3 -- Xintang nuc980 kernel supports JFFS2, JFFS2 file system production, kernel mount JFFS2, uboot network port settings, and uboot supports TFTP

Contents of this article
1.uboot Network port setting
2. Kernel creation MTD Partition ,Jffs2 File system production
3. The kernel support jffs2
4. Kernel mount jffs2

 First support spi nor flash 
https://blog.csdn.net/qq_43145360/article/details/125520066?spm=1001.2014.3001.5502

1.uboot Network port setting

 Print the file path that needs to be modified for the space problem , I'll meet you later 
//Net:
board_r.c  659

// modify nuc980 emac 
drivers/net/nuc980_eth.c 255

Final effect ：

1） modify include/configs/nuc980_evb.h
Modified into ：

2） modify include/env_default.h
default_enviroment Newly added CONFIG_ETHADDR

3) modify uboot Configure and support network ports
open network device support


modify Command line interface
->Network commands
Remove the first three , Otherwise, it can't be used tftp. Support ping

4） Compile and download
Print out env

Use the network cable to make the board and the computer in the same network segment , open tftp Tools , Use tftp Download the kernel image

 tftp 0xa0000 980uimage
 run bootcmd

2. Kernel creation MTD Partition ,Jffs2 File system production

Kernel creation MTD Partition reference article

https://blog.csdn.net/qq_43145360/article/details/125573572?spm=1001.2014.3001.5502

Effect after kernel startup ：

Busybox Making root file system can refer to the article

 Reference article 
https://blog.csdn.net/weixin_38387929/article/details/108538631?spm=1001.2014.3001.5506

Need to use mtd-util Of mkfs.jffs2 and rootfs/ Generate rootfs.jffs2

Make jffs2 Mirror can refer to the article

https://blog.csdn.net/itismine/article/details/4775824?spm=1001.2014.3001.5506

After compilation, it can be started in /dev/ram0 Within the Division cramfs Format of the file system
Generated rootfs.jff2 Put it in rootfs/tmp/ in , Program into the kernel image

3. The kernel support jffs2

File  systems  --->
    Miscellaneous  filesystems  --->
        <*>  YAFFS2  file  system  support
        [*]  Autoselect  yaffs2  format


 Configure language options 

Native  Language  support  --->
    (iso8859-1)  Default  NLS  Option
    <*>  Codepage  437(United  States,  Canada)
    <*>  Simplified  Chinese  charset(CP936,  GB2312)
    <*>  NLS  ISO8859-1  (Latin  1;  Western  European  Language)
    <*>  NLS  UTF-8

4. Kernel mount jffs2

Use uboot After booting the kernel , Get into tmp in ,
Use dd Command generation is all ff Of , Size and mtdblock2 Same file , Also on the tmp in , Program into kernel ,
Reference article

https://www.jianshu.com/p/398fb66d06b2

 Using redirection cat  erase mtdblock2 Partition 
cat fftxt > /dev/mtdblock2
 Use cat  take rootfs.jff2 write in mtdblock2 Partition 
cat rootfs.jffs2 > /dev/mtdblock2
mount -a
mdev -s
 notice proc After there is a device under the folder 
 Use mount  mount /dev/block2 Partition 
mount -t jffs2 /dev/mtdblock2 /mnt
cd /mnt
ls
 You can see the mounted file system 

It has been debugged to this , About cramfs and jffs2, I think this is to start a small file system first （ram）, Go in and then mount mount

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