前幾天編譯uboot時遇到一些問題，先記錄一下，linux嵌入式開發還是蠻意思的，要想玩的溜，就必須掌握最基本的uboot、kernel移植、適配、裁剪。

二 編譯uboot

2.1 解壓uboot源碼以及交叉編譯器到root目錄

cd ~
tar xvf bb-black-debian-u-boot.tar.bz2
tar xf gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux.tar.xz

2.2 安裝交叉編譯器

gedit /etc/profile

在最后一行加入環境變量

export PATH=$PATH:~/gcc-linaro-arm-linux-gnueabihf-4.8-2014.03_linux/bin/

使配置生效

source /etc/profile

2.3 查看版本

arm-linux-gnueabihf-gcc -v

這里會報錯

bash: /...-gcc: No such file or directory

沒人任何提示信息，讓人摸不著頭腦，搜索這個問題，發現是少了庫，于是

apt-get install lib32z1

又報錯了

error while loading shared libraries: 
libstdc++.so.6: cannot open shared object file:
 No such file or directory

這次報錯倒是有提示信息，這樣就簡單了，安裝缺少的庫就可以了

apt-get install libstdc++6
apt-get install lib32stdc++6

2.4 編譯uboot

cd ~
cd u-boot
make ARCH=arm CROSS_COMPILE=${CC} distclean //清理
make ARCH=arm CROSS_COMPILE=${CC} am335x_evm_config //配置
make ARCH=arm CROSS_COMPILE=${CC} //編譯輸

編譯成功

2.5 燒錄測試

2.5.1 接上串口線

2.5.2 復制鏡像文件到SD卡，從SD卡啟動，log如下:

U-Boot 2014.04-rc3 (Aug 17 2022 - 20:55:03)
I2C:   ready
DRAM:  512 MiB
NAND:  0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
*** Warning - readenv() failed, using default environment
Net:    ethaddr > not set. Validating first E-fuse MAC
cpsw, usb_ether
Warning: Your board does not use generic board. Please read
doc/README.generic-board and take action. Boards not
upgraded by the late 2014 may break or be removed.
Hit any key to stop autoboot:  0 
U-Boot# 
U-Boot# version 


U-Boot 2014.04-rc3 (Aug 17 2022 - 20:55:03)
arm-linux-gnueabihf-gcc (crosstool-NG linaro-1.13.1-4.8-2014.03 - Linaro GCC 2014.03) 4.8.3 20140303 (prerelease)
GNU ld (crosstool-NG linaro-1.13.1-4.8-2014.03 - Linaro GCC 2014.03) 2.24.0.20140311 Linaro 2014.03
U-Boot#