I'm trying to boot the 4.4.3 kernel 
from https://github.com/beagleboard/linux/tree/4.4 on a beaglebone white 
and the kernel stops the boot after 'Waiting for root device'

The MMC* and REGULATOR* options are enabled:
CONFIG_MMC=y
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=16
CONFIG_MMC_BLOCK_BOUNCE=y
CONFIG_MMC_OMAP=y
CONFIG_MMC_OMAP_HS=y
CONFIG_REGULATOR=y
CONFIG_REGULATOR_FIXED_VOLTAGE=y
CONFIG_REGULATOR_USERSPACE_CONSUMER=y
CONFIG_REGULATOR_ACT8865=m
CONFIG_REGULATOR_ANATOP=y
CONFIG_REGULATOR_AS3722=y
CONFIG_REGULATOR_AXP20X=y
CONFIG_REGULATOR_DA9052=y
CONFIG_REGULATOR_DA9063=y
CONFIG_REGULATOR_FAN53555=m
CONFIG_REGULATOR_GPIO=y
CONFIG_REGULATOR_MC13XXX_CORE=m
CONFIG_REGULATOR_MC13783=m
CONFIG_REGULATOR_MC13892=m
CONFIG_REGULATOR_MT6311=y
CONFIG_REGULATOR_PALMAS=y
CONFIG_REGULATOR_PBIAS=y
CONFIG_REGULATOR_PFUZE100=y
CONFIG_REGULATOR_PWM=y
CONFIG_REGULATOR_S2MPA01=m
CONFIG_REGULATOR_S2MPS11=m
CONFIG_REGULATOR_S5M8767=m
CONFIG_REGULATOR_TI_ABB=y
CONFIG_REGULATOR_TPS65023=y
CONFIG_REGULATOR_TPS6507X=y
CONFIG_REGULATOR_TPS65217=y
CONFIG_REGULATOR_TPS65218=y
CONFIG_REGULATOR_TPS65910=y
CONFIG_REGULATOR_TWL4030=y
CONFIG_REGULATOR_VEXPRESS=m

The config is generated from bb.org_defconfig.

The full boot log is:
## Booting kernel from Legacy Image at 82000000 ...
   Image Name:   Linux-4.4.3+
   Image Type:   ARM Linux Kernel Image (no loading done) (uncompressed)
   Data Size:    8112968 Bytes = 7.7 MiB
   Load Address: fffffff2
   Entry Point:  fffffff2
   Verifying Checksum ... OK
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   XIP Kernel Image (no loading done) ... OK
   Using Device Tree in place at 88000000, end 88010cb3

Starting kernel ...

[    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 4.4.3+ () (gcc version 4.9.x-google 20150123 
(prerelease) (4.9.2_cos_gg_21201ea_4.9.2-r116) ) #30 Tue Mar 8 17:27:58 PST 
2016
[    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] Machine model: TI AM335x BeagleBone
[    0.000000] cma: Reserved 24 MiB at 0x8e800000
[    0.000000] Memory policy: Data cache writeback
[    0.000000] CPU: All CPU(s) started in SVC mode.
[    0.000000] AM335X ES1.0 (sgx neon )
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on. 
 Total pages: 64960
[    0.000000] Kernel command line: console=ttyO0,115200n8 loglevel=7 
init=/sbin/init cros_legacy cros_debug oops=panic panic=-1 noinitrd 
vt.global_cursor_default=0 
capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART4,BB-UART5,bone-servo-gpios,bone-servo-spi1
 
