IBM PPS Model 6015
total memory = 128 MB
avail memory = 119 MB
trap: kernel read DSI trap @ 0x481b4cae by 0x2a4f50 (DSISR 0x40000000, err=14), 
lr 0x140e84
panic: trap

The operating system has halted.
Please press any key to reboot.
====================================================

OpenBIOS doesn't support PReP boot partitions (type 0x41) nor PReP kernels so 
this is a no-go yet.

Regards,

Hervé