Booting BeagleBone Black using initramfs

Am trying to boot a Linux kernel with initramfs. These are the files present on my SD card(1 single partition):

=> ls mmc 0:1
       108396   MLO
       706216   u-boot.img
      9847296   zImage
    59260   am335x-boneblack-wireless.dtb
      6888870   uRamdisk

    5 file(s), 0 dir(s)

I load the files into the RAM, like this:

=> mmc part

Partition Map for MMC device 0  --   Partition Type: DOS

Part    Start Sector    Num Sectors UUID        Type
  1 2048        62420992    ab88c000-01 0b Boot
=> fatload mmc 0:1 $loadaddr zImage
16335360 bytes read in 1052 ms (14.8 MiB/s)
=> fatload mmc 0:1 $fdtaddr am335x-boneblack-wireless.dtb
59260 bytes read in 11 ms (5.1 MiB/s)
=> setenv bootargs console =console=ttyO0,115200n8\0 rdinit=/bin/sh
=> bootz $loadaddr - $fdtaddr

This happens to be the boot log:

=> bootz $loadaddr - $fdtaddr
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Device Tree to 8ffee000, end 8ffff77b ... OK

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.0.6 (gcc version 6.3.0 (crosstool-NG crosstool-ng-1.23.0)) #2 SMP Sat Apr 6 14:57:41 CEST 2019
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black Wireless
[    0.000000] earlycon: omap8250 at MMIO 0x44e09000 (options '')
[    0.000000] printk: bootconsole [omap8250] enabled
[    0.000000] Memory policy: Data cache writeback
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Reserved 64 MiB at 0x9b800000
[    0.000000] CPU: All CPU(s) started in SVC mode.
[    0.000000] AM335X ES2.1 (sgx neon)
[    0.000000] random: get_random_bytes called from start_kernel+0xa4/0x478 with crng_init=0
[    0.000000] percpu: Embedded 18 pages/cpu @(ptrval) s42280 r8192 d23256 u73728
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 129540
[    0.000000] Kernel command line: console =console=ttyO0,115200n80 rdinit=/bin/sh
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Memory: 413744K/522240K available (13312K kernel code, 1748K rwdata, 6352K rodata, 8192K init, 7564K bss, 42960K reserved, 65536K cma-reserved, 0K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0xe0000000 - 0xff800000   ( 504 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xdfe00000   ( 510 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0x(ptrval) - 0x(ptrval)   (14304 kB)
[    0.000000]       .init : 0x(ptrval) - 0x(ptrval)   (8192 kB)
[    0.000000]       .data : 0x(ptrval) - 0x(ptrval)   (1749 kB)
[    0.000000]        .bss : 0x(ptrval) - 0x(ptrval)   (7565 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Running RCU self tests
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] rcu:     RCU event tracing is enabled.
[    0.000000] rcu:     RCU lockdep checking is enabled.
[    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=1.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] IRQ: Found an INTC at 0x(ptrval) (revision 5.0) with 128 interrupts
[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[    0.000019] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[    0.008095] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.017625] OMAP clocksource: timer1 at 24000000 Hz
[    0.028667] timer_probe: no matching timers found
[    0.034314] Console: colour dummy device 80x30
[    0.038924] printk: console [tty0] enabled
[    0.043249] printk: bootconsole [omap8250] disabled
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.0.6 (dipak@dipak-Lenovo-Flex-2-14) (gcc version 6.3.0 (crosstool-NG crosstool-ng-1.23.0)) #2 SMP Sat Apr 6 14:57:41 CEST 2019
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black Wireless
[    0.000000] earlycon: omap8250 at MMIO 0x44e09000 (options '')
[    0.000000] printk: bootconsole [omap8250] enabled
[    0.000000] Memory policy: Data cache writeback
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Reserved 64 MiB at 0x9b800000
[    0.000000] CPU: All CPU(s) started in SVC mode.
[    0.000000] AM335X ES2.1 (sgx neon)
[    0.000000] random: get_random_bytes called from start_kernel+0xa4/0x478 with crng_init=0
[    0.000000] percpu: Embedded 18 pages/cpu @(ptrval) s42280 r8192 d23256 u73728