root=/dev/mmcblk0p3 ro rootfstype=ext4 rootwait
[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 
bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Memory: 218028K/262144K available (10677K kernel code, 836K 
rwdata, 3704K rodata, 592K init, 857K bss, 19540K reserved, 24576K 
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 : 0xd0800000 - 0xff800000   ( 752 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0008000 - 0xc0e1370c   (14382 kB)
[    0.000000]       .init : 0xc0e14000 - 0xc0ea8000   ( 592 kB)
[    0.000000]       .data : 0xc0ea8000 - 0xc0f791c8   ( 837 kB)
[    0.000000]        .bss : 0xc0f7d000 - 0xc1053514   ( 858 kB)
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 
interrupts
[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[    0.000021] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 
89478484971ns
[    0.000050] clocksource: timer1: mask: 0xffffffff max_cycles: 
0xffffffff, max_idle_ns: 79635851949 ns
[    0.000068] OMAP clocksource: timer1 at 24000000 Hz
[    0.000470] Console: colour dummy device 80x30
[    0.000515] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    0.000525] This ensures that you still see kernel messages. Please
[    0.000534] update your kernel commandline.
[    0.000559] Calibrating delay loop... 548.86 BogoMIPS (lpj=2744320)
[    0.048563] pid_max: default: 32768 minimum: 301
[    0.048750] Security Framework initialized
[    0.048769] Yama: becoming mindful.
[    0.048821] AppArmor: AppArmor disabled by boot time parameter
[    0.049088] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.049105] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 
bytes)
[    0.050234] Initializing cgroup subsys io
[    0.050275] Initializing cgroup subsys memory
[    0.050329] Initializing cgroup subsys devices
[    0.050352] Initializing cgroup subsys freezer
[    0.050387] Initializing cgroup subsys net_cls
[    0.050407] Initializing cgroup subsys perf_event
[    0.050427] Initializing cgroup subsys net_prio
[    0.050448] Initializing cgroup subsys pids
[    0.050522] CPU: Testing write buffer coherency: ok
[    0.050598] ftrace: allocating 31771 entries in 94 pages
[    0.204559] Setting up static identity map for 0x80008200 - 0x80008258
[    0.212365] devtmpfs: initialized
[    0.236406] VFP support v0.3: implementor 41 architecture 3 part 30 
variant c rev 3
[    0.258482] omap_hwmod: debugss: _wait_target_disable failed
[    0.316406] clocksource: jiffies: mask: 0xffffffff max_cycles: 
0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.319786] xor: measuring software checksum speed
[    0.418511]    arm4regs  :   670.800 MB/sec
[    0.518506]    8regs     :   601.200 MB/sec
[    0.618507]    32regs    :   599.600 MB/sec
[    0.718505]    neon      :   967.600 MB/sec
[    0.718517] xor: using function: neon (967.600 MB/sec)
[    0.718626] pinctrl core: initialized pinctrl subsystem
[    0.721372] NET: Registered protocol family 16
[    0.725267] DMA: preallocated 256 KiB pool for atomic coherent 
allocations
[    0.734367] OMAP GPIO hardware version 0.1
[    0.749607] No ATAGs?
[    0.749650] hw-breakpoint: debug architecture 0x4 unsupported.
[    0.928636] raid6: int32x1  gen()   128 MB/s
[    1.098521] raid6: int32x1  xor()    95 MB/s
[    1.268872] raid6: int32x2  gen()   165 MB/s
[    1.438707] raid6: int32x2  xor()   112 MB/s
[    1.608832] raid6: int32x4  gen()   163 MB/s
[    1.778551] raid6: int32x4  xor()   109 MB/s
[    1.948595] raid6: int32x8  gen()   169 MB/s
[    2.118633] raid6: int32x8  xor()    98 MB/s
[    2.288512] raid6: neonx1   gen()   805 MB/s
[    2.458524] raid6: neonx1   xor()   466 MB/s
[    2.628530] raid6: neonx2   gen()  1039 MB/s
[    2.798546] raid6: neonx2   xor()   645 MB/s
[    2.968513] raid6: neonx4   gen()  1064 MB/s
[    3.138526] raid6: neonx4   xor()   665 MB/s
[    3.308510] raid6: neonx8   gen()   541 MB/s
[    3.478535] raid6: neonx8   xor()   407 MB/s
[    3.478548] raid6: using algorithm neonx4 gen() 1064 MB/s
[    3.478558] raid6: .... xor() 665 MB/s, rmw enabled
[    3.478568] raid6: using intx1 recovery algorithm
