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@@ -66,6 +66,22 @@ CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o)
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CONFIG_SPL_RAM_DEVICE (common/spl/spl.c)
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CONFIG_SPL_WATCHDOG_SUPPORT (drivers/watchdog/libwatchdog.o)
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+Device tree
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+-----------
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+The U-Boot device tree is filtered by the fdtgrep tools during the build
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+process to generate a much smaller device tree used in SPL (spl/u-boot-spl.dtb)
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+with:
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+- the mandatory nodes (/alias, /chosen, /config)
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+- the nodes with one pre-relocation property:
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+ 'u-boot,dm-pre-reloc' or 'u-boot,dm-spl'
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+
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+ftgrep is also used to remove:
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+- the properties defined in CONFIG_OF_SPL_REMOVE_PROPS
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+- all the pre-relocation properties
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+ ('u-boot,dm-pre-reloc', 'u-boot,dm-spl' and 'u-boot,dm-tpl')
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+
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+All the nodes remaining in the SPL devicetree are bound
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+(see driver-model/README.txt).
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Debugging
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---------
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