Stop booting in RK3188

[dcostan]

Hello all
I have a chinese board with RK3188 and I tried to build and use this kernel with Radxa Rock device tree. Unfortunately the boot process stops after a few seconds and it doesn't go on. Here is the serial

DDR Version 1.04 20140217
In
DDR3
300MHz
Bus Width=32 Col=10 Bank=8 Row=16 CS=1 Die Bus-Width=8 Size=2048MB
Memory OK
OUT


barebox 2016.02.0 #18 Sat Mar 5 09:20:35 CET 2016


Board: Radxa Rock
clk_register clk xin24m is already registered, skipping!

of_clk_init: failed to init clock for /oscillator: 1

arc-emac 10204000.ethernet: ARC EMAC detected with id: 0x7fd02
mdio_bus: miibus0: probed
dw_mmc 10214000.dwmmc: registered as 10214000.dwmmc
mshc1: detected SD card version 1.0
mshc1: registered mshc1
netconsole: registered as netconsole-1
i2c-gpio i2c-gpio0: using pins 58 (SDA) and 59 (SCL)
malloc space: 0x9ff7d800 -> 0xdfefafff (size 1023.5 MiB)
envfs: wrong magic
running /env/bin/init...

Hit any key to stop autoboot:  3 2 1 0
blspec: blspec_scan_directory: /mnt/mshc1.0 loader/entries
ext4 ext40: EXT2 rev 1, inode_size 256
blspec: blspec_scan_directory: /mnt/mshc1.1 loader/entries
blspec: blspec_scan_directory: mshc1 loader/entries
blspec: booting Debian
 from mshc1

Loading ARM Linux zImage '/mnt/mshc1.0/rk3188-radxarock.img.neww
'
Loading devicetree from '/mnt/mshc1.0/rk3188-radxarock.dtb.neww
'
commandline:  console=ttyS2,115200 console=tty0 console=ttyS2,115200 root=/dev/mmcblk0p2 rootdelay=3 rootfstype=ext4 rw clocksource=jiffies earlyprintk debug
  
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 4.4.143 (matlin@matlin-PC) (gcc version 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701] (Linaro GCC 7.3-2018.05) ) #5 SMP Wed Aug 8 15:48:09 CEST 2018
[    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine model: Radxa Rock
[    0.000000] cma: Reserved 16 MiB at 0xdf000000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] On node 0 totalpages: 524288
[    0.000000] free_area_init_node: node 0, pgdat c10d5bc0, node_mem_map eeffa000
[    0.000000]   Normal zone: 1536 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 196608 pages, LIFO batch:31
[    0.000000]   HighMem zone: 327680 pages, LIFO batch:31
[    0.000000] PERCPU: Embedded 14 pages/cpu @eef9d000 s24728 r8192 d24424 u57344
[    0.000000] pcpu-alloc: s24728 r8192 d24424 u57344 alloc=14*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 522752
[    0.000000] Kernel command line:  console=ttyS2,115200 console=tty0 console=ttyS2,115200 root=/dev/mmcblk0p2 rootdelay=3 rootfstype=ext4 rw clocksource=jiffies earlyprintk debug
  
