README: document standard image variables
With these documented, we can start pushing towards standardizing their use across boards. Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com> Cc: Mike Frysinger <vapier@gentoo.org>utp
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README
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README
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@ -3558,6 +3558,25 @@ List of environment variables (most likely not complete):
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Ethernet is encapsulated/received over 802.1q
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Ethernet is encapsulated/received over 802.1q
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VLAN tagged frames.
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VLAN tagged frames.
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The following image location variables contain the location of images
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used in booting. The "Image" column gives the role of the image and is
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not an environment variable name. The other columns are environment
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variable names. "File Name" gives the name of the file on a TFTP
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server, "RAM Address" gives the location in RAM the image will be
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loaded to, and "Flash Location" gives the image's address in NOR
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flash or offset in NAND flash.
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*Note* - these variables don't have to be defined for all boards, some
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boards currenlty use other variables for these purposes, and some
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boards use these variables for other purposes.
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Image File Name RAM Address Flash Location
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----- --------- ----------- --------------
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u-boot u-boot u-boot_addr_r u-boot_addr
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Linux kernel bootfile kernel_addr_r kernel_addr
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device tree blob fdtfile fdt_addr_r fdt_addr
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ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
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The following environment variables may be used and automatically
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The following environment variables may be used and automatically
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updated by the network boot commands ("bootp" and "rarpboot"),
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updated by the network boot commands ("bootp" and "rarpboot"),
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depending the information provided by your boot server:
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depending the information provided by your boot server:
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