[    3.491647] edma 49000000.edma: TI EDMA DMA engine driver
[    3.498697] SCSI subsystem initialized
[    3.499681] usbcore: registered new interface driver usbfs
[    3.499792] usbcore: registered new interface driver hub
[    3.499917] usbcore: registered new device driver usb
[    3.500727] omap_i2c 44e0b000.i2c: could not find pctldev for node 
/ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring 
probe
[    3.500796] omap_i2c 4819c000.i2c: could not find pctldev for node 
/ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c2_pins, deferring 
probe
[    3.500946] media: Linux media interface: v0.10
[    3.501053] Linux video capture interface: v2.00
[    3.501209] pps_core: LinuxPPS API ver. 1 registered
[    3.501220] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo 
Giometti <giome...@linux.it>
[    3.501266] PTP clock support registered
[    3.502198] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[    3.503983] NetLabel: Initializing
[    3.504004] NetLabel:  domain hash size = 128
[    3.504012] NetLabel:  protocols = UNLABELED CIPSOv4
[    3.504097] NetLabel:  unlabeled traffic allowed by default
[    3.505224] clocksource: Switched to clocksource timer1
[    3.636952] NET: Registered protocol family 2
[    3.638152] TCP established hash table entries: 2048 (order: 1, 8192 
bytes)
[    3.638203] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[    3.638244] TCP: Hash tables configured (established 2048 bind 2048)
[    3.638353] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    3.638381] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    3.638666] NET: Registered protocol family 1
[    3.639393] RPC: Registered named UNIX socket transport module.
[    3.639412] RPC: Registered udp transport module.
[    3.639421] RPC: Registered tcp transport module.
[    3.639430] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    3.641012] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 
counters available
[    3.644220] futex hash table entries: 256 (order: -1, 3072 bytes)
[    3.644382] audit: initializing netlink subsys (disabled)
[    3.644490] audit: type=2000 audit(3.540:1): initialized
[    3.646190] zbud: loaded
[    3.646667] VFS: Disk quotas dquot_6.6.0
[    3.646757] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 
bytes)
[    3.647667] NFS: Registering the id_resolver key type
[    3.647772] Key type id_resolver registered
[    3.647785] Key type id_legacy registered
[    3.647826] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    3.648287] fuse init (API version 7.23)
[    3.648641] SGI XFS with ACLs, security attributes, realtime, no debug 
enabled
[    3.656354] Block layer SCSI generic (bsg) driver version 0.4 loaded 
(major 249)
[    3.656636] io scheduler noop registered
[    3.656661] io scheduler deadline registered
[    3.656723] io scheduler cfq registered (default)
[    3.658439] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 
568
[    3.661517] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
[    3.665655] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, 
base_baud = 3000000) is a 8250
[    4.467095] console [ttyS0] enabled
[    4.471821] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 159, 
base_baud = 3000000) is a 8250
[    4.481743] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 160, 
base_baud = 3000000) is a 8250
[    4.491630] 481a8000.serial: ttyS4 at MMIO 0x481a8000 (irq = 161, 
base_baud = 3000000) is a 8250
[    4.501483] 481aa000.serial: ttyS5 at MMIO 0x481aa000 (irq = 162, 
base_baud = 3000000) is a 8250
[    4.512289] [drm] Initialized drm 1.1.0 20060810
[    4.518885] usbcore: registered new interface driver dln2
[    4.585324] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[    4.591475] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
[    4.598168] davinci_mdio: dt: updated phy_id[0] from phy_mask[fffffffe]
[    4.606446] libphy: 4a101000.mdio: probed
[    4.610507] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, 
driver SMSC LAN8710/LAN8720
[    4.620686] cpsw 4a100000.ethernet: Detected MACID = d0:ff:50:52:5c:5a
