Re: [Qemu-devel] [Qemu-ppc] [PATCH 00/77] ppc: Add "native" POWER8 platform

[Alexey Kardashevskiy]

On 11/11/2015 03:16 PM, Benjamin Herrenschmidt wrote:
> On Wed, 2015-11-11 at 15:07 +1100, Alexey Kardashevskiy wrote:
> > p/qemu-powernv/ppc64-softmmu/qemu-system-ppc64 -m 2048 -machine
> > powernv \
> > -nographic -vga none -initrd t/le.cpio -kernel t/vml420le -bios \
> > skiboot.lid -smp 1,threads=1
> >
> > just hangs at:
> >
> > [1491287872,5] INIT: Waiting for kernel...
> > [1493257423,5] Assuming kernel at 0x20000000
> > [1494710040,5] INIT: Kernel loaded, size: 0 bytes (0 = unknown
> > preload)
> > [1497506414,5] INIT: 64-bit LE kernel discovered
> > [1500827972,5] INIT: 64-bit kernel entry at 0x20010000
> > [1505594383,3] OCC: No HOMER detected, assuming no pstates
> > [1507983930,3] ELOG: Error getting buffer to log error
> > [1556792870,5] Free space in HEAP memory regions:
> > [1559724738,5] Region ibm,firmware-heap free: 12778984
> > [1561377946,5] Region ibm,address@hidden
> >   free: 376992
> > [1563789914,5] Total free: 13155976
> > [1565066925,5] INIT: Starting kernel at 0x20010000, fdt at 0x30350610
> > (size
> > 0x2ce4)
> Hrm, works for me, I've been testing various LE kernels including a
> full ubuntu distro in there, we need to debug that further. Does that
> same kernel actually work on real HW ?

Ok, as we figured out, CONFIG_PPC_EARLY_DEBUG is responsible for this as it 
does hypercalls in the very beginning.

> > If I try LE disk image (ubuntu 14), it just crashes:
> >
> > p/qemu-powernv/ppc64-softmmu/qemu-system-ppc64 -m 2048 -machine
> > powernv \
> > -nographic -vga none img/u14_32GB_cuda7.qcow2 -bios skiboot.lid \
> > -smp 1,threads=1
> > qemu: hardware error: qemu: could not load kernel'(null)'
> Right, we don't load kernels from disk, you need to pass a -kernel that
Worth mentioning as well ;)

> typically is the openpower bootloader (Linux + petitboot). My plan is
> to make the pnv platform automatically extract these things from a ROM
> image of an openpower eval board (aka palmetto) which you can build
> from github. It's a bit too big to include as a binary in qemu however
> (about 16M).
git submodule?

Another note. I tried to know what the default devices are and got another 
crash:
(qemu) info qtree
bus: main-system-bus
  type System
  dev: phb3-msi, id ""
/home/aik/p/qemu-powernv/hw/core/sysbus.c:276:sysbus_dev_print: Object 
0x100279e9500 is not an instance of type sys-bus-device


--
Alexey