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 129540
[    0.000000] Kernel command line: console =console=ttyO0,115200n80 rdinit=/bin/sh
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Memory: 413744K/522240K available (13312K kernel code, 1748K rwdata, 6352K rodata, 8192K init, 7564K bss, 42960K reserved, 65536K cma-reserved, 0K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0xe0000000 - 0xff800000   ( 504 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xdfe00000   ( 510 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0x(ptrval) - 0x(ptrval)   (14304 kB)
[    0.000000]       .init : 0x(ptrval) - 0x(ptrval)   (8192 kB)
[    0.000000]       .data : 0x(ptrval) - 0x(ptrval)   (1749 kB)
[    0.000000]        .bss : 0x(ptrval) - 0x(ptrval)   (7565 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Running RCU self tests
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] rcu:     RCU event tracing is enabled.
[    0.000000] rcu:     RCU lockdep checking is enabled.
[    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=1.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] IRQ: Found an INTC at 0x(ptrval) (revision 5.0) with 128 interrupts
[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[    0.000019] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[    0.008095] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.017625] OMAP clocksource: timer1 at 24000000 Hz
[    0.028667] timer_probe: no matching timers found
[    0.034314] Console: colour dummy device 80x30
[    0.038924] printk: console [tty0] enabled
[    0.043249] printk: bootconsole [omap8250] disabled
[    0.048325] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    0.048387] This ensures that you still see kernel messages. Please
[    0.048445] update your kernel commandline.
[    0.048496] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[    0.048567] ... MAX_LOCKDEP_SUBCLASSES:  8
[    0.048611] ... MAX_LOCK_DEPTH:          48
[    0.048655] ... MAX_LOCKDEP_KEYS:        8191
[    0.048700] ... CLASSHASH_SIZE:          4096
[    0.048746] ... MAX_LOCKDEP_ENTRIES:     32768
[    0.048792] ... MAX_LOCKDEP_CHAINS:      65536
[    0.048838] ... CHAINHASH_SIZE:          32768
[    0.048884]  memory used by lock dependency info: 4591 kB
[    0.048938]  per task-struct memory footprint: 1536 bytes
[    0.049062] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)
[    0.132958] pid_max: default: 32768 minimum: 301
[    0.133410] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.133486] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.136438] CPU: Testing write buffer coherency: ok
[    0.136649] CPU0: Spectre v2: using BPIALL workaround
[    0.137967] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[    0.140038] Setting up static identity map for 0x80300000 - 0x803000a0
[    0.142979] rcu: Hierarchical SRCU implementation.
[    0.148386] EFI services will not be available.
[    0.149031] smp: Bringing up secondary CPUs ...
[    0.149098] smp: Brought up 1 node, 1 CPU
[    0.149151] SMP: Total of 1 processors activated (996.14 BogoMIPS).
[    0.149220] CPU: All CPU(s) started in SVC mode.
[    0.152238] devtmpfs: initialized
[    0.186341] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[    0.187188] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.187354] futex hash table entries: 256 (order: 2, 16384 bytes)
[    0.192001] pinctrl core: initialized pinctrl subsystem
[    0.198138] DMI not present or invalid.
[    0.199806] NET: Registered protocol family 16
[    0.206600] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.286544] l3-aon-clkctrl:0000:0: failed to disable
[    0.344880] cpuidle: using governor menu
[    0.412289] No ATAGs?
[    0.412303] hw-breakpoint: debug architecture 0x4 unsupported.
[    0.413746] omap4_sram_init:Unable to allocate sram needed to handle errata I688
[    0.413865] omap4_sram_init:Unable to get sram pool needed to handle errata I688
[    0.429157] Serial: AMBA PL011 UART driver
[    0.484904] edma 49000000.edma: TI EDMA DMA engine driver
