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Ideally, the bootloader EEPROM should be updated before using bootcode4 to run Linux so that full SDRAM init can be loaded. This version fails over to a generic slow configuration if BRCM DDR FW is not found.
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For test/debug purposes it's sometimes useful to erase the SPI EEPROM using a chip-erase command. This has been available via recovery.bin for a while but add it here for convenience.