[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 2046320K/2097152K available (10240K kernel code, 892K rwdata, 2912K rodata, 1024K init, 582K bss, 34448K reserved, 16384K cma-reserved, 1294336K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0xf0800000 - 0xff800000   ( 240 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xf0000000   ( 768 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0008000 - 0xc0b00000   (11232 kB)
[    0.000000]       .init : 0xc0f00000 - 0xc1000000   (1024 kB)
[    0.000000]       .data : 0xc1000000 - 0xc10df274   ( 893 kB)
[    0.000000]        .bss : 0xc10e1000 - 0xc11729f0   ( 583 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] 	Build-time adjustment of leaf fanout to 32.
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000022] sched_clock: 64 bits at 150MHz, resolution 6ns, wraps every 2199023255551ns
[    0.000059] clocksource: arm_global_timer: mask: 0xffffffffffffffff max_cycles: 0x2298375bd0, max_idle_ns: 440795208267 ns
[    0.001765] Console: colour dummy device 80x30
[    0.003095] console [tty0] enabled
[    0.003167] Calibrating delay loop... 1196.85 BogoMIPS (lpj=5984256)
[    0.090372] pid_max: default: 32768 minimum: 301
[    0.090580] Security Framework initialized
[    0.090638] Yama: becoming mindful.
[    0.090779] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.090850] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.092316] Initializing cgroup subsys devices
[    0.092414] Initializing cgroup subsys freezer
[    0.092522] CPU: Testing write buffer coherency: ok
[    0.092631] ftrace: allocating 39052 entries in 115 pages
[    0.199862] CPU0: update cpu_capacity 1024
[    0.199935] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.200122] Setting up static identity map for 0x60100000 - 0x60100058
[    0.207781] Brought up 1 CPUs
[    0.207854] SMP: Total of 1 processors activated (1196.85 BogoMIPS).
[    0.207892] CPU: All CPU(s) started in SVC mode.
[    0.209480] devtmpfs: initialized
[    0.221134] VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
[    0.222135] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.222263] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.225293] pinctrl core: initialized pinctrl subsystem
[    0.227488] NET: Registered protocol family 16
[    0.230080] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.232789] cpuidle: using governor ladder
[    0.232881] cpuidle: using governor menu
[    0.232961] Registered FIQ tty driver
[    0.245192] gpiochip_add_data: registered GPIOs 0 to 31 on device: gpio0
[    0.245475] gpiochip_add_data: registered GPIOs 32 to 63 on device: gpio1
[    0.245771] gpiochip_add_data: registered GPIOs 64 to 95 on device: gpio2
[    0.246032] gpiochip_add_data: registered GPIOs 96 to 127 on device: gpio3
[    0.252526] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
[    0.252613] hw-breakpoint: maximum watchpoint size is 4 bytes.
[    0.281170] of_get_named_gpiod_flags: parsed 'gpio' property of node '/usb-otg-regulator[0]' - status (0)
[    0.282054] of_get_named_gpiod_flags: parsed 'gpio' property of node '/sdmmc-regulator[0]' - status (0)
[    0.282638] sdmmc-supply: regulator get failed, ret=-517
[    0.283040] of_get_named_gpiod_flags: parsed 'gpio' property of node '/usb-host-regulator[0]' - status (0)
[    0.283881] of_get_named_gpiod_flags: can't parse 'gpio' property of node '/vsys-regulator[0]'
[    0.286148] SCSI subsystem initialized
[    0.286843] usbcore: registered new interface driver usbfs
[    0.287040] usbcore: registered new interface driver hub
