SD card, eMMC cure, about Bootloader Linux

I. Burn the bootloader into the SD card

1. Format SD card (not mounted): fdisk/dev/sdx-d Delete-N New partition-W save exit 6~default sdx1

Two ways to format: Mkfs-t vfat/dev/sdx1

Mkfs.vfat/dev/sdx1

2. Burn the bootloader into the SD card: NOTE-no mount

./SD_FUSING.SH/DEV/SDX the SD card into the Development board after execution and starts in minicom

Note: Partitioning is the operation of the entire device (SDX) instead of (SDX1)

Two. Burn the linux/andriod system into the SD card, and then solidify the EMMC operation.

1. Format SD card (not mounted): fdisk/dev/sdx-d Delete-N New partition-W save exit 6~default sdx1

Two ways to format: Mkfs-t vfat/dev/sdx1

Mkfs.vfat/dev/sdx1

2. Burn the linux/andriod system into the SD card (without mounting):

./sd_write/dev/sdb. /images/superboot.bin

3. Copy image to Sdx1 (Mount first):

Mount/dev/sdx1/media

CP images/media/*

Three. Burning the Linux kernel

Minicom Common commands:

PRINTENV: Print Environment variables

Bootargs: Startup parameters that determine how the root file system mounts after kernel boot

Bootcmd: For self-booting of the kernel

HELP,BOOTM,MMC List,mmcinfo 0,ext2format,ext2load

1. Partition: Fdisk-p 1 Print partition information

Fdisk-c 1 320 2057 520 (can and only) be divided into four partitions (the remaining space is automatically a partition)

2. Format: Fatformat MMC 1:1

Ext3format MMC 1:2

Ext3format MMC 1:3

Ext3format MMC 1:4

3. Burn write bootloader to eMMC:

eMMC Open 1--opening EMMC

MMC write 1 40000000 0 10

MMC write 1 40000000 10 20 The number of logical blocks is 16 binary

MMC write 1 40000000 30 290

MMC write 1 40000000 2c0 ba

eMMC Close 1--Close eMMC

Note: To this step, you can restart the EMMC mode, transfer the Linux kernel from the PC to the Development Board, and use the minicom to transmit

Then BOOTM 40008000//boot the kernel

　　

4. Burn write Linu kernel and root file system to eMMC 23rd partition:

First step: Attach the Board to the NFS virtual file system

Mkdir/nfsroot

Add/nfsroot * (rm,sync,no_root_squash) to file/etc/exports

Restart the NFS Services service NFS Restart

Copy inittab file CP inittab/nfsroot/etc

Set Startup parameters set Bootargs "Root=/dev/nfs nfsroot=192.168.0.222:/nfsroot ip=192.168.0.20

LCD=S70 console=ttysac0,115200 INIT=LINUXRC "

Saving Save

Note: Ctrl + A (release) W: Turn on wrap (because there are too many variables, you must wrap the line)

Second step: Copy the kernel and root file system with virtual file system

Copy the kernel to the second partition of eMMC

Mount Mount/dev/mmcblk0p2/mnt

Copy the kernel CP zimage/mnt (copy the zimage to the shared directory Nfsroot in the PC)

Uninstall EMMC Second Partition umount/mnt

　　　　　　　　　　

Copy the root file system to the third partition of eMMC

Mount Mount/dev/mmcblk0p3/mnt

Copy root file system CP root_qt*/mnt (first copy root_qt* to shared directory Nfsroot in PC)//Error

Uninstall eMMC Third Partition umount/mnt

Copy inittab--root file system missing part

PC-side: CP inittab/nfsroot/etc/

Minicom Development Board: CP/ETC/INITTAB/MNT/ETC

Note: After manual reset, start from eMMC, next set environment variable in minicom

5. Set the variable:

Set kernel self-boot set bootcmd "ext2load mmc 0:2 40008000 zimage;bootm 40008000"

Set Startup parameters set Bootargs "Root=/dev/mmcblk0p3 console=ttysac0,115200 init=linuxrc lcd=s70"

Saving Save

Note: The EMMC has four partitions, where: the first partition bootloader

Second Partition kernel

Third Partition root file system

2016-01-19

SD card, eMMC cure, about Bootloader Linux