開發板：A33，運行linux-3.4.39

主機：Ubuntu 14.04

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復位或啟動開發板后，等串口輸出秒讀提示，如果是標準uboot，按任意鍵可中斷啟動過程，進入uboot命令行界面。

A33 uboot默認bootdelay為0，所以正常開機情況下不能進入uboot命令行。如果想進入uboot命令行，按如下操作修改。

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1. 修改bootdelay

進入：~/A33-Vstar/dragonboard/brandy/u-boot-2011.09

打開commom/main.c

將348行：bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;

修改為：bootdelay = 4;

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2. 編譯uboot

執行：sudo ./build.sh -p sun8iw5p1

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3. 打包&下載

打包：進入~/A33-Vstar/dragonboard，執行：sudo ./build.sh pack

打包成功后下載固件到A33開發板

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4. 進入uboot命令行

開機后進入秒讀界面時，按任意鍵進入uboot命令行。

按PC任意鍵，進入uboot：

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5. BootLoader階段輸出的信息：

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HELLO! BOOT0 is starting!

boot0 version : 3.1.0

reg_addr 0x01f00100 =0x00000000

reg_addr 0x01f00104 =0x00000000

reg_addr 0x01f00108 =0x00000000

reg_addr 0x01f0010c =0x00000000

reg_addr 0x01f00110 =0x00000000

reg_addr 0x01f00114 =0x00000000

DRAM DRIVE INFO: V1.5

DRAM CLK =552 MHZ

DRAM simple test OK.

dram size =512

card boot number = 2

card no is 2

sdcard 2 line count 0

[mmc]: mmc driver ver 2014-07-07 16:54

[mmc]: ***Try SD card 2***

[mmc]: mmc 2 cmd 8 timeout, err 0x00000100

[mmc]: mmc 2 cmd 8 err 0x00000100

[mmc]: mmc 2 send if cond failed

[mmc]: mmc 2 cmd 55 timeout, err 0x00000100

[mmc]: mmc 2 cmd 55 err 0x00000100

[mmc]: mmc 2 send app cmd failed

[mmc]: ***Try MMC card 2***

[mmc]: MMC ver 4.5

[mmc]: SD/MMC Card: 4bit, capacity: 3776MB

[mmc]: vendor: Man 0x00450100 Snr 0x3a004a97

[mmc]: product: SEM04

[mmc]: revision: 4.7

[mmc]: ***SD/MMC 2 init OK!!!***

sdcard 2 init ok

The size of uboot is 0x000bc000.

sum=0x77d84f79

src_sum=0x77d84f79

set_mmc_para,sdly 50M 0

set_mmc_para,sdly 25M 0

Succeed in loading uboot from sdmmc flash.

Ready to disable icache.

Jump to secend Boot.

[ 0.337]

