如何备份Linux内核映像？
如何备份Linux内核映像？
提问于 2018-01-03 11:56:20
板与ARM926EJ CPU，运行嵌入式Linuxv2.6.26.5，在NAND设备上，NAND32MiB。Linux在NAND设备上的MTD分区上。
如何从串行接口备份Linux内核映像(SP2Xcybertan_rom_bin)？由于没有tftp选项，可以通过TFTP将文件从板传输到主机PC。我是否可以将nand读取到某个内存地址，将输出转储到终端并保存，然后将十六进制转换为二进制：
nand read 0x20000000 0x80000 0x0017FF80
md.b 0x20000000 0x0017FF80从引导进程日志：
U-Boot 2009.03 (Oct 06 2011 - 20:04:03)
Stack:->21F1EC74 U-Boot code: 21FC4D00->21FF9454 BSS:->21FFFF3B
CPU: PNX8181-2B OM6xxx-ARM926EJ-S(ARMv5TEJ) @ 221MHz(armclk), 110MHz(hclk)
Board: Vega_PNX8181_BaseStation Platform IV (LC)
I2C: ready
RAM Configuration:
Bank #0: 20000000 32 MB
NAND: 32 MiB
In: serial
Out: serial
Err: serial
Use Full Image's Kernel
Net: VLAN Mode
L2 switch present
ETN1
Hit any key to stop autoboot: 0
Loading from NAND 32MiB 3,3V 8-bit, offset 0x80000
Image Name: SP2Xcybertan_rom_bin
Created: 1970-01-01 0:00:-1 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1572736 Bytes = 1.5 MB
Load Address: 20008000
Entry Point: 20008000
## Booting kernel from Legacy Image at 20200000 ...
Image Name: SP2Xcybertan_rom_bin
Created: 1970-01-01 0:00:-1 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1572736 Bytes = 1.5 MB
Load Address: 20008000
Entry Point: 20008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux.........环境变量
firetux # printenv
baudrate=115200
ethaddr=FF:FF:FF:FF:FF:FF
netmask=255.255.255.0
ipaddr=192.168.1.1
serverip=192.168.1.100
bootfile=firetux.kernel
bootcmd1=setenv bootargs ${bootargs} && nboot 0x20200000 0 ${image_addr} && bootm 0x20200000
bootcmd2=setenv bootargs ${bootargs} && tftpboot 20200000 firetux.kernel && bootm 20200000
phymode=auto
mtdids=nand0=gen_nand
unlock=yes
verify=y
update.uboot=echo Update u-boot && tftpboot 0x20000000 nandboot.flash && nand erase 0x0 0x03ffff && nand write.jffs2 0x20000000 0x0 ${filesize}
update.kernel=echo Update kernel && tftpboot 0x20000000 uImage && nand erase 0x80000 0x180000 && nand write.jffs2 20000000 0x80000 0x180000
update.romimg=echo Update RomImage && tftpboot 0x20000000 romimage.img && nand erase 0x80000 0x13e0000&& nand write.jffs2 20000000 0x80000 ${filesize}
update.halfimg=echo Update HalfImage && tftpboot 0x20000000 recovery.img && nand erase 0x1460000 0x700000&& nand write.jffs2 20000000 0x1460000 ${filesize}
eraseenv=echo Erase Environment && nand erase 0x60000 0x20000
HwModel=Hw_Model=SPA122
bootcmd=run bootcmd1
halfImage=half_image=0
cy_boot_code_ver=1.0.1 (Oct 6 2011 - 20:04:00)
RouterMode=Router_Mode=0
stdin=serial
stdout=serial
stderr=serial
bootcmd=run bootcmd1
image_addr=0x80000
bootargs=console=ttyS1,115200n8 rootfstype=squashfs noalign half_image=0 verify=y Hw_Model=SPA122 Router_Mode=0
ethact=ETN1
bootdelay=3 内核(UImage)和romimage (romimg.img)在引导过程方面有什么不同？
回答 1
Unix & Linux用户
回答已采纳
发布于 2018-01-04 01:44:05
这样做的步骤如下：
首先，假设更新uImage是正确的
update.kernel=echo Update kernel && tftpboot 0x20000000 uImage && nand erase 0x80000 0x180000 && nand write.jffs2 20000000 0x80000 0x180000
然后：
nand read
md 因此：
nand read 0x20000000 0x80000 0x180000
md 0x20000000 0x180000然后，您需要找到一种方法，将输入记录在串行上，并使用脚本解析输入，以获取十六进制字节并将它们以二进制形式输出到文件中。
页面原文内容由Unix & Linux提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://unix.stackexchange.com/questions/414511
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