mx6: Add Phytec PCM058 i.MX6 Quad

Add Phytec-i.MX6 SOM with NAND

  Support:
   - 1GB RAM
   - Ethernet
   - SPI-NOR Flash
   - NAND (1024 MB)
   - external SD
   - UART

Signed-off-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/board/phytec/pcm058/README b/board/phytec/pcm058/README
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+Board information
+-----------------
+
+The SBC produced by Phytec has a SOM based on a i.MX6Q.
+The SOM is sold in two versions, with eMMC or with NAND. Support
+here is for the SOM with NAND.
+The evaluation board "phyBoard-Mira" is thought to be used
+together with the SOM.
+
+More information on the board can be found on manufacturer's
+website:
+
+http://www.phytec.de/produkt/single-board-computer/phyboard-mira/
+http://www.phytec.de/fileadmin/user_upload/images/content/1.Products/SOMs/phyCORE-i.MX6/L-808e_1.pdf
+
+Building U-Boot
+-------------------------------
+
+$ make pcm058_defconfig
+$ make
+
+This generates the artifacts SPL and u-boot.img.
+The SOM can boot from NAND or from SD-Card, having the SPI-NOR
+as second option.
+The dip switch "DIP-1" on the board let choose between
+NAND and SD.
+
+DIP-1 set to off:	Boot first from NAND, then try SPI
+DIP-1 set to on:	Boot first from SD, then try SPI
+
+The bootloader was tested with DIP-1 set to on. If a SD-card
+is present, then the RBL tries to load SPL from the SD Card, if not,
+RBL loads from SPI-NOR. The SPL tries then to load from the same
+device where SPL was loaded (SD or SPI). Booting from NAND is
+not supported.