Basic support for Firestone and Garrison systems

Firestone and Garrison are IBM branded OpenPOWER systems.
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-firestone/conf/machine/firestone.conf b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-firestone/conf/machine/firestone.conf
new file mode 100644
index 0000000..42f2d29
--- /dev/null
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-firestone/conf/machine/firestone.conf
@@ -0,0 +1,12 @@
+KMACHINE = "aspeed"
+KERNEL_DEVICETREE = "${KMACHINE}-bmc-opp-${MACHINE}.dtb"
+
+require conf/machine/include/ast2400.inc
+require conf/machine/include/obmc-bsp-common.inc
+require conf/machine/include/ibm.inc
+
+UBOOT_MACHINE_firestone = "palmetto_config"
+UBOOT_ENTRYPOINT = "0x40008000"
+UBOOT_LOADADDRESS = "0x40008000"
+
+FLASH_SIZE = "32768"