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

[Benjamin Herrenschmidt]

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 ?

> 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
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).

> Right. With the note that it goes with -bios :)

Not necessarily, it will be in the right place and loaded without an
explicit -bios.

Cheers,
Ben.