說明：文中全部翻譯的英文文檔
文中是編譯BeagleBone Black的內核
- 下載交叉編譯工具連，假如你是ubuntu直接執行：
apt-get install gcc-arm-linux-gnueabi其他管理器需要執行：
yum install gcc-arm-linux-gnu- 有可能你的系統沒有lzop需要安裝一下，不然make的時候可能提示錯誤：
apt-get install lzop- 爲了後面可以正確的執行 mkimage 還需要下載uboot：
wget ftp://ftp.denx.de/pub/u-boot/u-boot-latest.tar.bz2
tar -xjf u-boot-latest.tar.bz2
cd u-boot-<version>
Building <= v1014.07: make tools-only
Building >= v1014.10: make sandbox_defconfig tools-only
#下面是安裝工具
sudo install tools/mkimage /usr/local/bin4.接下來就是下載內核鏡像並且編譯它：
#下載源碼
git clone git://github.com/beagleboard/kernel.git
cd kernel
git checkout 3.8
#下面是下載源碼包，可能需要很長的時間（與網速有關）
./patch.sh
#選擇配置文件
cp configs/beaglebone kernel/arch/arm/configs/beaglebone_defconfig
#下載固件
wget http://arago-project.org/git/projects/?p=am33x-cm3.git\;a=blob_plain\;f=bin/am335x-pm-firmware.bin\;hb=HEAD -O kernel/firmware/am335x-pm-firmware.bin
#進入源碼目錄
cd kernel
#可以編譯
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- beaglebone_defconfig
#編譯鏡像，需要幾分鐘的時間
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- zImage uImage dtbs
#
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage-dtb.am335x-boneblack
This step builds the kernel for the BBB
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules
到這裏就可以了，主要把生成的arch/arm/boot/zImage拷貝到BBB板子的原系統下的/boot/uboot/ 下替換掉原來的zImage，重啓後就進入了新的系統。
5.當然，除此之外也可以下載到內存中然後去執行，後先在
arch/arm/boot/uImage-dtb.am335x-boneblack拷貝到你的tftp的目錄，當然，爲了操作方便，可以給uImage-dtb.am335x-boneblack起個新的名字，這裏，將其拷貝成 uImage-BBB
接來下執行mkimage 檢測鏡像是否是正確的：
[user@sl61 tftpboot]$ mkimage -l uImage-BBB
Image Name: Linux-3.8.13-00650-g5506bfa
Created: Sun Jun 16 14:43:36 2013
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 4278313 Bytes = 4178.04 kB = 4.08 MB
Load Address: 80008000
Entry Point: 80008000
[user@sl61 tftpboot]$一切執行完畢，就可以通過uboot下載該鏡像，重啓BBB開發板，然後快速按下空格鍵進入uboot命令行模式，進入之後，執行：
setenv autoload no
#通過DHCP獲取ip地址
dhcp
#現在評估板應該就有一個正確的IP地址了，假如地址爲192.168.1.70，且假設tftp服務器地址爲 192.168.1.76執行：
setenv serverip 192.168.1.76
#通過tftp將鏡像下載到內存裏面
tftp 0x80200000 uImage-BBB
#設置啓動環境變量
setenv bootargs console=ttyO0,115200n8 quiet root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait
#啓動內核
bootm 0x80200000
下面是針對不同uboot的啓動界面：
U-Boot SPL 2013.04-dirty (May 20 2013 - 14:30:06)
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, SoftConn)
musb-hdrc: MHDRC RTL version 2.0
musb-hdrc: setup fifo_mode 4
musb-hdrc: 28/31 max ep, 16384/16384 memory
USB Peripheral mode controller at 47401000 using PIO, IRQ 0
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, SoftConn)
musb-hdrc: MHDRC RTL version 2.0
musb-hdrc: setup fifo_mode 4
musb-hdrc: 28/31 max ep, 16384/16384 memory
USB Host mode controller at 47401800 using PIO, IRQ 0
OMAP SD/MMC: 0
mmc_send_cmd : timeout: No status update
reading u-boot.img
reading u-boot.img
U-Boot 2013.04-dirty (May 20 2013 - 14:30:06)
I2C: ready
DRAM: 512 MiB
WARNING: Caches not enabled
NAND: No NAND device found!!!
