我现在内核版本为4.4是可以起来的，内核版本更换成4.19版本后启动会遇到好不到磁盘的情况！
日志内容如下：
Begin: Mounting root file system … Begin: Running /scripts/local-top … done.
wait-for-root /dev/block/mtd/by-name/system, retry 2…
wait-for-root /dev/block/mtd/by-name/system, retry 3…
wait-for-root /dev/block/mtd/by-name/system, retry 4…
wait-for-root /dev/block/mtd/by-name/system, retry 5…
wait-for-root /dev/block/mtd/by-name/system, retry 6…
wait-for-root /dev/block/mtd/by-name/system, retry 7…
wait-for-root /dev/block/mtd/by-name/system, retry 8…
wait-for-root /dev/block/mtd/by-name/system, retry 9…
wait-for-root /dev/block/mtd/by-name/system, retry 10…
wait-for-root /dev/block/mtd/by-name/system, retry 11…
wait-for-root /dev/block/mtd/by-name/system, retry 12…
wait-for-root /dev/block/mtd/by-name/system, retry 13…
wait-for-root /dev/block/mtd/by-name/system, retry 14…
wait-for-root /dev/block/mtd/by-name/system, retry 15…
wait-for-root /dev/block/mtd/by-name/system, retry 16…
wait-for-root /dev/block/mtd/by-name/system, retry 17…
wait-for-root /dev/block/mtd/by-name/system, retry 18…
wait-for-root /dev/block/mtd/by-name/system, retry 19…
wait-for-root /dev/block/mtd/by-name/system, retry 20…
wait-for-root /dev/block/mtd/by-name/system, retry 21…
wait-for-root /dev/block/mtd/by-name/system, retry 22…
wait-for-root /dev/block/mtd/by-name/system, retry 23…
wait-for-root /dev/block/mtd/by-name/system, retry 24…
wait-for-root /dev/block/mtd/by-name/system, retry 25…
wait-for-root /dev/block/mtd/by-name/system, retry 26…
wait-for-root /dev/block/mtd/by-name/system, retry 27…
wait-for-root /dev/block/mtd/by-name/system, retry 28…
wait-for-root /dev/block/mtd/by-name/system, retry 29…
wait-for-root /dev/block/mtd/by-name/system, retry 30…
[ 31.836002] vcc_sd: disabling
Gave up waiting for root device. Common problems:
- Boot args (cat /proc/cmdline)
- Check rootdelay= (did the system wait long enough?)
- Check root= (did the system wait for the right device?)
- Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/block/mtd/by-name/system does not exist. Dropping to a shell!
我按照牛头版主的帖子中的方法：Firefly Ubuntu开发入门之（4）打包Ubuntu镜像
更换为 /dev/mmcblk0p3 等等，也还是不可以，后来我使用 ls /dev/mm* 命令，发现在dev下根本没有mm开头的任何字符设备，请问有没有大神知道如何把RK3288的内核升级为4.19版本