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全面剖析U-Boot with SPL启动过程：
U-Boot SPL 2017.03-rc2-gc7a25b3-dirty (Mar 15 2017 - 17:35:37)common/spl/spl.c:preloader_console_init()DRAM: 256 MiBboard/sunxi/board.c:sunxi_board_init()common/spl/spl.c:board_init_r()Trying to boot from FELcommon/spl/spl.c:boot_from_devices()/*init_sequence_f start - >U-Boot 2017.03-rc2-gc7a25b3-dirty (Mar 15 2017 - 17:35:37 +0800) Allwinner Technologylib/display_options.c:display_options()U-Boot code: 4A000000 -> 4A052740 BSS: -> 4A08D938common/board_f.c:display_text_info()CPU: Allwinner H3 (SUN8I 1680)arch/arm/mach-sunxi/cpu_info.c:print_cpuinfo()Model: Xunlong Orange Pi Zerocommon/board_info.c:show_board_info()DRAM: 256 MiBboard/sunxi/board.c:dram_init()common/board_f.c:show_dram_config()Relocation Offset is: 05f62000Relocating to 4ff62000, new gd at 4bf41ee8, sp at 4bf3dec0common/board_f.c:setup_reloc()< - init_sequence_f end*//*init_sequence_r start - >common/board_r.c:initr_trace()MMC: SUNXI SD/MMC: 0common/board_r.c:initr_mmc()MMC: no card presentmmc_init: -123, time 2*** Warning - MMC init failed, using default environmentcommon/console.c:console_init_r()-1In: serialOut: serialErr: serial->board/sunxi/board.c:misc_init_r()-> common/board_r.c:initr_ethaddr()Net: phy interface0eth0: ethernet@1c30000net/eth-uclass.c:eth_initialize()main_loop start:common/main.c:main_loop()-> common/cli.c:cli_init()-> common/cli_hush.c:u_boot_hush_start()-> common/main.c:run_preboot_environment_command()preboot cmd:usb start ->starting USB...USB0: USB EHCI 1.00USB1: USB OHCI 1.0scanning bus 0 for devices... 1 USB Device(s) found scanning usb for storage devices... 0 Storage Device(s) foundHit any key to stop autoboot: 0 -> common/cli.c:cli_loop()=> =>
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