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 MiB
board/sunxi/board.c:sunxi_board_init()
common/spl/spl.c:board_init_r()
Trying to boot from FEL
common/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 Technology
lib/display_options.c:display_options()
U-Boot code: 4A000000 -> 4A052740 BSS: -> 4A08D938
common/board_f.c:display_text_info()
CPU: Allwinner H3 (SUN8I 1680)
arch/arm/mach-sunxi/cpu_info.c:print_cpuinfo()
Model: Xunlong Orange Pi Zero
common/board_info.c:show_board_info()
DRAM: 256 MiB
board/sunxi/board.c:dram_init()
common/board_f.c:show_dram_config()
Relocation Offset is: 05f62000
Relocating to 4ff62000, new gd at 4bf41ee8, sp at 4bf3dec0
common/board_f.c:setup_reloc()
< - init_sequence_f end
*/
/*
init_sequence_r start - >
common/board_r.c:initr_trace()
MMC: SUNXI SD/MMC: 0
common/board_r.c:initr_mmc()
MMC: no card present
mmc_init: -123, time 2
*** Warning - MMC init failed, using default environment
common/console.c:console_init_r()-1
In: serial
Out: serial
Err: serial
->board/sunxi/board.c:misc_init_r()
-> common/board_r.c:initr_ethaddr()
Net: phy interface0
eth0: ethernet@1c30000
net/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 1.00
USB1: USB OHCI 1.0
scanning bus 0 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot: 0
-> common/cli.c:cli_loop()
=>
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