[    0.486516] AT91: Could not find identification node
[    0.495629] vgaarb: loaded
[    0.497765] SCSI subsystem initialized
[    0.499411] usbcore: registered new interface driver usbfs
[    0.499705] usbcore: registered new interface driver hub
[    0.499915] usbcore: registered new device driver usb
[    0.504497] pps_core: LinuxPPS API ver. 1 registered
[    0.504588] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.504740] PTP clock support registered
[    0.505299] EDAC MC: Ver: 3.0.0
[    0.515281] clocksource: Switched to clocksource timer1
[    1.020124] NET: Registered protocol family 2
[    1.022058] tcp_listen_portaddr_hash hash table entries: 256 (order: 1, 10240 bytes)
[    1.022226] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[    1.022378] TCP bind hash table entries: 4096 (order: 5, 147456 bytes)
[    1.022993] TCP: Hash tables configured (established 4096 bind 4096)
[    1.023448] UDP hash table entries: 256 (order: 2, 20480 bytes)
[    1.023620] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes)
[    1.024065] NET: Registered protocol family 1
[    1.026961] RPC: Registered named UNIX socket transport module.
[    1.027112] RPC: Registered udp transport module.
[    1.027172] RPC: Registered tcp transport module.
[    1.027230] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    1.501799] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[    1.506880] Initialise system trusted keyrings
[    1.507915] workingset: timestamp_bits=30 max_order=17 bucket_order=0
[    1.529318] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    1.531982] NFS: Registering the id_resolver key type
[    1.532228] Key type id_resolver registered
[    1.532343] Key type id_legacy registered
[    1.532560] ntfs: driver 2.1.32 [Flags: R/O].
[    1.546879] Key type asymmetric registered
[    1.547189] Asymmetric key parser 'x509' registered
[    1.547451] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247)
[    1.547640] io scheduler mq-deadline registered
[    1.547705] io scheduler kyber registered
[    1.566974] OMAP GPIO hardware version 0.1
[    1.593481] ti-sysc 48042000.target-module: sysc_flags 00000222 != 00000022
[    1.596115] ti-sysc 48044000.target-module: sysc_flags 00000222 != 00000022
[    1.598585] ti-sysc 48046000.target-module: sysc_flags 00000222 != 00000022
[    1.600974] ti-sysc 48048000.target-module: sysc_flags 00000222 != 00000022
[    1.603390] ti-sysc 4804a000.target-module: sysc_flags 00000222 != 00000022
[    1.630666] GPIO line 106 (LS_BUF_EN) hogged as output/high
[    1.637822] ti-sysc 4830e000.target-module: idlemodes 00000087 != 00000007
[    1.642747] ti-sysc 4a101200.target-module: rev_offs 00001200 != 00000000
[    1.642863] ti-sysc 4a101200.target-module: sysc_offs 00001208 != 00000008
[    1.642944] ti-sysc 4a101200.target-module: syss_offs 00001204 != 00000004
[    1.688401] pinctrl-single 44e10800.pinmux: 142 pins, size 568
[    1.896317] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    1.911226] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 30, base_baud = 3000000) is a 8250
[    2.648199] random: fast init done
[    2.742173] printk: console [ttyS0] enabled
[    2.750948] 481a6000.serial: ttyS3 at MMIO 0x481a6000 (irq = 47, base_baud = 3000000) is a 8250
[    2.760485] serial serial0: tty port ttyS3 registered
[    2.768961] SuperH (H)SCI(F) driver initialized
[    2.776960] msm_serial: driver initialized
[    2.781815] STMicroelectronics ASC driver initialized
[    2.790359] STM32 USART driver initialized
[    2.798930] omap_rng 48310000.rng: Random Number Generator ver. 20
[    2.850322] brd: module loaded
[    2.877130] loop: module loaded
[    2.912266] libphy: Fixed MDIO Bus: probed
[    2.919278] CAN device driver interface
[    2.926405] bgmac_bcma: Broadcom 47xx GBit MAC driver loaded
[    2.935854] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[    2.941796] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[    2.948031] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.4.0-k
[    2.955160] igb: Copyright (c) 2007-2014 Intel Corporation.
