The main changes are:
* virtio-serial
* booting speed imrovement
* better PCI bridge support

The complete changelog is:
  > virtio-serial: Fix compile error
  > scsi: Remove debug functions from scsi-loader.fs
  > scsi: Remove unused read-6 command
  > obp-tftp: Remove the ciregs-buffer
  > libnet: Simplify the net-load arguments passing
  > libnet: Simplify the Forth-to-C wrapper of ping()
  > Do not link libnet to net-snk anymore, and remove net-snk from board-qemu
  > Add a Forth-to-C wrapper for the ping command, too
  > Link libnet code to Paflof and add a wrapper for netboot()
  > Remember execution tokens of "write" and "read" for socket operations
  > Add virtio-serial device support
  > Generalize output banner write routine
  > Improve indentation in OF.fs
  > scsi: implement READ (16) command
  > rtas: Improve rtas-do-config-@ and rtas-do-config-! a little bit
  > libnet: Make netapps.h includable from .code files
  > libnet: Remove unused prototypes from netapps.h
  > libnet: Fix the printout of the ping command
  > libnet: Make sure to close sockets when we're done
  > scsi: implement read-capacity-16
  > pci: Fix secondary and subordinate PCI bus enumeration with board-qemu
  > pci-phb: Fix stack underflow in phb-pci-walk-bridge
  > paflof: Add a read() function to read keyboard input
  > paflof: Add socket(), send() and recv() functions to paflof
  > paflof: Provide get_timer() and set_timer() helper functions
  > paflof: Add a write_mm_log helper function
  > paflof: Copy sbrk code from net-snk
  > paflof: Use CFLAGS from make.rules instead of completely redefining them
  > Do not include the FCode evaluator by default anymore
  > Source code beautification of board-qemu/slof/pci-interrupts.fs
  > Allow PCI devices in PCI bridge slots greater than 4
  > Fix bad interrupt pin numbering in interrupt-map property of PCI bridges
  > Improve SLOF_alloc_mem_aligned()
  > instance: Fix set-my-args for empty arguments
  > Fix remaining compiler warnings in sloffs.c
  > Remove misleading padding fields from ROM header definition
  > Improve indentation in calculatecrc.h
  > Do not include calculatecrc.h from assembler files
  > Remove unused defines in calculatecrc.h
  > libnet: Re-initialize global variables at the beginning of tftp()
  > Remove dependency on cpu/@0 for booting
  > usb: Set XHCI slot speed according to port status
  > usb: Build correct route string for USB3 devices behind a hub
  > usb: Initialize USB3 devices on a hub and keep track of hub topology
  > usb: Increase amount of maximum slot IDs and add a sanity check
  > usb: Move XHCI port state arrays from header to .c file
  > tools: add copy functionality
  > tools: added support to sloffs to read from /dev/slof_flash
  > tools: added file append functionality
  > tools: use crc checking code from romfs/tools
  > tools: added initial version of sloffs
  > romfs: factored out crc code, to make it usable from other locations
  > tools: remove unused parts from the Makefile
  > usb-hid: Fix non-working comma key
  > fat-files: Fix access to FAT32 dir/files when cluster > 16-bits
  > virtio-net: fix ring handling in receive
  > net: Remove remainders of the MTFTP code
  > net: Move also files from clients/net-snk/app/netapps/ to lib/libnet/
  > net: Move files from clients/net-snk/app/netlib/ to lib/libnet/
  > net-snk: Get rid of netlib and netapps prefixes in include statements
  > usb-xhci: assign field4 before conditional
  > Improve F12 key handling in boot menu
  > Fix stack underflow that occurs with duplicated ESC in input
  > rtas-nvram: optimize erase
  > ipv6: Replace magic number 1500 with ETH_MTU_SIZE (i.e. 1518)
  > ipv6: Fix NULL pointer dereference in ip6addr_add()
  > ipv6: Fix memory leak in set_ipv6_address() / ip6_create_ll_address()
  > ipv6: Clear memory after malloc if necessary
  > ipv6: Fix possible NULL-pointer dereference in send_ipv6()
  > ping: use gateway address for routing
  > ping: add netmask in the ping argument
  > xhci: fix missing keys from keyboard
  > xhci: add memory barrier after filling the trb
  > loaders: Remove netflash command
  > boot: Remove legacy Forth words for network loading
  > base: Move cnt-bits and bcd-to-bin to board-js2x folder
  > base: Move huge-tftp-load variable to obp-tftp package
  > base: Remove unused IP address conversion functions
  > virtio: White space cleanup in virtio-9p.c
  > virtio: Add modern version 1.0 support to 9p driver
  > virtio: Set a proper name for virtio-9p device tree nodes
  > pci: Fix mistype in "unkown-bridge"
  > ipv6: Indent code with tabs, not with spaces
  > ipv6: send_ipv6() has to return after doing NDP
  > ipv6: Do not use unitialized MAC address array
  > ipv6: Add support for sending packets through a router
  > Remove unused sms code.
  > virtio-net: initialize to populate mac address
  > libbootmsg: Do not use '\b' characters when printing checkpoints
  > dev-null: The "read" function has to return 0 if nothing has been read

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>