Difference between revisions of "Sd boot rootfs"

Revision as of 10:47, 12 January 2017

Notes

• The micro SD card/adapter has to be modified or the USB cable with appropriate host computer driver is needed to boot from the uSD card - see Tmp_manual#Boot for instructions.
• EXT4 partition mounted as /.

Prepare the card

PC:

• After all of the targets are built in poky use files from .../poky/build/tmp/deploy/images/elphel393/mmc/:
  • boot.bin
  • u-boot-dtb.img
  • devicetree.dtb
  • uImage
  • rootfs.tar.gz
• Partition table: msdos (gpt won't work) Format into 2 partitions: FAT32 and EXT4 (use gparted or command line instructions below), the order of partitions is important or change bootargs in the device tree accordingly.
• FAT32: copy the following files:
  • • boot.bin
    • u-boot-dtb.img
    • devicetree.dtb
    • uImage
• If EXT4 is not empty - format it or delete old contents
• Mount EXT4 to some <mountpoint>
  • unpack the rootfs.tar.gz, console:

tar -C <mountpoint> -xzpf rootfs.tar.gz

Boot

• Insert, power on

Format micro SD card (command line, can be done in the booted from NAND flash camera)

Example for /dev/sdX:

• create partitions with fdisk , gparted or any other program:
  • the 1st partition is to be formatted to FAT32 - 1GB is more than enough
  • the 2nd partition is to be formatted to EXT4 - 2+GB

formatting with mkfs:

• mkfs.vfat -F 32 /dev/sdX1

• mkfs.ext4 /dev/sdX2