uboot中往s5p6818的emmc刷写内容

建立分区：

 fdisk    :0x4000000  : :

fdisk 

Partition Map for MMC device   --   Partition Type: DOS

Part    Start Sector    Num Sectors     UUID            Type
                                -
                           -
                         -
Vendor: Man  Snr f348b4bc Rev: 0.6 Prod: 8GND3R
            Type: Removable Hard Disk
            Capacity: 7456.0 MB = 7.2 GB ( x )

三个分区，对应的都是用扇区为单位进行表示的（一个扇区=512bits）

终端输入

printenv

显示如下内容

androidcrc=-
baudrate=
bootargs=lcd=at070tn92 tp=gslx680-linux root=/dev/mmcblk0p3 rw rootfstype=ext4
bootcmd=mmc read 0x48000000  ; bootm 0x48000000
bootcmd2=bootm 0x48000000
bootdelay=
bootfile=uImage
ethact=dwmac.c0060000
ethaddr=:e2:1c:ba:e8:
ethprime=RTL8211
fastboot=flash=mmc,:ubootpak:2nd:0x200,0x78000;flash=mmc,:2ndboot:2nd:0x200,0x4000\
;flash=mmc,:bootloader:boot:0x8000,0x70000;flash=mmc,:boot:ext4:0x00100000,0x04000000\
;flash=mmc,:system:ext4:0x04100000,0x2F200000;flash=mmc,:cache:ext4:0x33300000,0x1AC00000\
;flash=mmc,:misc:emmc:0x4E000000,0x00800000;flash=mmc,:recovery:emmc:0x4E900000,0x01600000\
;flash=mmc,:userdata:ext4:0x50000000,0x0;
fileaddr=
gatewayip=192.168.20.1
ipaddr=192.168.20.112
netmask=255.255.255.0
serverip=192.168.20.30
stderr=serial
stdin=serial
stdout=seri

然后就是输入

help

看看uboot可以进行的操作有什么了；

       - do nothing, unsuccessfully
       - do nothing, successfully
?       - alias for 'help'
base    - print or set address offset
bdinfo  - print Board Info structure
boot    - boot default, i.e., run 'bootcmd'
bootd   - boot default, i.e., run 'bootcmd'
bootm   - boot application image from memory
bootp   - boot image via network using BOOTP/TFTP protocol
cmd     - cmd [command] options...
cmp     - memory compare
cp      - memory copy
crc32   - checksum calculation
dhcp    - boot image via network using DHCP/TFTP protocol
drawbmp - darw bmpfile on address 'addr' to framebuffer
env     - environment handling commands
exit    - exit script
ext4load- load binary file from a Ext4 filesystem
ext4ls  - list files in a directory (default /)
ext4write- create a file in the root directory
fastboot- fastboot- use USB Fastboot protocol

fatinfo - print information about filesystem
fatload - load binary file from a dos filesystem
fatls   - list files in a directory (default /)
fatwrite- write file into a dos filesystem
fdisk   - mmc list or create ms-dos partition tables (MAX TABLE )
go      - start application at address 'addr'
goimage - start Image at address 'addr'
help    - print command description/usage
i2c     - I2C sub-system
i2cmod  - set I2C mode
iminfo  - print header information for application image
loadbmp - load bmpfile with command or 'bootlog' environment
loop    - infinite loop on address range
md      - memory display
mdio    - MDIO utility commands
mii     - MII utility commands
mm      - memory modify (auto-incrementing address)
mmc     - MMC sub system
mmcinfo - display MMC info
mtest   - simple RAM read/write test
mw      - memory write (fill)
nm      - memory modify (constant address)
ping    - send ICMP ECHO_REQUEST to network host
pmic    - PMIC
printenv- print environment variables
reset   - Perform RESET of the CPU
run     - run commands in an environment variable
saveenv - save environment variables to persistent storage
sdfuse  - sdfuse  - read images from FAT partition of SD card and write them to booting device.

setenv  - set environment variables
showvar - print local hushshell variables
source  - run script from memory
test    - minimal test like /bin/sh
tftpboot- boot image via network using TFTP protocol
udown   - Download USB
update_mmc- update mmc data

version - print monitor, compiler and linker version

其中可以用来烧写内存的两条命令就是;

 mmc
 mmc - MMC sub system

 Usage:
 mmc info - display info of the current MMC device
 mmc read addr blk# cnt
 mmc write addr blk# cnt
 mmc erase blk# cnt
 mmc rescan
 mmc part - lists available partition on current mmc device
 mmc dev [dev] [part] - show or set current mmc device [partition]
 mmc list - lists available devices
 mmc setdsr <value> - set DSR register value

还有就是

 update_mmc
 update_mmc - update mmc data

 Usage:
 update_mmc <dev no> <type> <mem> <addr> <length>
     - type :  2ndboot | boot | raw | part 

 update_mmc <dev no> boot 'mem' 'addr' 'length' [load addr]
     - update  data 'length' add boot header() on 'mem' to device addr,
       and set jump addr with 'load addr'
       if no [load addr], set jump addr default u-boot _TEXT_BASE_

 update_mmc <dev no> raw 'mem' 'addr' 'length'
     - update data 'length' on 'mem' to device addr.

 update_mmc <dev no> part 'mem' 'part no' 'length'
     - update partition image 'length' on 'mem' to mmc 'part no'.

 Note.
     - All numeric parameters are assumed to be hex.

所以可以通过tftp 把uImage和rootfs都放进去，uImage做成boot.img还有做，使用的方法就是直接烧进去分区地址里面，用的是

mmc write 0x48000000 131080 10806

然后对应的环境变量也要做修改

setenv bootcmd mmc read 0x48000000   \;bootm 0x48000000
saveenv
rese

这样，kernel的镜像就被烧写进去mmc的第二个分区里面了

rootfs的烧写则是需要用

update_mmc  raw 0x48000000 0x8100000 0x1f400000

或者是

mmc write 0x48000000  

然后可以正常使用。

reset