RAMDISK: EOF while reading compressed data

b302 65536 mmcblk0p2 00000000-02

b303 262144 mmcblk0p3 00000000-03

b308 7634944 mmcblk1
driver: mmcblk
b309 40960 mmcblk1p1 00000000-01

b30a 32768 mmcblk1p2 00000000-02

b320 4096 mmcblk1rpmb
(driver?)
b318 32640 mmcblk1boot1
(driver?)
b310 32640 mmcblk1boot0
(driver?)
No filesystem could mount root, tried:
ext4

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
CPU0: stopping
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.140-xilinx-v2018.2 #8
Hardware name: Xilinx Zynq Platform
[] (unwind_backtrace) from [] (show_stack+0x10/0x14)
[] (show_stack) from [] (dump_stack+0xa8/0xc8)
[] (dump_stack) from [] (handle_IPI+0xd8/0x1a0)
[] (handle_IPI) from [] (gic_handle_irq+0x84/0x90)
[] (gic_handle_irq) from [] (__irq_svc+0x6c/0xa8)
Exception stack(0xc0a01f18 to 0xc0a01f60)
1f00: 00000000 00000000
1f20: 2ef8a000 00000000 ef8d0340 c0a30c28 ef8d0340 00000000 568e15db 56faa8a5
1f40: 00000000 00000000 fffffff5 c0a01f68 c04d3e54 c04d3e7c 60000013 ffffffff
[] (__irq_svc) from [] (cpuidle_enter_state+0xf8/0x1d4)
[] (cpuidle_enter_state) from [] (do_idle+0x148/0x1a8)
[] (do_idle) from [] (cpu_startup_entry+0x18/0x1c)
[] (cpu_startup_entry) from [] (start_kernel+0x300/0x360)
[] (start_kernel) from [<0800807c>] (0x800807c)
—[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
##########
setenv rootfs_img rootfs.ext4.bz2
setenv sd_bootramargs ‘$consoleinitrd=${rootfs_addr},${rootfs_size} root=/dev/ram0 rw rootwait rootfstype=ext4’

setenv rootfs_size 0x4000000
setenv rootfs_addr 0x10000000

最终发现是因为kernel 进行解析 rootfs.ext4.bz2 压缩文件时，会去0x10000000 地址按照 0x4000000大小进行解压加载，但是我的rootfs.ext4.bz2 文件只有 9M 左右，解析时也会解析超过9M的空间内容(因为0x4000000 是64M)。在超过9M空间内数据是乱码的，所以会读取到无法控制的数据，例如EOF结束符号。就认为出现异常。导致ramfs启动失败。

解决方式1：
rootfs_size 按照实际rootfs.ext4.bz2 文件大小进行设置。
这样每次启动就要手动或者自动获取rootfs.ext4.bz2大小给环境变量。麻烦
解决方式2：
在加载 rootfs.ext4.bz2 文件之前先清除ram的空间。
mw.b ${rootfs_addr} 0 ${rootfs_size}
修改如下:
添加环境变量
step1: fatload mmc $s{d}_{d}e{v}_{b}oot:${sd_part_boot} ${kernel_addr} ${kernel_image};
step2: fatload mmc $s{d}_{d}e{v}_{b}oot:${sd_part_boot} ${bootdtb_addr} ${devicetree_image};
step3: sd_load_rootfs=mw.b ${rootfs_addr} 0 ${rootfs_size}; fatload mmc $s{d}_{d}e{v}_{b}oot:${sd_part_boot} ${rootfs_addr} $rootf{s}_{i}mg;step4:setenvbootarg{s}^{\prime }${console} initrd=$rootf{s}_{a}ddr,${rootfs_size} root=/dev/ram0 rw rootwait rootfstype=ext4’

我这边使用fatload 加载镜像