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      1 U-Boot for the Boundary Devices Nitrogen6X and
      2 Freescale i.MX6Q SabreLite boards
      3 
      4 This file contains information for the port of
      5 U-Boot to the Boundary Devices Nitrogen6X and
      6 Freescale i.MX6Q SabreLite boards.
      7 
      8 1. Boot source, boot from SPI NOR
      9 ---------------------------------
     10 The configuration in this directory supports both the
     11 Nitrogen6X and Freescale SabreLite board, but in a
     12 different fashion from Freescale's implementation in
     13 board/freescale/mx6qsabrelite.
     14 
     15 In particular, this image supports booting from SPI NOR
     16 and saving the environment to SPI NOR.
     17 
     18 It does not support 'boot from SD' at offset 0x400
     19 except through the 'bmode' command.
     20 	http://lists.denx.de/pipermail/u-boot/2012-August/131151.html
     21 
     22 2. Boots using 6x_bootscript on SATA or SD card
     23 -----------------------------------------------
     24 The default bootcmd for these boards is configured
     25 to look for and source a boot script named '6x_bootscript'
     26 in the root of the first partition of the following
     27 devices:
     28 
     29 	sata 0
     30 	mmc 0
     31 	mmc 1
     32 
     33 They're searched in the order listed above, trying both the
     34 ext2 and fat filesystems.
     35 
     36 2. Maintaining the SPI NOR
     37 --------------------------
     38 A couple of convenience commands
     39 
     40 	clearenv - clear environment to factory default
     41 	upgradeu - look and source a boot script named
     42 		'6x_upgrade' to upgrade the U-Boot version
     43 		in SPI NOR. The search is the same as for
     44 		6x_bootscript described above.
     45 
     46 3. Display support
     47 ------------------
     48 U-Boot support for the following displays is configured by
     49 default:
     50 
     51     HDMI           - 1024 x 768 for maximum compatibility
     52     Hannstar-XGA   - 1024 x 768 LVDS (Freescale part number MCIMX-LVDS1)
     53     wsvga-lvds     - 1024 x 600 LVDS (Boundary p/n Nit6X_1024x600)
     54     wvga-rgb       - 800 x 480 RGB (Boundary p/n Nit6X_800x480)
     55 
     56 Since the ipuv3_fb display driver currently supports only a single display,
     57 this code auto-detects panel by probing the HDMI Phy for Hot Plug Detect
     58 or the I2C touch controller of the LVDS and RGB displays in the priority
     59 listed above.
     60 
     61 Setting 'panel' environment variable to one of the names above will
     62 override auto-detection and force activation of the specified panel.
     63 
     64 4. Building
     65 ------------
     66 
     67 To build U-Boot for one of the Nitrogen6x or SabreLite board:
     68 
     69 	make nitrogen6x_config
     70 	make
     71 
     72 Note that 'nitrogen6x' is a placeholder. The complete list of supported
     73 board configurations is shown in the boards.cfg file:
     74 	nitrogen6q		i.MX6Q/6D	1GB
     75 	nitrogen6dl		i.MX6DL		1GB
     76 	nitrogen6s		i.MX6S		512MB
     77 	nitrogen6q2g    	i.MX6Q/6D	2GB
     78 	nitrogen6dl2g		i.MX6DL		2GB
     79 	nitrogen6s1g		i.MX6S		1GB
     80 
     81 The -6q variants support either the i.MX6Quad or i.MX6Dual processors
     82 and are configured for a 64-bit memory bus at 1066 MHz.
     83 
     84 The -6dl variants also use a 64-bit memory bus, operated at 800MHz.
     85 
     86 The -6s variants use a 32-bit memory bus at 800MHz.
     87 
     88 If you place the u-boot.imx into a single-partition SD card
     89 along with a binary version of the boot script 6x_upgrade.txt,
     90 you can program it using 'upgradeu':
     91 
     92 	U-Boot> run upgradeu
     93