1U-Boot for the Boundary Devices Nitrogen6X and 2Freescale i.MX6Q SabreLite boards 3 4This file contains information for the port of 5U-Boot to the Boundary Devices Nitrogen6X and 6Freescale i.MX6Q SabreLite boards. 7 81. Boot source, boot from SPI NOR 9--------------------------------- 10The configuration in this directory supports both the 11Nitrogen6X and Freescale SabreLite board, but in a 12different fashion from Freescale's implementation in 13board/freescale/mx6qsabrelite. 14 15In particular, this image supports booting from SPI NOR 16and saving the environment to SPI NOR. 17 18It does not support 'boot from SD' at offset 0x400 19except through the 'bmode' command. 20 http://lists.denx.de/pipermail/u-boot/2012-August/131151.html 21 222. Boots using 6x_bootscript on SATA or SD card 23----------------------------------------------- 24The default bootcmd for these boards is configured 25to look for and source a boot script named '6x_bootscript' 26in the root of the first partition of the following 27devices: 28 29 sata 0 30 mmc 0 31 mmc 1 32 33They're searched in the order listed above, trying both the 34ext2 and fat filesystems. 35 362. Maintaining the SPI NOR 37-------------------------- 38A 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. 45 463. Display support 47------------------ 48U-Boot support for the following displays is configured by 49default: 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 56Since the ipuv3_fb display driver currently supports only a single display, 57this code auto-detects panel by probing the HDMI Phy for Hot Plug Detect 58or the I2C touch controller of the LVDS and RGB displays in the priority 59listed above. 60 61Setting 'panel' environment variable to one of the names above will 62override auto-detection and force activation of the specified panel. 63 644. Building 65------------ 66 67To build U-Boot for one of the Nitrogen6x or SabreLite board: 68 69 make nitrogen6x_config 70 make 71 72Note that 'nitrogen6x' is a placeholder. The complete list of supported 73board 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 81The -6q variants support either the i.MX6Quad or i.MX6Dual processors 82and are configured for a 64-bit memory bus at 1066 MHz. 83 84The -6dl variants also use a 64-bit memory bus, operated at 800MHz. 85 86The -6s variants use a 32-bit memory bus at 800MHz. 87 88If you place the u-boot.imx into a single-partition SD card 89along with a binary version of the boot script 6x_upgrade.txt, 90you can program it using 'upgradeu': 91 92 U-Boot> run upgradeu 93