emmc boot1 boot2 partition

你的名字 2022-11-07 14:30 312阅读 0赞

使用mfg tool烧写android5.1的镜像之后，再使用旧版的mfg tool烧写linux或者android镜像，都不能正常启动，而且运行的uboot还是android5.1版本的uboot。

参考链接

[http://www.itdadao.com/articles/c15a39492p0.html][http_www.itdadao.com_articles_c15a39492p0.html]

[http://www.cnblogs.com/heiyue/p/5199851.html\#undefined][http_www.cnblogs.com_heiyue_p_5199851.html_undefined]

[http://www.cnblogs.com/heiyue/p/5830505.html][http_www.cnblogs.com_heiyue_p_5830505.html]

[https://linux.codingbelief.com/zh/storage/flash\_memory/emmc/emmc\_partitions.html][https_linux.codingbelief.com_zh_storage_flash_memory_emmc_emmc_partitions.html]

[https://community.nxp.com/thread/331306][https_community.nxp.com_thread_331306]

[https://freescale.jiveon.com/thread/429311][https_freescale.jiveon.com_thread_429311]

[http://blog.5ibc.net/p/80599.html][http_blog.5ibc.net_p_80599.html]

emmc boot分区

在同事的帮助下才知道emmc有boot1，boot2以及RPMB(Replay Protected Memory Block),GPAP(General Purpose Area Partitions,最多可以有4个)，UDA（User Data Area)分区。而我们一般只知道UDA分区。

我们通常对emmc进行分区，也只是对UDA分区。boot1,boot2,RPMB分区是固定的，我们并不能控制器大小和分区格式。如下图所示（图片摘自网络）：

![6cf9cf8d3f03862eacf549d205feda7f.png][]

这次的android5.1镜像将uboot烧写到了boot1分区，并且将boot1分区使能。那么emmc每次启动之后就从boot1分区启动，运行android5.1的uboot，而android5.1的uboot又找不到其对应的kernel等镜像（因为UDA的区域的镜像已经烧写成别的版本），所以就一直卡在启动的页面。

并且写到emmc寄存器中的值是一直保留的,不会因为开机就恢复为默认值。

而原来的工具是将uboot放在UDA分区。

android5.1的mfg tool中，ucl2.xml有那么一段。(我添加了注释)

<CMD state="Updater" type="push" body="$ echo 0 > /sys/block/mmcblk%mmc%boot0/force_ro">access boot partition 1</CMD>
    	<CMD state="Updater" type="push" body="send" file="files/android/%folder%/u-boot-imx%soc%%plus%.imx" >Sending u-boot.bin</CMD>
    
    	<CMD state="Updater" type="push" body="$ dd if=$FILE of=/dev/mmcblk%mmc%boot0 bs=512 seek=2">write U-Boot to sd card</CMD>
    
    	<CMD state="Updater" type="push" body="$ echo 1 > /sys/block/mmcblk%mmc%boot0/force_ro"> re-enable read-only access </CMD>
    
    	<CMD state="Updater" type="push" body="$ mmc bootpart enable 1 1 /dev/mmcblk%mmc%">enable boot partion 1 to boot</CMD>

emmc boot寄存器

下图是emmc寄存器设置。

不使能引导，将BOOT\_PARTITION\_ENABLE设置为0，

使能boot1，将BOOT\_PARTITION\_ENABLE设置为1，

使能boot2，将BOOT\_PARTITION\_ENABLE设置为2，

使能UDA，将BOOT\_PARTITION\_ENABLE设置为7.

![96a02e011673928fc1645b12a6caf745.png][]

解决方法

在uboot中有emmc命令，用于设置emmc的寄存器。uboot版本不同，命令有些不一样。

FSL 2009.08 U-boot       u-boot-fslc branch patches-2014.07
    args      mmc bootpart             mmc partconf dev boot_ack boot_partition partition_access
    
    example for change boot partition to device 2 partition 1:
                mmc bootpart 2 1        mmc partconf 2 1 1 1
    
    example for change boot partition to device 2 partition 0:
                mmc bootpart 2 0        mmc partconf 2 1 0 1

具体操作如下：

# uboot中首先查看emmc的编号
    Tony> mmc list
    FSL_SDHC: 0
    FSL_SDHC: 1
    FSL_SDHC: 2 (eMMC)
    # 确定emmc的序号是2
    # 查看emmc命令
    Tony> 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 hwpartition [args...] - does hardware partitioning
      arguments (sizes in 512-byte blocks):
        [user [enh start cnt] [wrrel {on|off}]] - sets user data area attributes
        [gp1|gp2|gp3|gp4 cnt [enh] [wrrel {on|off}]] - general purpose partition
        [check|set|complete] - mode, complete set partitioning completed
      WARNING: Partitioning is a write-once setting once it is set to complete.
      Power cycling is required to initialize partitions after set to complete.
    mmc bootbus dev boot_bus_width reset_boot_bus_width boot_mode
     - Set the BOOT_BUS_WIDTH field of the specified device
    mmc bootpart-resize <dev> <boot part size MB> <RPMB part size MB>
     - Change sizes of boot and RPMB partitions of specified device
    mmc partconf dev boot_ack boot_partition partition_access
     - Change the bits of the PARTITION_CONFIG field of the specified device
    mmc rst-function dev value
     - Change the RST_n_FUNCTION field of the specified device
       WARNING: This is a write-once field and 0 / 1 / 2 are the only valid values.
    mmc setdsr <value> - set DSR register value
    
    # 设置emmc的启动分区，主要是partconf后面的第一个和第三个参数。
    # 2是emmc的编号，第三个参数设置启动的分区，对应寄存器BOOT_PARTITION_ENABLE字段。设为0表示不使能。 
    Tony> mmc partconf 2 0 0 0
    # 或者设置为7表示从UDA启动, 0和7我都尝试了，烧录原来的镜像都能够启动成功。
    Tony> mmc partconf 2 0 7 0

或者更改ucl2.xml文件，使能UDA分区。

<CMD state="Updater" type="push" body="$ mmc bootpart enable 0 1 /dev/mmcblk%mmc%">enable boot partion 1 to boot</CMD>
    或者
    
    <CMD state="Updater" type="push" body="$ mmc bootpart enable 7 1 /dev/mmcblk%mmc%">enable boot partion 1 to boot</CMD>

Author

Tony Liu

2016-11-11, Shenzhen

[http_www.itdadao.com_articles_c15a39492p0.html]: http://www.itdadao.com/articles/c15a39492p0.html
[http_www.cnblogs.com_heiyue_p_5199851.html_undefined]: http://www.cnblogs.com/heiyue/p/5199851.html#undefined
[http_www.cnblogs.com_heiyue_p_5830505.html]: http://www.cnblogs.com/heiyue/p/5830505.html
[https_linux.codingbelief.com_zh_storage_flash_memory_emmc_emmc_partitions.html]: https://linux.codingbelief.com/zh/storage/flash_memory/emmc/emmc_partitions.html
[https_community.nxp.com_thread_331306]: https://community.nxp.com/thread/331306
[https_freescale.jiveon.com_thread_429311]: https://freescale.jiveon.com/thread/429311
[http_blog.5ibc.net_p_80599.html]: http://blog.5ibc.net/p/80599.html
[6cf9cf8d3f03862eacf549d205feda7f.png]: /images/20221023/4b51fcefb5af44a89d93183ecd81fb1e.png
[96a02e011673928fc1645b12a6caf745.png]: /images/20221023/3b011a8f4cda49b2b58b2432d1675b8f.png