[    4.629357] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    4.636067] ehci-platform: EHCI generic platform driver
[    4.641578] ehci-omap: OMAP-EHCI Host Controller driver
[    4.647415] usbcore: registered new interface driver usb-storage
[    4.666634] 47401300.usb-phy supply vcc not found, using dummy regulator
[    4.677638] 47401b00.usb-phy supply vcc not found, using dummy regulator
[    4.687112] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[    4.692933] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned 
bus number 1
[    4.701185] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    4.708052] usb usb1: New USB device strings: Mfr=3, Product=2, 
SerialNumber=1
[    4.715332] usb usb1: Product: MUSB HDRC host driver
[    4.720325] usb usb1: Manufacturer: Linux 4.4.3+ musb-hcd
[    4.725770] usb usb1: SerialNumber: musb-hdrc.1.auto
[    4.731962] hub 1-0:1.0: USB hub found
[    4.735852] hub 1-0:1.0: 1 port detected
[    4.742936] mousedev: PS/2 mouse device common for all mice
[    4.750812] omap_rtc 44e3e000.rtc: already running
[    4.756302] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as 
rtc0
[    4.764355] i2c /dev entries driver
[    4.768513] Driver for 1-wire Dallas network protocol.
[    4.776523] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 
sec
[    4.784636] omap_hsmmc 48060000.mmc: Got CD GPIO
[    4.790349] ledtrig-cpu: registered to indicate activity on CPUs
[    4.796612] hidraw: raw HID events driver (C) Jiri Kosina
[    4.802879] usbcore: registered new interface driver usbhid
[    4.808537] usbhid: USB HID core driver
[    4.812737] ashmem: initialized
[    4.816839]  remoteproc0: wkup_m3 is available
[    4.821322]  remoteproc0: Note: remoteproc is still under development 
and considered experimental.
[    4.830384]  remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and 
backward compatibility isn't yet guaranteed.
[    4.843523] oprofile: using arm/armv7
[    4.848042] NET: Registered protocol family 10
[    4.854193] mip6: Mobile IPv6
[    4.857330] NET: Registered protocol family 17
[    4.861975] Key type dns_resolver registered
[    4.866314] mpls_gso: MPLS GSO support
[    4.870737] omap_voltage_late_init: Voltage driver support not added
[    4.878342] ThumbEE CPU extension supported.
[    4.882670] Registering SWP/SWPB emulation handler
[    4.888949] registered taskstats version 1
[    4.893329] zswap: loaded using pool lzo/zbud
[    4.899200] Btrfs loaded
[    4.903849] Key type encrypted registered
[    4.910794] input: tps65217_pwr_but as 
/devices/platform/ocp/44e0b000.i2c/i2c-0/0-0024/input/input0
[    4.941511] tps65217 0-0024: TPS65217 ID 0xf version 1.2
[    4.947684] at24 0-0050: 32768 byte 24c256 EEPROM, writable, 1 
bytes/write
[    4.954652] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[    4.962533] at24 2-0054: 32768 byte 24c256 EEPROM, writable, 1 
bytes/write
[    4.970158] at24 2-0055: 32768 byte 24c256 EEPROM, writable, 1 
bytes/write
[    4.977678] at24 2-0056: 32768 byte 24c256 EEPROM, writable, 1 
bytes/write
[    4.985126] at24 2-0057: 32768 byte 24c256 EEPROM, writable, 1 
bytes/write
[    4.992122] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
[    5.004441] bone_capemgr bone_capemgr: Baseboard: 
'A335BONE,00A6,1715BB000457'
[    5.011764] bone_capemgr bone_capemgr: 
compatible-baseboard=ti,beaglebone - #slots=4
[    5.075249] bone_capemgr bone_capemgr: slot #0: No cape found
[    5.135417] bone_capemgr bone_capemgr: slot #1: No cape found
[    5.195246] bone_capemgr bone_capemgr: slot #2: No cape found
[    5.255245] bone_capemgr bone_capemgr: slot #3: No cape found
[    5.261148] bone_capemgr bone_capemgr: initialized OK.
[    5.267218] omap_hsmmc 48060000.mmc: Got CD GPIO
[    5.273310] omap_rtc 44e3e000.rtc: setting system clock to 2016-02-19 
00:17:19 UTC (1455841039)
[    5.282185] of_cfs_init
[    5.284810] of_cfs_init: OK
[    5.293289] vmmcsd_fixed: disabling
[    5.297707] Waiting for root device /dev/mmcblk0p3...

The bootargs related to root partition are:
root=/dev/mmcblk0p3 ro rootfstype=ext4 rootwait

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