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beagleboneblack [2014/10/23 00:25] – detailed use of fdisk cedric.eloybeagleboneblack [2018/05/22 10:33] (current) – external edit 127.0.0.1
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 +====== Getting started with BeagleBoneBlack ======
 +
 +Interesting links:
 +
 +  * http://eewiki.net/display/linuxonarm/BeagleBone+Black
 +  * http://blog.logikonlabs.com/how-to-create-a-custom-microsd-card-image-for-the-beaglebone-black/
 +  * http://www.crashcourse.ca/wiki/index.php/Minimal_scratch_build_for_BBB
 +
 +Toolchain from Linaro: arm-linux-gnueabihf-gcc (GCC 4.8.3)
 +
 +===== U-Boot =====
 +
 +
 +The BeagleBoneBlack is fully supported in mainline U-Boot (currently tested with U-Boot 2014.04)
 +
 +<code>
 +make O=bbb CROSS_COMPILE=arm-linux-gnueabihf am335x_boneblack_config
 +make O=bbb CROSS_COMPILE=arm-linux-gnueabihf
 +</code>
 +
 +  * ''O='' specifices the output build directory
 +  * This will generate MLO and u-boot.img under ''bbb/'' 
 +
 +===== Bootable microSD =====
 +
 +Make two partitions:
 +
 +  * boot partition: FAT16, starting at offset 1MB, for MLO, u-boot.img and kernel zImage
 +  * linux partion: ext3 for rootfs
 +
 +> :!:  Before running below commands be sure of which device is your to-be-formatted microSD card. In this example we take ''/dev/sdd'' . You might loose data if you run the wrong command!
 +
 +<code>
 +sudo sfdisk --in-order --Linux --unit M /dev/sdd << EOF
 +1,48,0xE,*
 +,,,-
 +EOF
 +</code>
 +
 +Format the first partition in FAT16 for boot
 +<code>
 +sudo mkfs.vfat -F 16 /dev/sdd1 -n boot
 +</code>
 +
 +Format the second in EXT3 for the root filesystem
 +<code>
 +sudo mkfs.ext3 /dev/sdd2 -L rootfs
 +</code>
 +and untar the generated filesystem:
 +<code>
 +sudo tar -xvzf rootfs.tar.gz /mnt/rootfs
 +</code>
 +
 +or 
 +
 +write the complete second partition with the rootfs image produced by buildroot (no formatting is necessary in this case, but only a part of the remaining SD space will be available).
 +<code>
 +sudo dd -if=rootfs.ext2 -of=/dev/sdd2
 +</code>
 +
 +===== Write to on-board eMMC ====
 +
 +eMMC is already partitionned in /dev/mmcblk1p1 and /dev/mmcblk1p2. 
 +
 +You need a running system to reprogram the on-board eMMC.
 +
 +Create three partitions as follows (note the first bootable DOS partition) with fdisk
 +<code>
 +        Device Boot      Start         End      Blocks  Id System
 +/dev/mmcblk1p1   *          33        3104       98304   e Win95 FAT16 (LBA)
 +/dev/mmcblk1p2            3105       18730      500032  83 Linux
 +/dev/mmcblk1p3           18731       34356      500032  83 Linux
 +</code>
 +
 +<code>
 +# fdisk /dev/mmcblk1
 +
 +The number of cylinders for this disk is set to 118016.
 +There is nothing wrong with that, but this is larger than 1024,
 +and could in certain setups cause problems with:
 +1) software that runs at boot time (e.g., old versions of LILO)
 +2) booting and partitioning software from other OSs
 +   (e.g., DOS FDISK, OS/2 FDISK)
 +
 +Command (m for help): p
 +
 +Disk /dev/mmcblk1: 3867 MB, 3867148288 bytes
 +4 heads, 16 sectors/track, 118016 cylinders
 +Units = cylinders of 64 * 512 = 32768 bytes
 +
 +        Device Boot      Start         End      Blocks  Id System
 +/dev/mmcblk1p1   *          33        3104       98304   e Win95 FAT16 (LBA)
 +/dev/mmcblk1p2            3105      118016     3677184  83 Linux
 +
 +Command (m for help): d
 +Partition number (1-4): 1
 +
 +Command (m for help): d
 +Selected partition 2
 +
 +Command (m for help): n
 +Command action
 +   e   extended
 +   p   primary partition (1-4)
 +p
 +Partition number (1-4): 1
 +First cylinder (1-118016, default 1): 33
 +Last cylinder or +size or +sizeM or +sizeK (33-118016, default 118016): 3104
 +
 +Command (m for help): a
 +Partition number (1-4): 1
 +
 +Command (m for help): t
 +Selected partition 1
 +Hex code (type L to list codes): e
 +Changed system type of partition 1 to e (Win95 FAT16 (LBA))
 +
 +Command (m for help): p
 +
 +Disk /dev/mmcblk1: 3867 MB, 3867148288 bytes
 +4 heads, 16 sectors/track, 118016 cylinders
 +Units = cylinders of 64 * 512 = 32768 bytes
 +
 +        Device Boot      Start         End      Blocks  Id System
 +/dev/mmcblk1p1   *          33        3104       98304   e Win95 FAT16 (LBA)
 +
 +Command (m for help): n
 +Command action
 +   e   extended
 +   p   primary partition (1-4)
 +p
 +Partition number (1-4): 2
 +First cylinder (1-118016, default 1): 3105
 +Last cylinder or +size or +sizeM or +sizeK (3105-118016, default 118016): +512M
 +
 +Command (m for help): p
 +
 +Disk /dev/mmcblk1: 3867 MB, 3867148288 bytes
 +4 heads, 16 sectors/track, 118016 cylinders
 +Units = cylinders of 64 * 512 = 32768 bytes
 +
 +        Device Boot      Start         End      Blocks  Id System
 +/dev/mmcblk1p1   *          33        3104       98304   e Win95 FAT16 (LBA)
 +/dev/mmcblk1p2            3105       18730      500032  83 Linux
 +
 +Command (m for help): n
 +Command action
 +   e   extended
 +   p   primary partition (1-4)
 +p
 +Partition number (1-4): 3
 +First cylinder (1-118016, default 1): 18731
 +Last cylinder or +size or +sizeM or +sizeK (18731-118016, default 118016): +512M
 +
 +Command (m for help): p
 +
 +Disk /dev/mmcblk1: 3867 MB, 3867148288 bytes
 +4 heads, 16 sectors/track, 118016 cylinders
 +Units = cylinders of 64 * 512 = 32768 bytes
 +
 +        Device Boot      Start         End      Blocks  Id System
 +/dev/mmcblk1p1   *          33        3104       98304   e Win95 FAT16 (LBA)
 +/dev/mmcblk1p2            3105       18730      500032  83 Linux
 +/dev/mmcblk1p3           18731       34356      500032  83 Linux
 +
 +Command (m for help): w
 +The partition table has been altered.
 +Calling ioctl() to re-read partition table
 +# 
 +
 +</code>
 +
 +Mount the partitions so that you can copy content to it:
 +
 +<code>
 +mkdir -p /mnt/emmc-boot
 +mkdir -p /mnt/emmc-rootfsA
 +mount -t vfat /dev/mmcblk1p1 /mnt/emmc-boot/
 +umount /mnt/emmc-boot/
 +mkfs.vfat /dev/mmcblk1p1
 +mkfs.ext2 /dev/mmcblk1p2 
 +mount -t vfat /dev/mmcblk1p1 /mnt/emmc-boot/
 +mount -t ext2 /dev/mmcblk1p2 /mnt/emmc-rootfsA/
 +</code>
 +
 +Copy MLO, u-boot.img and uEnv.txt (in this order) to the partition. This can be done directly from your host via scp:
 +<code>
 +scp MLO root@192.168.1.4:/mnt/emmc-boot/MLO
 +scp u-boot.img uEnv.txt   root@192.168.1.4:/mnt/emmc-boot/
 +</code>
 +
 +Extract the rootfs image to the target and write it to the second partition
 +<code>
 +scp rootfs.tar  root@192.168.1.4:/tmp/rootfs.tar
 +rm -rf /mnt/emmc-rootfsA/* 
 +tar xvf /tmp/rootfs.tar -C /mnt/emmc-rootfsA/ 
 +sync
 +</code>
 +
 +===== Enable UARTs ====
 +
 +Be sure BB-BONELT-HDMI is not autoloaded. In uEnv.txt add:
 +<code>
 +optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
 +</code>
 +
 +Load Device Tree overlays for UARTs
 +<code>
 +echo BB-UART1 > /sys/devices/bone_capemgr.9/slots
 +echo BB-UART4 > /sys/devices/bone_capemgr.9/slots
 +echo BB-UART5 > /sys/devices/bone_capemgr.9/slots
 +</code>
 +
 +Set the baudrate on the command line:
 +<code>
 +stty -F /dev/ttyO1 115200
 +</code>
 +
 +===== Remote debugging =====
 +
 +Run gdbserver on target:
 +<code>
 +# gdbserver :1234 helloworld
 +</code>
 +
 +Start the cross-gdb on host (with ddd as frontend):
 +<code>
 +ddd --debugger arm-linux-gnueabihf-gdb --eval-command="target remote 192.168.1.4:1234" helloworld
 +</code>
 +
 +===== 3G modem =====
 +
 +Enable USB support in kernel:
 +<code>
 +Device Drivers --> USB Support --> <*>   Support for Host-side USB
 +Device Drivers --> USB Support --> <*>   USB Mass Storage support
 +Device Drivers --> USB Support --> <*>     Platform Glue Layer (TI DSPS platforms)
 +</code>
 +
 +Enable PPP interface with usb_modeswitch (for Huawei E303) :
 +<code>
 +usb_modeswitch -v 0x12d1 -p 0x1f01 -V 0x12d1 -P 0x14dc -M "55534243123456780000000000000a11062000000000000100000000000000"
 +</code>
 +
  
beagleboneblack.txt · Last modified: 2018/05/22 10:33 by 127.0.0.1