[Qemu-devel] [PATCH 0/9] PPC: e500: Use u-boot as firmware

[Alexander Graf <agraf@suse.de>]

Today we don't run any firmware on our e500 platform. You're either running
a Linux kernel directly through -kernel or you don't boot the VM at all.

This is bad for multiple reasons. The normal firmware on e500 based systems
is u-boot. Some OSes (IIRC FreeBSD) rely on u-boot for their 2nd stage boot
loader. Since that relies on interfaces u-boot provides we can't execute it
today.

The other case where we're falling short of expectations that I'm aware of
is network boot. With a firmware you can actually pxe boot a virtual machine.

This patch set implements all the pieces necessary to run u-boot as the
firmware for our e500 platforms: mpc8544ds and e500plat. It is based on upstream
u-boot code that implements a target specific for the simplified system QEMU
implements.

Due to popular demand the default -kernel booting has *not* been changed from
directly booting into the kernel. This is possible because we don't need to run
firmware to provide run time services.

However, whenever the user explicitly defines a -bios blob, we run it.
That means if you want to route a -kernel boot through u-boot you have to pass
in -bios pc-bios/u-boot.e500 -kernel uImage.

Please try out as many things as you're able to try.

Known missing bits:

  - -boot doesn't get interpreted yet
  - pflash is missing, so the environment is volatile
  - no block drivers available (ata_piix is broken in u-boot and virtio-blk
    is missing)
  - KVM patches to support u-boot are probably going to hit 3.16


Alex

Alexander Graf (9):
  PPC: Make all e500 CPUs SVR aware
  PPC: Add definitions for GIVORs
  PPC: Fix SPR access control of L1CFG0
  PPC: Add L1CFG1 SPR emulation
  PPC: Properly emulate L1CSR0 and L1CSR1
  PPC: Add dcbtls emulation
  PPC: e500: Expose kernel load address in dt
  PPC: Add u-boot firmware for e500
  PPC: e500: Move to u-boot as firmware

 .gitmodules                 |   3 +
 hw/ppc/e500.c               | 134 ++++++++++++++++++++++++++++++--------------
 pc-bios/README              |   5 ++
 pc-bios/u-boot.e500         | Bin 0 -> 264848 bytes
 roms/u-boot                 |   1 +
 target-ppc/cpu-models.c     |  28 ++++-----
 target-ppc/cpu.h            |  19 +++++++
 target-ppc/translate.c      |  12 ++++
 target-ppc/translate_init.c |  30 +++++++---
 9 files changed, 168 insertions(+), 64 deletions(-)
 create mode 100755 pc-bios/u-boot.e500
 create mode 160000 roms/u-boot

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1.8.1.4