0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
* Warning - readenv() failed, using default environment
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, SoftConn)
musb-hdrc: MHDRC RTL version 2.0
musb-hdrc: setup fifo_mode 4
musb-hdrc: 28/31 max ep, 16384/16384 memory
USB Peripheral mode controller at 47401000 using PIO, IRQ 0
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, SoftConn)
musb-hdrc: MHDRC RTL version 2.0
musb-hdrc: setup fifo_mode 4
musb-hdrc: 28/31 max ep, 16384/16384 memory
USB Host mode controller at 47401800 using PIO, IRQ 0
Net: not set. Validating first E-fuse MAC
cpsw, usb_ether
Hit any key to stop autoboot: 0
U-Boot#
U-Boot#
U-Boot# setenv autoload no
U-Boot# dhcp
link up on port 0, speed 100, full duplex
BOOTP broadcast 1
DHCP client bound to address 192.168.1.70
U-Boot# setenv serverip 192.168.1.76
U-Boot# tftp 0x80200000 uImage-BBB
link up on port 0, speed 100, full duplex
Using cpsw device
TFTP from server 192.168.1.76; our IP address is 192.168.1.70
Filename ‘uImage-BBB’.
Load address: 0x80200000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
################################
392.6 KiB/s
done
Bytes transferred = 4280457 (415089 hex)
U-Boot# setenv bootargs console=ttyO0,115200n8 quiet root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait
U-Boot# bootm 0x80200000
Booting kernel from Legacy Image at 80200000 …
Image Name: Linux-3.8.13-00650-gb0f8aff
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 4280393 Bytes = 4.1 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum … OK
Loading Kernel Image … OK
OK
Starting kernel …
Uncompressing Linux… done, booting the kernel.
[ 0.192647] omap2_mbox_probe: platform not supported
[ 0.203312] tps65217-bl tps65217-bl: no platform data provided
[ 0.280007] bone-capemgr bone_capemgr.8: slot #0: No cape found
[ 0.317116] bone-capemgr bone_capemgr.8: slot #1: No cape found
[ 0.354223] bone-capemgr bone_capemgr.8: slot #2: No cape found
[ 0.391333] bone-capemgr bone_capemgr.8: slot #3: No cape found
[ 0.411269] bone-capemgr bone_capemgr.8: slot #6: BB-BONELT-HDMIN conflict P8.4)
[ 0.420889] bone-capemgr bone_capemgr.8: slot #6: Failed verification
[ 0.427668] bone-capemgr bone_capemgr.8: loader: failed to load slot-6 BB-BONEL)
[ 0.450198] omap_hsmmc mmc.4: of_parse_phandle_with_args of ‘reset’ failed
[ 0.514871] pinctrl-single 44e10800.pinmux: pin 44e10854 already requested by 47
[ 0.526614] pinctrl-single 44e10800.pinmux: pin-21 (gpio-leds.7) status -22
[ 0.533928] pinctrl-single 44e10800.pinmux: could not request pin 21 on device e
[ 1.245582] systemd[1]: Failed to insert module ‘autofs4’
[ 1.504995] systemd[1]: Failed to open /dev/autofs: No such file or directory
[ 1.512556] systemd[1]: Failed to initialize automounter: No such file or direcy
[ 1.520702] systemd[1]: Failed to set up automount Arbitrary Executable File Fo.
[ 6.637581] libphy: PHY 4a101000.mdio:01 not found
[ 6.642639] net eth0: phy 4a101000.mdio:01 not found on slave 1
systemd-fsck[84]: Angstrom: clean, 50555/112672 files, 291538/449820 blocks
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The Angstrom Distribution beaglebone ttyO0
Angstrom v2012.12 - Kernel 3.8.13-00650-gb0f8aff
beaglebone login: