How to build the Linux kernel & u-boot for BeableBone Black.

BeagleBone Black

Linux Kernel & u-boot for the beagleboard.org boards

reference:

Please see https://github.com/beagleboard/linux for the latest official kernels.

kernel

kernel patchset usage

• beaglebone-3.11 patchset:

git checkout origin/3.11 -b 3.11
./patch.sh

• beaglebone-3.12 patchset:

git checkout origin/3.12 -b 3.12
./patch.sh

• beaglebone-3.13 patchset:

git checkout origin/3.13 -b 3.13
./patch.sh

• beaglebone-3.14 patchset:

git checkout origin/3.14 -b 3.14
./patch.sh

u-Boot

• u-boot (univertial boot loader)
• http://www.denx.de/wiki/U-Boot
• Ref.

Source code download

~/bbb/ $ git clone git:://git.denx.de/u-boot.git
~/bbb/ $ git u-boot/

Source code patch

~/bbb/u-boot $ git checkout v2014.07 -b tmp
~/bbb/u-boot $ wget -c https://raw.githubusercontent.com/eewiki/u-boot-patches/master/v2014.07/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch
~/bbb/u-boot $ patch -p1 < 0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch

config & build

~/bbb/u-boot $ make -j2 ARCH=arm CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi- distclean
~/bbb/u-boot $ make -j2 ARCH=arm CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi- am335x_evm_config
Configuring for am335x_evm - Board: am335x_evm, Options: SERIAL1,CONS_INDEX=1,NAND
~/bbb/u-boot $ make -j2 ARCH=arm CROSS_COMPILE=armv7a-hardfloat-linux-gnueabi-

check images

~/u-boot $ ls -l MLO
-rw-r--r-- 1 mscho mscho 83700  9월 19 13:42 MLO
~/u-boot $ ls -l u-boot.img
-rw-r--r-- 1 mscho mscho 450168  9월 19 13:42 u-boot.img

dtb

dtc : device tree compiler

Reference

$ wget -c https://github.com/hephaex/toolchain/tree/master/arm/dtc.sh
$ chmod +x dtc.sh
$ ./dtc.sh

microSD card install

1. Insert the microSD Card into build machine.
   • ls /dev/sdX
2. Begin partioning the microSD Card by typing fdisk /dev/sdX
   • fdisk /dev/sdX
   • a. Initialize a new partition table by selecting o, then verify the partition table is empty by selecting p.
   • b. Create a boot partition by selecting n for ‘new’, then p for ‘primary’, and 1 to specify the first partition. Press enter to accept the default first sector and specify 4095 for the last sector.
   • c. Change the partition type to FAT16 by selecting t for ‘type’ and e for ‘W95 FAT16 (LBA)’.
   • d. Set the partition bootable by selecting a then 1.
   • e. Create the data partition for the root filesystem by selecting n for ‘new’, then p for ‘primary’,and 2 to specify the second partition. Accept the default values for the first and last sectors by pressing enter twice.
   • f. Press p to ‘print’ the partition table.
   • g. Finally, commit the changes by selecting w to ‘write’ the partition table and exit fdisk.

root@ubuntu-armhf:/home/ubuntu# fdisk /dev/mmcblk1

Command (m for help): o
Building a new DOS disklabel with disk identifier 0xef30879d.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
      e   extended
      Select (default p): p
      Partition number (1-4, default 1): 1
      First sector (2048-31116287, default 2048):
      Using default value 2048
      Last sector, +sectors or +size{K,M,G} (2048-31116287, default 31116287): 4095

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): e
Changed system type of partition 1 to e (W95 FAT16 (LBA))

Command (m for help): a
Partition number (1-4): 1

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
      e   extended
      Select (default p): p
      Partition number (1-4, default 2):
      Using default value 2
      First sector (4096-31116287, default 4096):
      Using default value 4096
      Last sector, +sectors or +size{K,M,G} (4096-31116287, default 31116287):
      Using default value 31116287

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Syncing disks.

1. Format the Partitions
   • Format partition 1 as FAT

mkfs.vfat /dev/sdX1

• Format partition 2 as ext4

mkfs.ext4 /dev/sdX2

1. install u-boot to the microSD card

mkdir boot
mount /dev/sdX1 boot
tar xJvf uboot.tar.xz -C boot
umount boot

1. Install the desired root filesystem to the microSD Card.

mkdir rootfs
mount /dev/sdX2 rootfs
tar xJvf ubuntu-trusty-14.04-rootfs-3.14.4.1.tar.xz -C rootfs
umount rootfs

1. The microSD Card is ready to boot.