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diff --git a/board/boundary/nitrogen6x/README b/board/boundary/nitrogen6x/README new file mode 100644 index 0000000..5049093 --- /dev/null +++ b/board/boundary/nitrogen6x/README @@ -0,0 +1,92 @@ +U-Boot for the Boundary Devices Nitrogen6X and +Freescale i.MX6Q SabreLite boards + +This file contains information for the port of +U-Boot to the Boundary Devices Nitrogen6X and +Freescale i.MX6Q SabreLite boards. + +1. Boot source, boot from SPI NOR +--------------------------------- +The configuration in this directory supports both the +Nitrogen6X and Freescale SabreLite board, but in a +different fashion from Freescale's implementation in +board/freescale/mx6qsabrelite. + +In particular, this image supports booting from SPI NOR +and saving the environment to SPI NOR. + +It does not support 'boot from SD' at offset 0x400 +except through the 'bmode' command. + http://lists.denx.de/pipermail/u-boot/2012-August/131151.html + +2. Boots using 6x_bootscript on SATA or SD card +----------------------------------------------- +The default bootcmd for these boards is configured +to look for and source a boot script named '6x_bootscript' +in the root of the first partition of the following +devices: + + sata 0 + mmc 0 + mmc 1 + +They're searched in the order listed above, trying both the +ext2 and fat filesystems. + +2. Maintaining the SPI NOR +-------------------------- +A couple of convenience commands + + clearenv - clear environment to factory default + upgradeu - look and source a boot script named + '6x_upgrade' to upgrade the U-Boot version + in SPI NOR. The search is the same as for + 6x_bootscript described above. + +3. Display support +------------------ +U-Boot support for the following displays is configured by +default: + + HDMI - 1024 x 768 for maximum compatibility + Hannstar-XGA - 1024 x 768 LVDS (Freescale part number MCIMX-LVDS1) + wsvga-lvds - 1024 x 600 LVDS (Boundary p/n Nit6X_1024x600) + wvga-rgb - 800 x 480 RGB (Boundary p/n Nit6X_800x480) + +Since the ipuv3_fb display driver currently supports only a single display, +this code auto-detects panel by probing the HDMI Phy for Hot Plug Detect +or the I2C touch controller of the LVDS and RGB displays in the priority +listed above. + +Setting 'panel' environment variable to one of the names above will +override auto-detection and force activation of the specified panel. + +4. Building +------------ + +To build U-Boot for one of the Nitrogen6x or SabreLite board: + + make nitrogen6x_config + make u-boot.imx + +Note that 'nitrogen6x' is a placeholder. The complete list of supported +board configurations is shown in tha MAINTAINERS file: + nitrogen6q i.MX6Q/6D 1GB + nitrogen6dl i.MX6DL 1GB + nitrogen6s i.MX6S 512MB + nitrogen6q2g i.MX6Q/6D 2GB + nitrogen6dl2g i.MX6DL 2GB + nitrogen6s1g i.MX6S 1GB + +The -6q variants support either the i.MX6Quad or i.MX6Dual processors +and are configured for a 64-bit memory bus at 1066 MHz. + +The -6dl variants also use a 64-bit memory bus, operated at 800MHz. + +The -6s variants use a 32-bit memory bus at 800MHz. + +If you place the u-boot.imx into a single-partition SD card +along with a binary version of the boot script 6x_upgrade.txt, +you can program it using 'upgradeu': + + U-Boot> run upgradeu |