[    2.974178] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver
[    2.981981] usbcore: registered new interface driver pegasus
[    2.987920] usbcore: registered new interface driver asix
[    2.993497] usbcore: registered new interface driver ax88179_178a
[    2.999823] usbcore: registered new interface driver cdc_ether
[    3.005923] usbcore: registered new interface driver smsc75xx
[    3.011862] usbcore: registered new interface driver smsc95xx
[    3.017825] usbcore: registered new interface driver net1080
[    3.023648] usbcore: registered new interface driver cdc_subset
[    3.029788] usbcore: registered new interface driver zaurus
[    3.035620] usbcore: registered new interface driver cdc_ncm
[    3.049203] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    3.055977] ehci-pci: EHCI PCI platform driver
[    3.060608] ehci-platform: EHCI generic platform driver
[    3.066688] ehci-orion: EHCI orion driver
[    3.071354] SPEAr-ehci: EHCI SPEAr driver
[    3.076092] ehci-st: EHCI STMicroelectronics driver
[    3.081604] ehci-exynos: EHCI EXYNOS driver
[    3.086501] ehci-atmel: EHCI Atmel driver
[    3.091105] tegra-ehci: Tegra EHCI driver
[    3.095852] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    3.102213] ohci-pci: OHCI PCI platform driver
[    3.106936] ohci-platform: OHCI generic platform driver
[    3.112915] SPEAr-ohci: OHCI SPEAr driver
[    3.117655] ohci-st: OHCI STMicroelectronics driver
[    3.123154] ohci-atmel: OHCI Atmel driver
[    3.129591] usbcore: registered new interface driver usb-storage
[    3.146465] am335x-phy-driver 47401300.usb-phy: 47401300.usb-phy supply vcc not found, using dummy regulator
[    3.157439] am335x-phy-driver 47401300.usb-phy: Linked as a consumer to regulator.0
[    3.176233] am335x-phy-driver 47401b00.usb-phy: 47401b00.usb-phy supply vcc not found, using dummy regulator
[    3.186746] am335x-phy-driver 47401b00.usb-phy: Linked as a consumer to regulator.0
[    3.227463] udc-core: couldn't find an available UDC - added [g_ether] to list of pending drivers
[    3.250277] i2c /dev entries driver
[    3.300739] sdhci: Secure Digital Host Controller Interface driver
[    3.307204] sdhci: Copyright(c) Pierre Ossman
[    3.319292] omap_gpio 44e07000.gpio: Could not set line 6 debounce to 200000 microseconds (-22)
[    3.328389] omap_hsmmc 48060000.mmc: Got CD GPIO
[    3.334419] omap_hsmmc 48060000.mmc: Linked as a consumer to regulator.1
[    3.371629] omap_hsmmc 481d8000.mmc: Linked as a consumer to regulator.1
[    3.407964] Synopsys Designware Multimedia Card Interface Driver
[    3.419211] sdhci-pltfm: SDHCI platform and OF driver helper
[    3.438612] ledtrig-cpu: registered to indicate activity on CPUs
[    3.448829] usbcore: registered new interface driver usbhid
[    3.454525] usbhid: USB HID core driver
[    3.474765] NET: Registered protocol family 10
[    3.483902] Segment Routing with IPv6
[    3.488028] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[    3.496053] NET: Registered protocol family 17
[    3.500644] can: controller area network core (rev 20170425 abi 9)
[    3.507330] NET: Registered protocol family 29
[    3.511868] can: raw protocol (rev 20170425)
[    3.516623] can: broadcast manager protocol (rev 20170425 t)
[    3.522409] can: netlink gateway (rev 20170425) max_hops=1
[    3.529341] Key type dns_resolver registered
[    3.533936] ThumbEE CPU extension supported.
[    3.538454] Registering SWP/SWPB emulation handler
[    3.543353] omap_voltage_late_init: Voltage driver support not added
[    3.555564] Loading compiled-in X.509 certificates
[    3.601935] mmc0: host does not support reading read-only switch, assuming write-enable
[    3.618606] mmc0: new high speed SDHC card at address 0001
[    3.631996] mmcblk0: mmc0:0001 00000 29.8 GiB 
[    3.643167]  mmcblk0: p1
[    3.690571] tps65217 0-0024: TPS65217 ID 0xe version 1.2
[    3.700029] at24 0-0050: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[    3.708189] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[    3.717653] mmc1: new high speed MMC card at address 0001