[    0.287520] usbcore: registered new device driver usb
[    0.287900] media: Linux media interface: v0.10
[    0.288051] Linux video capture interface: v2.00
[    0.288185] pps_core: LinuxPPS API ver. 1 registered
[    0.288229] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.288336] PTP clock support registered
[    0.290236] Advanced Linux Sound Architecture Driver Initialized.
[    0.291691] Bluetooth: Core ver 2.21
[    0.291837] NET: Registered protocol family 31
[    0.291886] Bluetooth: HCI device and connection manager initialized
[    0.291944] Bluetooth: HCI socket layer initialized
[    0.291996] Bluetooth: L2CAP socket layer initialized
[    0.292101] Bluetooth: SCO socket layer initialized
[    0.409955] NET: Registered protocol family 2
[    0.411335] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.411559] TCP bind hash table entries: 8192 (order: 5, 163840 bytes)
[    0.411986] TCP: Hash tables configured (established 8192 bind 8192)
[    0.412180] UDP hash table entries: 512 (order: 2, 24576 bytes)
[    0.412291] UDP-Lite hash table entries: 512 (order: 2, 24576 bytes)
[    0.412782] NET: Registered protocol family 1
[    0.413701] RPC: Registered named UNIX socket transport module.
[    0.413772] RPC: Registered udp transport module.
[    0.413807] RPC: Registered tcp transport module.
[    0.413840] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.418556] Initialise system trusted keyring
[    0.437475] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.441768] NFS: Registering the id_resolver key type
[    0.441881] Key type id_resolver registered
[    0.441926] Key type id_legacy registered
[    0.442012] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[    0.443344] fuse init (API version 7.23)
[    0.455285] jitterentropy: Initialization failed with host not compliant with requirements: 2
[    0.455820] NET: Registered protocol family 38
[    0.455945] Key type asymmetric registered
[    0.456010] Asymmetric key parser 'x509' registered
[    0.456196] bounce: pool size: 64 pages
[    0.456639] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247)
[    0.456753] io scheduler noop registered
[    0.456813] io scheduler deadline registered
[    0.456941] io scheduler cfq registered (default)
[    0.465623] dma-pl330 20018000.dma-controller: Loaded driver for PL330 DMAC-241330
[    0.465721] dma-pl330 20018000.dma-controller: 	DBUFF-32x8bytes Num_Chans-6 Num_Peri-12 Num_Events-12
[    0.470158] dma-pl330 20078000.dma-controller: Loaded driver for PL330 DMAC-241330
[    0.470253] dma-pl330 20078000.dma-controller: 	DBUFF-64x8bytes Num_Chans-7 Num_Peri-20 Num_Events-14
[    0.472143] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.475742] 10124000.serial: ttyS0 at MMIO 0x10124000 (irq = 22, base_baud = 1500000) is a 16550A
[    0.477354] 10126000.serial: ttyS1 at MMIO 0x10126000 (irq = 23, base_baud = 1500000) is a 16550A
[    0.479018] console [ttyS2] disabled
[    0.479205] 20064000.serial: ttyS2 at MMIO 0x20064000 (irq = 30, base_baud = 1500000) is a 16550A
[    1.373506] console [ttyS2] enabled
[    1.378975] 20068000.serial: ttyS3 at MMIO 0x20068000 (irq = 31, base_baud = 1500000) is a 16550A
[    1.391560] [drm] Initialized drm 1.1.0 20060810
[    1.399586] usbcore: registered new interface driver udl
[    1.409777] brd: module loaded
[    1.428425] loop: module loaded
[    1.433928] zram: Added device: zram0
[    1.438175] lkdtm: No crash points registered, enable through debugfs
[    1.446961] tun: Universal TUN/TAP device driver, 1.6
[    1.452791] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>

In addition mainline kernel from Torvalds boots, however it does not contain board specific drivers
Thank you all

[peppelinux]

Got it to work here:
https://github.com/peppelinux/Radxa-Rock-RK3188/blob/master/README.md

now I'm compiling rockchip-linux 4.4 instead of linux-stable 5.8.7, further updates on that repository.
Don't know why you're encourring in that, I've added init= parameter in boot arguments, I can see systemd starting properly

[peppelinux]

Got this

Loading ARM Linux zImage '/mnt/mshc1.0/zImage'
zImage: concatenated oftree detected
commandline: <NULL>
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 4.4.194 (root@peppelinux-desktop) (gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu1) ) #1 SMP PREEMPT Mon Sep 21 14:29:25 CEST 2020
[    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine model: Radxa Rock
[    0.000000] cma: Reserved 16 MiB at 0xdf000000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] PERCPU: Embedded 13 pages/cpu @eeda7000 s23948 r8192 d21108 u53248
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 522560
[    0.000000] Kernel command line: console=ttyS2,115200  root=/dev/mmcblk0p2 rootwait init=/init
[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 2041400K/2097152K available (10240K kernel code, 1193K rwdata, 4160K rodata, 1024K init, 2163K bss, 39368K reserved, 16384K cma-reserved, 1294336K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0xf0800000 - 0xff800000   ( 240 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xf0000000   ( 768 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0008000 - 0xc0b00000   (11232 kB)
[    0.000000]       .init : 0xc1000000 - 0xc1100000   (1024 kB)
[    0.000000]       .data : 0xc1100000 - 0xc122a458   (1194 kB)
[    0.000000]        .bss : 0xc122c000 - 0xc1448da4   (2164 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] 	Build-time adjustment of leaf fanout to 32.
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000021] sched_clock: 64 bits at 150MHz, resolution 6ns, wraps every 2199023255551ns
[    0.000056] clocksource: arm_global_timer: mask: 0xffffffffffffffff max_cycles: 0x2298375bd0, max_idle_ns: 440795208267 ns
[    0.001227] Calibrating delay loop... 1194.16 BogoMIPS (lpj=1990656)
[    0.040248] pid_max: default: 32768 minimum: 301
[    0.040370] Security Framework initialized
[    0.040391] SELinux:  Initializing.
[    0.040531] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.040556] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.041729] Initializing cgroup subsys memory
[    0.041791] Initializing cgroup subsys freezer
[    0.041889] CPU: Testing write buffer coherency: ok
[    0.042531] CPU0: update cpu_capacity 1024
[    0.042556] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.042684] Setting up static identity map for 0x60100000 - 0x60100058
[    0.090418] Brought up 1 CPUs
[    0.090445] SMP: Total of 1 processors activated (1194.16 BogoMIPS).
[    0.090457] CPU: All CPU(s) started in SVC mode.
[    0.092163] devtmpfs: initialized
[    0.104126] VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
[    0.105136] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6370867519511994 ns
[    0.105193] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.108924] pinctrl core: initialized pinctrl subsystem
[    0.110968] NET: Registered protocol family 16
[    0.113069] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.133638] cpuidle: using governor ladder
[    0.160299] cpuidle: using governor menu
[    0.160392] Registered FIQ tty driver
[    0.177995] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
[    0.178018] hw-breakpoint: maximum watchpoint size is 4 bytes.
[    0.262724] sdmmc-supply: regulator get failed, ret=-517
[    0.265499] SCSI subsystem initialized
[    0.266017] usbcore: registered new interface driver usbfs
[    0.266142] usbcore: registered new interface driver hub
[    0.266549] usbcore: registered new device driver usb
[    0.267982] media: Linux media interface: v0.10
[    0.268091] Linux video capture interface: v2.00
[    0.268565] pps_core: LinuxPPS API ver. 1 registered
[    0.268585] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.268661] PTP clock support registered
[    0.271449] Advanced Linux Sound Architecture Driver Initialized.
[    0.272526] Bluetooth: Core ver 2.21
[    0.272644] NET: Registered protocol family 31
[    0.272661] Bluetooth: HCI device and connection manager initialized
[    0.272690] Bluetooth: HCI socket layer initialized
[    0.272713] Bluetooth: L2CAP socket layer initialized
[    0.272807] Bluetooth: SCO socket layer initialized
[    0.278582] clocksource: Switched to clocksource arm_global_timer
[    0.387797] rga: Module initialized.
[    0.392026] NET: Registered protocol family 2
[    0.393152] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.393271] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.393445] TCP: Hash tables configured (established 8192 bind 8192)
[    0.393693] UDP hash table entries: 512 (order: 2, 16384 bytes)
[    0.393769] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[    0.394184] NET: Registered protocol family 1
[    0.405481] audit: initializing netlink subsys (disabled)
[    0.405581] audit: type=2000 audit(0.400:1): initialized
[    0.427734] VFS: Disk quotas dquot_6.6.0
[    0.428009] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.430092] Registering sdcardfs 0.1
[    0.430694] fuse init (API version 7.23)
[    0.433940] 
[    0.433940] TEE Core Framework initialization (ver 1:0.1)
[    0.434015] tee: kernel is running in secure mode, tee service unavailable.
[    0.450922] bounce: pool size: 64 pages
[    0.451230] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247)
[    0.451277] io scheduler noop registered
[    0.451305] io scheduler deadline registered
[    0.451546] io scheduler cfq registered (default)
[    0.457708] Module initialized.
[    0.460748] dma-pl330 20018000.dma-controller: Loaded driver for PL330 DMAC-241330
[    0.460778] dma-pl330 20018000.dma-controller: 	DBUFF-32x8bytes Num_Chans-6 Num_Peri-12 Num_Events-12
[    0.464709] dma-pl330 20078000.dma-controller: Loaded driver for PL330 DMAC-241330
[    0.464741] dma-pl330 20078000.dma-controller: 	DBUFF-64x8bytes Num_Chans-7 Num_Peri-20 Num_Events-14
[    0.467228] Serial: 8250/16550 driver, 5 ports, IRQ sharing disabled
[    0.468129] 10124000.serial: ttyS0 at MMIO 0x10124000 (irq = 22, base_baud = 1500000) is a 16550A
[    0.469191] 10126000.serial: ttyS1 at MMIO 0x10126000 (irq = 23, base_baud = 1500000) is a 16550A
[    0.470463] 20064000.serial: ttyS2 at MMIO 0x20064000 (irq = 30, base_baud = 1500000) is a 16550A
[    1.111879] console [ttyS2] enabled
[    1.116391] 20068000.serial: ttyS3 at MMIO 0x20068000 (irq = 31, base_baud = 1500000) is a 16550A
[    1.126887] [drm] Initialized drm 1.1.0 20060810
[    1.264404] brd: module loaded
[    1.321438] loop: module loaded
[    1.331333] zram: Added device: zram0
[    1.341211] SCSI Media Changer driver v0.25 
[    1.346423] tun: Universal TUN/TAP device driver, 1.6
[    1.351558] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
[    1.358792] PPP generic driver version 2.4.2
[    1.363772] PPP BSD Compression module registered
[    1.368655] PPP Deflate Compression module registered
[    1.373817] PPP MPPE Compression module registered
[    1.378782] NET: Registered protocol family 24
[    1.383390] SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256) (6 bit encapsulation enabled).
[    1.393168] CSLIP: code copyright 1989 Regents of the University of California.
[    1.400571] Rockchip WiFi SYS interface (V1.00) ... 
[    1.405899] usbcore: registered new interface driver catc
[    1.411535] usbcore: registered new interface driver kaweth
[    1.417198] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver
[    1.424771] usbcore: registered new interface driver pegasus
[    1.430646] usbcore: registered new interface driver rtl8150
[    1.436519] usbcore: registered new interface driver r8152
[    1.442091] hso: drivers/net/usb/hso.c: Option Wireless
[    1.447557] usbcore: registered new interface driver hso
[    1.453083] usbcore: registered new interface driver asix
[    1.458699] usbcore: registered new interface driver ax88179_178a
[    1.465005] usbcore: registered new interface driver cdc_ether
[    1.471049] usbcore: registered new interface driver cdc_eem
[    1.476986] usbcore: registered new interface driver dm9601
[    1.482788] usbcore: registered new interface driver smsc75xx
[    1.488778] usbcore: registered new interface driver smsc95xx
[    1.494747] usbcore: registered new interface driver gl620a
[    1.500536] usbcore: registered new interface driver net1080
[    1.506405] usbcore: registered new interface driver plusb
[    1.512104] usbcore: registered new interface driver rndis_host
[    1.518229] usbcore: registered new interface driver cdc_subset
[    1.524357] usbcore: registered new interface driver zaurus
[    1.530146] usbcore: registered new interface driver MOSCHIP usb-ethernet driver
[    1.537790] usbcore: registered new interface driver int51x1
[    1.543726] usbcore: registered new interface driver kalmia
[    1.549518] usbcore: registered new interface driver ipheth
[    1.555292] usbcore: registered new interface driver sierra_net
[    1.561421] usbcore: registered new interface driver cx82310_eth
[    1.567645] usbcore: registered new interface driver cdc_ncm
[    1.573511] usbcore: registered new interface driver qmi_wwan
[    1.579470] usbcore: registered new interface driver cdc_mbim
[    1.585634] 10180000.usb supply vusb_d not found, using dummy regulator
[    1.592481] 10180000.usb supply vusb_a not found, using dummy regulator
[    1.803685] dwc2 10180000.usb: EPs: 10, dedicated fifos, 972 entries in SPRAM
[    1.817377] dwc2 10180000.usb: DWC OTG Controller
[    1.822287] dwc2 10180000.usb: new USB bus registered, assigned bus number 1
[    1.829464] dwc2 10180000.usb: irq 24, io mem 0x10180000
[    1.835330] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    1.842192] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.849467] usb usb1: Product: DWC OTG Controller
[    1.854222] usb usb1: Manufacturer: Linux 4.4.194 dwc2_hsotg
[    1.859931] usb usb1: SerialNumber: 10180000.usb
[    1.865817] hub 1-0:1.0: USB hub found
[    1.869829] hub 1-0:1.0: 1 port detected
[    1.875180] 101c0000.usb supply vusb_d not found, using dummy regulator
[    1.882097] 101c0000.usb supply vusb_a not found, using dummy regulator
[    2.000500] dwc2 101c0000.usb: DWC OTG Controller
[    2.005410] dwc2 101c0000.usb: new USB bus registered, assigned bus number 2
[    2.012587] dwc2 101c0000.usb: irq 25, io mem 0x101c0000
[    2.018638] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    2.025508] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    2.032785] usb usb2: Product: DWC OTG Controller
[    2.037544] usb usb2: Manufacturer: Linux 4.4.194 dwc2_hsotg
[    2.043251] usb usb2: SerialNumber: 101c0000.usb
[    2.049114] hub 2-0:1.0: USB hub found
[    2.053126] hub 2-0:1.0: 1 port detected
[    2.059713] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    2.066433] ehci-platform: EHCI generic platform driver
[    2.072046] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    2.078459] ohci-platform: OHCI generic platform driver
[    2.084242] usbcore: registered new interface driver cdc_acm
[    2.090063] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[    2.098330] usbcore: registered new interface driver usblp
[    2.104142] usbcore: registered new interface driver cdc_wdm
[    2.110127] usbcore: registered new interface driver usb-storage
[    2.116368] usbcore: registered new interface driver ums-alauda
[    2.122512] usbcore: registered new interface driver ums-cypress
[    2.128739] usbcore: registered new interface driver ums-datafab
[    2.134959] usbcore: registered new interface driver ums-freecom
[    2.141203] usbcore: registered new interface driver ums-isd200
[    2.147343] usbcore: registered new interface driver ums-jumpshot
[    2.153697] usbcore: registered new interface driver ums-karma
[    2.159744] usbcore: registered new interface driver ums-onetouch
[    2.166059] usbcore: registered new interface driver ums-sddr09
[    2.172200] usbcore: registered new interface driver ums-sddr55
[    2.178336] usbcore: registered new interface driver ums-usbat
[    2.184526] usbcore: registered new interface driver usbserial
[    2.190562] usbcore: registered new interface driver usbserial_generic
[    2.197234] usbserial: USB Serial support registered for generic
[    2.203472] usbcore: registered new interface driver option
[    2.209207] usbserial: USB Serial support registered for GSM modem (1-port)
[    2.216730] usbcore: registered new interface driver trancevibrator
[    2.223108] usb20_otg: version 3.10a 21-DEC-2012
[    2.228125] usb20_host: version 3.10a 21-DEC-2012
[    2.240924] usbcore: registered new interface driver xpad
[    2.254093] sensor_register_slave:mma8452,id=17
[    2.258794] sensor_register_slave:lis3dh,id=7
[    2.263232] sensor_register_slave:mma7660,id=18
[    2.267829] sensor_register_slave:lsm303d,id=23
[    2.272420] sensor_register_slave:gs_mc3230,id=24
[    2.277169] [Gsensor]   gsensor_init
[    2.280806] sensor_register_slave:mpu6880_acc,id=25
[    2.285743] sensor_register_slave:mpu6500_acc,id=26
[    2.290678] sensor_register_slave:lsm330_acc,id=27
[    2.295528] sensor_register_slave:akm8975,id=31
[    2.300118] sensor_register_slave:akm8963,id=32
[    2.304709] sensor_register_slave:l3g4200d,id=46
[    2.309383] sensor_register_slave:l3g20d,id=47
[    2.313885] sensor_register_slave:ewtsa,id=48
[    2.318302] sensor_register_slave:lsm330_gyro,id=52
[    2.323241] sensor_register_slave:cm3217,id=54
[    2.327741] sensor_register_slave:cm3218,id=55
[    2.334214] i2c /dev entries driver
[    2.345196] rtc-hym8563 1-0051: rtc core: registered hym8563 as rtc0
[    2.353496] REG1: supplied by vsys
[    2.359371] REG2: supplied by vsys
[    2.365565] REG3: supplied by vsys
[    2.371785] REG4: supplied by vsys
[    2.376025] VCC_IO: Bringing 3000000uV into 3300000-3300000uV
[    2.384929] sdmmc-supply: supplied by VCC_IO
[    2.389776] REG5: supplied by VCC_IO
[    2.396096] REG6: supplied by VCC_IO
[    2.400798] VDD_HDMI: Bringing 1200000uV into 2500000-2500000uV
[    2.410039] REG7: supplied by VCC_IO
[    2.416596] REG8: supplied by vsys
[    2.422732] REG9: supplied by vsys
[    2.427930] REG10: supplied by vsys
[    2.434523] REG11: supplied by vsys
[    2.440535] REG12: supplied by vsys
[    2.446712] rk3x-i2c 2002f000.i2c: Initialized RK3xxx I2C bus at f0932000
[    2.455018] IR NEC protocol handler initialized
[    2.459653] IR RC5(x/sz) protocol handler initialized
[    2.464781] IR RC6 protocol handler initialized
[    2.469378] IR JVC protocol handler initialized
[    2.473974] IR Sony protocol handler initialized
[    2.478651] IR SANYO protocol handler initialized
[    2.483417] IR Sharp protocol handler initialized
[    2.488443] IR MCE Keyboard/mouse protocol handler initialized
[    2.494368] IR XMP protocol handler initialized
[    2.500175] usbcore: registered new interface driver uvcvideo
[    2.506003] USB Video Class driver (1.1.1)
[    2.510192] CamSys driver version: v0.48.2, CamSys head file version: v1.0.0
[    2.517802] test_power_init: could not find dev node
[    2.524172] Boot mode: coldboot
[    2.528462] device-mapper: uevent: version 1.0.3
[    2.533985] device-mapper: ioctl: 4.34.0-ioctl (2015-10-28) initialised: dm-devel@redhat.com
[    2.547101] device-mapper: verity-avb: AVB error handler initialized with vbmeta device: 
[    2.555448] Bluetooth: HCI UART driver ver 2.3
[    2.560048] Bluetooth: HCI UART protocol H4 registered
[    2.565318] usb 2-1: new high-speed USB device number 2 using dwc2
[    2.571630] Bluetooth: HCI UART protocol LL registered
[    2.577082] rtk_btusb: RTKBT_RELEASE_NAME: 20200318_BT_ANDROID_9.0
[    2.583511] rtk_btusb: Realtek Bluetooth USB driver module init, version 5.2.1
[    2.590791] rtk_btusb: Register usb char device interface for BT driver
[    2.598016] usbcore: registered new interface driver rtk_btusb
[    2.604184] cpu cpu0: OPP-v2 not supported
[    2.611311] cpu cpu0: OPP-v2 not supported
[    2.616099] Synopsys Designware Multimedia Card Interface Driver
[    2.623317] dwmmc_rockchip 10214000.dwmmc: Using PIO mode.
[    2.628908] dwmmc_rockchip 10214000.dwmmc: Version ID is 240a
[    2.634888] dwmmc_rockchip 10214000.dwmmc: DW MMC controller at irq 27,32 bit host data width,256 deep fifo
[    2.644961] dwmmc_rockchip 10214000.dwmmc: No vqmmc regulator found
[    2.783233] dwmmc_rockchip 10214000.dwmmc: 1 slots initialized
[    2.793070] hidraw: raw HID events driver (C) Jiri Kosina
[    2.802481] usb 2-1: New USB device found, idVendor=05e3, idProduct=0608

IT seems to me that:
mmcblk0 haven't been recognized (we use this in the kernel command line)
that serial connections stops

[peppelinux]

using vanilla kernel 5.8.7 I can get a working prompt instead
https://github.com/peppelinux/Radxa-Rock-RK3188/blob/master/batrebox_rk3188_serial.log

my kernel configuration is here:
https://github.com/peppelinux/Radxa-Rock-RK3188/blob/master/linux-5.8.7.config

you can also read the README with my build instruction.