1、获取字符串长度
abc="huihuiuhiihu"
echo ${#abc}
利用#号实现字符串长度统计
2、截取字符串内容
${hui:5}
利用:加数字的形式截取固定长度字符串内容
3、实现固定长度字符串拼接
hui="sssdsdsdsjkdhskhdksd"
abc="12346"
kji=${abc}${hui:${#abc}}
echo $kji
1、获取字符串长度
abc="huihuiuhiihu"
echo ${#abc}
利用#号实现字符串长度统计
2、截取字符串内容
${hui:5}
利用:加数字的形式截取固定长度字符串内容
3、实现固定长度字符串拼接
hui="sssdsdsdsjkdhskhdksd"
abc="12346"
kji=${abc}${hui:${#abc}}
echo $kji
1、报错内容
openwrt mkimage: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory
2、解决方案
点击下载:http://security.ubuntu.com/ubuntu/pool/main/o/openssl1.0/
一、启动分析
uboot启动后会通过检测lx2160ardb_boot.scr配置文件,实现默认启动引导。此系列芯片引导方式一样。
打开./configs/board/lx2160ardb_rev2/manifest文件分析
vim ./configs/board/lx2160ardb_rev2/manifest
distroboot=\
'env exists dtb || setenv dtb fsl-lx2160a-rdb.dtb;'\
'env exists kernel_image || setenv kernel_image Image;'\
'env exists devpart_boot || setenv devpart_boot 2;'\
'env exists devpart_root || setenv devpart_root 4;'\
'part uuid $devtype $devnum:$devpart_root partuuidr;'\
'setenv bootargs console=ttyAMA0,115200 earlycon=pl011,mmio32,0x21c0000 root=PARTUUID=$partuuidr rw rootwait pci=pcie_bus_perf $othbootargs;'\
'load $devtype $devnum:$devpart_boot $kernel_addr_r $kernel_image;'\
'load $devtype $devnum:$devpart_boot $fdt_addr_r $dtb;'\
'env exists secureboot && echo validating secureboot && run secureboot_validate;'\
'booti $kernel_addr_r - $fdt_addr_r'
distroboot_ima=\
'env exists dtb || setenv dtb fsl-lx2160a-rdb.dtb;'\
'env exists kernel_image || setenv kernel_image Image;'\
'env exists devpart_boot || setenv devpart_boot 2;'\
'env exists devpart_root || setenv devpart_root 4;'\
'part uuid $devtype $devnum:$devpart_root partuuidr;'\
'load $devtype $devnum:$devpart_boot $kernel_addr_r $kernel_image;'\
'load $devtype $devnum:$devpart_boot $fdt_addr_r $dtb;'\
'setenv initramfs_addr_r 0xb0000000; setenv initramfsheader_addr_r 0x80300000;'\
'load $devtype $devnum:$devpart_boot $initramfs_addr_r initramfs.img;'\
'env exists secureboot && echo validating secureboot && run secureboot_validate;'\
'setenv bootargs console=ttyAMA0,115200 earlycon=pl011,mmio32,0x21c0000 root=PARTUUID=$partuuidr rw rootwait pci=pcie_bus_perf $othbootargs;'\
'booti $kernel_addr_r $initramfs_addr_r $fdt_addr_r'
通过分析配置文件,发现Linux和rootfs的引导取决于devpart_boot和devpart_root两个变量,所以通过修改这两个变量值,便可动态实现,分区引导切换。
二、手动引导切换
进入uboot命令行
setenv devpart_boot 2
setenv devpart_root 4
saveenv
2和4代表分区号
三、动态引导切换
如实现动态引导切换需要通过fw_env工具实现。请参照《fw-env开启文件系统设置uboot环境变量》http://www.recologypower.com:9080/?p=1247
四、分区处理
flex-installer -i pf -p 6P=200M:1536M:128M:13G:1536M:-1 -d /dev/sdx
五、烧录程序
usermod -a -G sudo xxxxx
1、进入uboot修改源码
vim include/configs/lx2160a_common.h
最后增加
/*Begin:add by zhaobaoxing for env*/
#define CONFIG_SYS_MMC_ENV_DEV 0
#define CONFIG_ENV_SIZE 0x2000 /* 8KB */
#define CONFIG_ENV_SECT_SIZE 0x20000
#define CONFIG_ENV_OFFSET 0x500000
#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
/*End:add by zhaobaoxing for env*/
2、修改fw_env.config文件
# Configuration file for fw_(printenv/setenv) utility.
# Up to two entries are valid, in this case the redundant
# environment sector is assumed present.
# Notice, that the "Number of sectors" is not required on NOR and SPI-dataflash.
# Futhermore, if the Flash sector size is omitted, this value is assumed to
# be the same as the Environment size, which is valid for NOR and SPI-dataflash
# Device offset must be prefixed with 0x to be parsed as a hexadecimal value.
# NOR example
# MTD device name Device offset Env. size Flash sector size Number of sectors
#/dev/mtd1 0x0000 0x4000 0x4000
#/dev/mtd2 0x0000 0x4000 0x4000
# MTD SPI-dataflash example
# MTD device name Device offset Env. size Flash sector size Number of sectors
#/dev/mtd5 0x4200 0x4200
#/dev/mtd6 0x4200 0x4200
# NAND example
#/dev/mtd0 0x4000 0x4000 0x20000 2
# On a block device a negative offset is treated as a backwards offset from the
# end of the device/partition, rather than a forwards offset from the start.
# Block device example
/dev/mmcblk0 0x500000 0x2000
#/dev/mmcblk0 -0x20000 0x20000
# VFAT example
#/boot/uboot.env 0x0000 0x4000
# UBI volume
#/dev/ubi0_0 0x0 0x1f000 0x1f000
#/dev/ubi0_1 0x0 0x1f000 0x1f000
# UBI volume by name
#/dev/ubi0:env 0x0 0x1f000 0x1f000
#/dev/ubi0:env-redund 0x0 0x1f000 0x1f000
~