eMMC切换成NAND后不开机问题
时间：10-02
整理：3721RD
点击：
1、进行EMMC到NAND flash的切换
请首先参考相关文档，不同平台上的参考文档有所差异，具体如下：
MT6575和MT6577平台，请DCC上下载文档：Nand vs EMMC feature switch
MT6572平台，DCCNand vs EMMC feature switch_MT6572
文档中提到需要申请patch，要确认贵司的软件版本来确认coebase中是否已经有patch内容，可以联系mtk确认，patch确认后，按照文档中的要求进行相关改动，主
要包括如下几处的改动：
配置custom_memoryDevice.h，设置要使用的nandflash。
修改ProjectConfig.mk中MTK_NAND_PAGE_SIZE
\mediatek\config\${project}\autoconfig\kconfig\project文件
Cust_nand.h
修改DWS，确认Flash相关的GPIO正确配置
2、编译后下载如果开机异常
请首先使用usrt抓取开机过程的kernel log，
如果log中有看到如下信息：
[ 2.882658] (0)[1:init]BOOTPROF: 2882.630692:INIT:NAND:Mount_START
[ 2.884471] (0)[1:init]BOOTPROF: 2884.451153:INIT:NAND:Mount_END
或者
[ 8.221849] (0)[1:init]BOOTPROF: 8221.845384:INIT:NAND:Mount_START
[ 8.221876] (0)[1:init]init: command 'write /proc/bootprof INIT:NAND:Mount_START' r=0
[ 8.234254] (0)[1:init]init: command 'mount yaffs2 mtd@system /system' r=-1
[ 8.234293] (0)[1:init]init: command 'mkdir /system/secro 0600 system' r=-30
[ 8.234335] (0)[1:init]init: command 'mount yaffs2 mtd@system /system' r=-1
[ 8.236942] (1)[65:bat_thread_kthr][fg_get_data_ready_status] Reg[0x6a]=0x2
[ 8.237888] (1)[1:init]init: command 'mount yaffs2 mtd@userdata /data' r=-1
[ 8.238795] (1)[1:init]init: command 'mount yaffs2 mtd@cache /cache' r=-1
[ 8.239679] (1)[1:init]BOOTPROF: 8239.675231:INIT:NAND:Mount_END
或者
Couldn't find valid filesystem superblock.
e[ 3.031977] (1)[1:init]init: cannot find '/system/bin/xlog', disabling 'xlogboot'
up[ 3.173762] (1)[1:init]init: cannot find '/system/bin/servicemanager', disabling
'servicemanager'
[ 3.174885] (1)[1:init]init: cannot find '/system/bin/vold', disabling 'vold'
则表示nand文件系统没有正确加载，
请检查下面的配置：
\mediatek\config\${project}\autoconfig\kconfig\project中
# CONFIG_MTK_MTD_NAND is not set 去除（保留此句注释依然会编到）
CONFIG_MTK_MTD_NAND=y “=”前后都不能有空格
下面内容需要添加：
CONFIG_YAFFS_FS=y
CONFIG_YAFFS_YAFFS1=y
# CONFIG_YAFFS_9BYTE_TAGS is not set
# CONFIG_YAFFS_DOES_ECC is not set
CONFIG_YAFFS_YAFFS2=y
CONFIG_YAFFS_AUTO_YAFFS2=y
CONFIG_YAFFS_DISABLE_TAGS_ECC=y
# CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED is not set
# CONFIG_YAFFS_EMPTY_LOST_AND_FOUND is not set
# CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING is not set
# CONFIG_YAFFS_DISABLE_BACKGROUND is not set
CONFIG_YAFFS_XATTR=y
如果确认如上配置没有问题，请提交E-Service，并上传如下文件：kernel log，custom_MemoryDevice.h和MemoryDeviceList_{platform}.xls
请首先参考相关文档，不同平台上的参考文档有所差异，具体如下：
MT6575和MT6577平台，请DCC上下载文档：Nand vs EMMC feature switch
MT6572平台，DCCNand vs EMMC feature switch_MT6572
文档中提到需要申请patch，要确认贵司的软件版本来确认coebase中是否已经有patch内容，可以联系mtk确认，patch确认后，按照文档中的要求进行相关改动，主
要包括如下几处的改动：
配置custom_memoryDevice.h，设置要使用的nandflash。
修改ProjectConfig.mk中MTK_NAND_PAGE_SIZE
\mediatek\config\${project}\autoconfig\kconfig\project文件
Cust_nand.h
修改DWS，确认Flash相关的GPIO正确配置
2、编译后下载如果开机异常
请首先使用usrt抓取开机过程的kernel log，
如果log中有看到如下信息：
[ 2.882658] (0)[1:init]BOOTPROF: 2882.630692:INIT:NAND:Mount_START
[ 2.884471] (0)[1:init]BOOTPROF: 2884.451153:INIT:NAND:Mount_END
或者
[ 8.221849] (0)[1:init]BOOTPROF: 8221.845384:INIT:NAND:Mount_START
[ 8.221876] (0)[1:init]init: command 'write /proc/bootprof INIT:NAND:Mount_START' r=0
[ 8.234254] (0)[1:init]init: command 'mount yaffs2 mtd@system /system' r=-1
[ 8.234293] (0)[1:init]init: command 'mkdir /system/secro 0600 system' r=-30
[ 8.234335] (0)[1:init]init: command 'mount yaffs2 mtd@system /system' r=-1
[ 8.236942] (1)[65:bat_thread_kthr][fg_get_data_ready_status] Reg[0x6a]=0x2
[ 8.237888] (1)[1:init]init: command 'mount yaffs2 mtd@userdata /data' r=-1
[ 8.238795] (1)[1:init]init: command 'mount yaffs2 mtd@cache /cache' r=-1
[ 8.239679] (1)[1:init]BOOTPROF: 8239.675231:INIT:NAND:Mount_END
或者
Couldn't find valid filesystem superblock.
e[ 3.031977] (1)[1:init]init: cannot find '/system/bin/xlog', disabling 'xlogboot'
up[ 3.173762] (1)[1:init]init: cannot find '/system/bin/servicemanager', disabling
'servicemanager'
[ 3.174885] (1)[1:init]init: cannot find '/system/bin/vold', disabling 'vold'
则表示nand文件系统没有正确加载，
请检查下面的配置：
\mediatek\config\${project}\autoconfig\kconfig\project中
# CONFIG_MTK_MTD_NAND is not set 去除（保留此句注释依然会编到）
CONFIG_MTK_MTD_NAND=y “=”前后都不能有空格
下面内容需要添加：
CONFIG_YAFFS_FS=y
CONFIG_YAFFS_YAFFS1=y
# CONFIG_YAFFS_9BYTE_TAGS is not set
# CONFIG_YAFFS_DOES_ECC is not set
CONFIG_YAFFS_YAFFS2=y
CONFIG_YAFFS_AUTO_YAFFS2=y
CONFIG_YAFFS_DISABLE_TAGS_ECC=y
# CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED is not set
# CONFIG_YAFFS_EMPTY_LOST_AND_FOUND is not set
# CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING is not set
# CONFIG_YAFFS_DISABLE_BACKGROUND is not set
CONFIG_YAFFS_XATTR=y
如果确认如上配置没有问题，请提交E-Service，并上传如下文件：kernel log，custom_MemoryDevice.h和MemoryDeviceList_{platform}.xls
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