am57xx-evm: Add the AM57xx machine type

* Add the AM57xx machine type which is used to differentiate
  between the AM57xx and the DRA7xx which are derivative devices
  with different HW platforms and SoC capabilities.

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Acked-by: Franklin Cooper Jr. <fcooper@ti.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

conf/machine/am57xx-evm.conf

@@ -0,0 +1,36 @@
+#@TYPE: Machine
+#@NAME: DRA7xx EVM
+#@DESCRIPTION: Machine configuration for the TI DRA7xx EVM
+
+require conf/machine/include/dra7xx.inc
+
+IMAGE_FSTYPES += "ubi tar.gz"
+
+SERIAL_CONSOLE = "115200 ttyO0"
+
+UBOOT_MACHINE = "dra7xx_evm_config"
+
+# UBI information.  Note that this is board and kernel specific.  Changes
+# in your kernel port may require changes in these variables.  For more
+# details about this board please see
+# http://processors.wiki.ti.com/index.php/UBIFS_Support
+
+# do ubiattach /dev/ubi_ctrl -m 7 -O 2048
+# From dmesg:
+# UBI: smallest flash I/O unit:    2048
+# UBI: logical eraseblock size:    126976 bytes
+# from ubiattach stdout:
+# UBI device number 0, total 1988 LEBs
+MKUBIFS_ARGS = "-F -m 2048 -e 126976 -c 3836"
+
+# do ubiattach /dev/ubi_ctrl -m 7 -O 2048
+# from dmesg:
+# UBI: smallest flash I/O unit:    2048
+# UBI: physical eraseblock size:   131072 bytes (128 KiB)
+# UBI: sub-page size:              512
+# UBI: VID header offset:          2048 (aligned 2048)
+UBINIZE_ARGS = "-m 2048 -p 128KiB -s 512 -O 2048"
+
+# Currently removing the sgx machine feature because there is no SGX package
+# available for omap5
+MACHINE_FEATURES = "kernel26 apm usbgadget usbhost vfat ext2 screen touchscreen"