[Qemu-devel] [PATCH v2 0/6] arm_boot/vexpress-a15: Support >4GB of RAM

[Peter Maydell]

From: Peter Maydell <address@hidden(none)>

This patchset adds support for booting with >4GB of RAM on the
Versatile Express Cortex-A15 model. There are some caveats:
 * you need an LPAE A15 kernel
 * you need to be booting with device tree
 * your device tree blob needs to specify #address-cells and
   #size-cells as 2 (so addresses and sizes are 64 bit), which
   means you'll need to tweak the stock kernel dtb
   [the dtb files for the vexpress boards should be getting this change
   soon, although I'm not sure when it will hit upstream]
 * you need a minor kernel patch which stops the kernel throwing away
   the high 32 bits of the RAM size:
   http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7465/1
   [hopefully coming soon to an upstream kernel near you]
 * you need a 64 bit host, obviously

Changes v1->v2:
 * now based on master, no other dependencies
 * use uint64_t rather than target_phys_addr_t for sizes
 * removed debug tracing
 * tweaked "ram size too big for ATAGS boot" message

NB that (following discussion with Peter C) the device_tree.c
patch is unchanged from v1.

Peter Maydell (6):
  hw/arm_boot.c: Make ram_size a uint64_t
  hw/arm_boot.c: Consistently use ram_size from arm_boot_info struct
  hw/arm_boot.c: Check for RAM sizes exceeding ATAGS capacity
  device_tree: Add support for reading device tree properties
  hw/arm_boot.c: Support DTBs which use 64 bit addresses
  hw/vexpress.c: Allow >4GB of RAM for Cortex-A15 daughterboard

 device_tree.c |   30 ++++++++++++++++++++++++++++++
 device_tree.h |    4 ++++
 hw/arm-misc.h |    2 +-
 hw/arm_boot.c |   46 +++++++++++++++++++++++++++++++++++++++++-----
 hw/vexpress.c |   13 ++++++++++---
 5 files changed, 86 insertions(+), 9 deletions(-)

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1.7.5.4