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