cmdline.txt

zswap.enabled=1 zswap.compressor=lz4 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/sda2 rootfstype=btrfs rootflags=ssd,compress=lz4 elevator=deadline fsck.repair=yes rootdelay=15 debug

raspbian-sda2.log

[    9.033438] usb 1-1.5.1: new high-speed USB device number 5 using dwc_otg
[    9.165238] usb 1-1.5.1: New USB device found, idVendor=174c, idProduct=55aa
[    9.178190] usb 1-1.5.1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[    9.191498] usb 1-1.5.1: Product: ASM1153E
[    9.201410] usb 1-1.5.1: Manufacturer: Inateck
[    9.211666] usb 1-1.5.1: SerialNumber: 123456789111
[    9.223291] usb-storage 1-1.5.1:1.0: USB Mass Storage device detected
[    9.236116] usb-storage 1-1.5.1:1.0: Quirks match for vid 174c pid 55aa: 400000
[    9.249463] scsi host0: usb-storage 1-1.5.1:1.0
[   10.254365] scsi 0:0:0:0: Direct-Access     Inateck  ASM1153E         0    PQ: 0 ANSI: 6
[   10.273841] sd 0:0:0:0: [sda] 468862128 512-byte logical blocks: (240 GB/223 GiB)
[   10.288056] sd 0:0:0:0: [sda] Write Protect is off
[   10.298852] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
[   10.310392] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   10.328441]  sda: sda1 sda2
[   10.340128] sd 0:0:0:0: [sda] Attached SCSI disk
[   17.274537] VFS: Cannot open root device "sda2" or unknown-block(8,2): error -19
[   17.288111] Please append a correct "root=" boot option; here are the available partitions:
[   17.302593] 0100            4096 ram0  (driver?)
[   17.313343] 0101            4096 ram1  (driver?)
[   17.324085] 0102            4096 ram2  (driver?)
[   17.334804] 0103            4096 ram3  (driver?)
[   17.345485] 0104            4096 ram4  (driver?)
[   17.356120] 0105            4096 ram5  (driver?)
[   17.366764] 0106            4096 ram6  (driver?)
[   17.377310] 0107            4096 ram7  (driver?)
[   17.387792] 0108            4096 ram8  (driver?)
[   17.398219] 0109            4096 ram9  (driver?)
[   17.408584] 010a            4096 ram10  (driver?)
[   17.418998] 010b            4096 ram11  (driver?)
[   17.429352] 010c            4096 ram12  (driver?)
[   17.439646] 010d            4096 ram13  (driver?)
[   17.449916] 010e            4096 ram14  (driver?)
[   17.460127] 010f            4096 ram15  (driver?)
[   17.470283] b300        31276032 mmcblk0  driver: mmcblk
[   17.481035]   b301         8388608 mmcblk0p1 ba2edfb9-01
[   17.491794]   b302        12582912 mmcblk0p2 ba2edfb9-02
[   17.502513] 0800       234431064 sda  driver: sd
[   17.512502]   0801        12582720 sda1 627fe487-01
[   17.522753]   0802       150992640 sda2 627fe487-02
[   17.532978] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,2)