[    3.726663] mmcblk1: mmc1:0001 M62704 3.56 GiB 
[    3.732327] mmcblk1boot0: mmc1:0001 M62704 partition 1 2.00 MiB
[    3.739673] mmcblk1boot1: mmc1:0001 M62704 partition 2 2.00 MiB
[    3.747210] mmcblk1rpmb: mmc1:0001 M62704 partition 3 512 KiB, chardev (236:0)
[    3.757735]  mmcblk1: p1
[    3.847892] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
[    3.870710] using random self ethernet address
[    3.875574] using random host ethernet address
[    3.882606] usb0: HOST MAC de:9c:99:a0:ed:aa
[    3.887979] usb0: MAC 3e:09:49:89:2b:b0
[    3.891974] using random self ethernet address
[    3.896627] using random host ethernet address
[    3.901796] g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
[    3.908699] g_ether gadget: g_ether ready
[    3.930112] omap_hsmmc 47810000.mmc: Linked as a consumer to regulator.2
[    4.053333] hctosys: unable to open rtc device (rtc0)
[    4.064210] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -2
[    4.072047] Please append a correct "root=" boot option; here are the available partitions:
[    4.080626] 0100           65536 ram0 
[    4.080633]  (driver?)
[    4.086900] 0101           65536 ram1 
[    4.086904]  (driver?)
[    4.093114] 0102           65536 ram2 
[    4.093118]  (driver?)
[    4.099376] 0103           65536 ram3 
[    4.099380]  (driver?)
[    4.105651] 0104           65536 ram4 
[    4.105655]  (driver?)
[    4.111866] 0105           65536 ram5 
[    4.111870]  (driver?)
[    4.118126] 0106           65536 ram6 
[    4.118130]  (driver?)
[    4.124336] 0107           65536 ram7 
[    4.124340]  (driver?)
[    4.130596] 0108           65536 ram8 
[    4.130600]  (driver?)
[    4.136900] 0109           65536 ram9 
[    4.136904]  (driver?)
[    4.143114] 010a           65536 ram10 
[    4.143117]  (driver?)
[    4.149462] 010b           65536 ram11 
[    4.149466]  (driver?)
[    4.155806] 010c           65536 ram12 
[    4.155810]  (driver?)
[    4.162106] 010d           65536 ram13 
[    4.162109]  (driver?)
[    4.168452] 010e           65536 ram14 
[    4.168456]  (driver?)
[    4.174750] 010f           65536 ram15 
[    4.174754]  (driver?)
[    4.181121] b300        31211520 mmcblk0 
[    4.181125]  driver: mmcblk
[    4.188087]   b301        31210496 mmcblk0p1 ab88c000-01
[    4.188091] 
[    4.195004] b310         3735552 mmcblk1 
[    4.195008]  driver: mmcblk
[    4.201964]   b311         3731456 mmcblk1p1 f82e610e-01
[    4.201968] 
[    4.208929] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    4.217318] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.0.6 #2
[    4.223234] Hardware name: Generic AM33XX (Flattened Device Tree)
[    4.229450] [<c0312610>] (unwind_backtrace) from [<c030d0e0>] (show_stack+0x10/0x14)
[    4.237316] [<c030d0e0>] (show_stack) from [<c0f2c414>] (dump_stack+0xa4/0xd0)
[    4.244657] [<c0f2c414>] (dump_stack) from [<c03466b0>] (panic+0x114/0x304)
[    4.251730] [<c03466b0>] (panic) from [<c1701624>] (mount_block_root+0x1a8/0x290)
[    4.259326] [<c1701624>] (mount_block_root) from [<c1701990>] (mount_root+0x144/0x160)
[    4.267360] [<c1701990>] (mount_root) from [<c1701b28>] (prepare_namespace+0x17c/0x1c4)
[    4.275482] [<c1701b28>] (prepare_namespace) from [<c0f46600>] (kernel_init+0x8/0x114)
[    4.283518] [<c0f46600>] (kernel_init) from [<c03010b4>] (ret_from_fork+0x14/0x20)
[    4.291195] Exception stack(0xdb0b9fb0 to 0xdb0b9ff8)
[    4.296325] 9fa0:                                     00000000 00000000 00000000 00000000
[    4.304621] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    4.312917] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    4.319889] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
[    4.478233] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)

What am I doing wrong here? Am more or less following the instruction laid out here: https://books.google.de/books?id=_h_lCwAAQBAJ&lpg=PA87&dq=fatload%20mmc%200%3A1%200x80f00000%20am335x-boneblack.dtb&pg=PA113#v=onepage&q=fatload%20mmc%200:1%200x80f00000%20am335x-boneblack.dtb&f=false