U-Boot 2011.09-rc1-00004-ga1ab41d (Jul 28 2014 - 16:21:09) Allwinner Technology

[ 0.346]version: 1.1.0

[ 0.431]pmbus: ready

[ 0.433]PMU: AXP221

[ 0.435]PMU: AXP22x found

[ 0.439]PMU: dcdc3 1200

[ 0.442]PMU: pll1 1008 Mhz,PLL6=600 Mhz

AXI=336 Mhz,AHB=200 Mhz, APB1=100 Mhz

set power on vol to default

dcdc1_vol = 3000

dcdc2_vol = 1100

dcdc3_vol = 1200

dcdc4_vol = 0

dcdc5_vol = 1500

aldo2_vol = 2500

aldo3_vol = 3000

find power_sply to end

no battery, limit to dc

fel key old mode

run key detect

no key found

0x6a

dram_para_set start

dram_para_set end

[ 0.489]DRAM: 512 MiB

relocation Offset is: 15b11000

smcl's set manager is NULL

workmode = 0

MMC: 2

[ 0.687][mmc]: mmc driver ver 2014-07-15 17:16:00

[ 0.692][mmc]: get sdc_2xmode ok, val = 1

[ 0.696][mmc]: get sdc_f_max fail,use default sdc_f_max 50000000

[ 0.702][mmc]: get card_line ok, card_line = 4

[ 0.707][mmc]: get sdc_ex_dly_used fail,use default dly

[ 0.71]: SUNXI SD/MMC: 2

[ 0.717][mmc]: mmc 2 2xmode config clk

[ 0.729][mmc]: ************Try SD card 2************

[ 0.734][mmc]: mmc 2 cmd 8 timeout, err 100

[ 0.739][mmc]: smc 2 err, cmd 8, RTO

[ 0.744][mmc]: mmc 2 mmc cmd 8 err 0x00000100

[ 0.748][mmc]: mmc send if cond failed

[ 0.752][mmc]: mmc 2 cmd 55 timeout, err 100

[ 0.756][mmc]: smc 2 err, cmd 55, RTO

[ 0.762][mmc]: mmc 2 mmc cmd 55 err 0x00000100

[ 0.766][mmc]: send app cmd failed

[ 0.769][mmc]: ************Try MMC card 2************

[ 0.795][mmc]: mmc 2 2xmode config clk

[ 0.805][mmc]: mmc 2 2xmode config clk

[ 0.815][mmc]: mmc 2 2xmode config clk

[ 0.824][mmc]: MID 000045 PSN 004a979d

[ 0.827][mmc]: PNM SEM04G -- 0x53-45-4d-30-34-47

[ 0.832][mmc]: PRV 3.10

[ 0.835][mmc]: MDT m-10 y-2015

[ 0.838][mmc]: MMC ver 4.5

[ 0.841][mmc]: ---------------mmc->clock 50000000-----------

[ 0.846][mmc]: ---------------mmc->bus_width 4--------------

[ 0.852][mmc]: SD/MMC Card: 4bit, capacity: 3776MB

[ 0.857][mmc]: boot0 capacity: 2000KB,boot1 capacity: 2000KB

[ 0.863][mmc]: ************SD/MMC 2 init OK!!!************

[ 0.869]sunxi flash init ok

In: serial

Out: serial

Err: serial

--------fastboot partitions--------

-total partitions:6-

-name- -start- -size-

boot-res : 1000000 1000000

env : 2000000 1000000

boot : 3000000 1000000

rootfs : 4000000 40000000

data : 44000000 40000000

UDISK : 84000000 0

-----------------------------------

base bootcmd=run setargs_nand boot_normal

bootcmd set setargs_mmc

key 0

recovery key high 5, low 3

cant find fstbt value

no misc partition is found

misc_message->command = 0

to be run cmd=run setargs_mmc boot_normal

mount part name boot-res

cant open script.bin, maybe it is not exist

WORK_MODE_BOOT

board_status_probe

[ 0.952]pre sys mode

sunxi_bmp_logo_display

[ 0.977][mmc]: blkcnt should not be 0

screen_id =0, screen_width =800, screen_height =480

[ 0.987]Hit any key to stop autoboot: 4

read boot or recovery all

[ 1.604]sunxi flash read :offset 3000000, 13955823 bytes OK

no signature

[ 1.615]ready to boot

para err in disp_ioctl, cmd = 0xa,screen id = 1

[ 1.621][mmc]: mmc exit start

[ 1.625][mmc]: mmc 2 2xmode config clk

[ 1.633][mmc]: mmc 2 2xmode config clk

[ 1.645][mmc]: mmc 2 cmd 8 timeout, err 100

[ 1.650][mmc]: smc 2 err, cmd 8, RTO

[ 1.655][mmc]: mmc 2 mmc cmd 8 err 0x00000100

[ 1.659][mmc]: mmc send if cond failed

[ 1.663][mmc]: mmc 2 cmd 55 timeout, err 100

[ 1.667][mmc]: smc 2 err, cmd 55, RTO

[ 1.673][mmc]: mmc 2 mmc cmd 55 err 0x00000100

[ 1.677][mmc]: send app cmd failed

[ 1.688][mmc]: mmc 2 exit ok

[ 1.691]

Starting kernel ...

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分析：根據開機打印的信息，A33在內核引導階段實際上經歷了三個過程：

1）boot0階段

主要是自檢RAM和FLASH，并從FLASH中加載uboot

2）second boot階段，即u-boot階段

3）starting kernel階段

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也就表明，A33 BootLoader階段包含了boot0和uboot兩個過程。

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