OK, lets see dmesg. Hardware is RPi Model-B. Booting piCore base only, no other partitions on the SD card, no extensions, only external device connected is HDMI monitor and keyboard.
Kernel 3.12.36+, zswap enabled (default cmdline options):
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Initializing cgroup subsys cpuacct
[ 0.000000] Linux version 3.12.36-piCore+ (root@beta.hasix.org) (gcc version 4.9.1 (crosstool-NG 1.20.0) ) #1 PREEMPT Mon Jan 19 22:46:45 CET 2015
[ 0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cr=00c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
[ 0.000000] Machine: BCM2708
[ 0.000000] cma: CMA: reserved 8 MiB at 1b800000
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
[ 0.000000] On node 0 totalpages: 114688
[ 0.000000] free_area_init_node: node 0, pgdat c06304f0, node_mem_map c0d96000
[ 0.000000] Normal zone: 896 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 114688 pages, LIFO batch:31
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 113792
[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1280 bcm2708_fb.fbheight=1024 bcm2708.boardrev=0xe bcm2708.serial=0x7d40730a smsc95xx.macaddr=B8:27:EB:40:73:0A bcm2708_fb.fbswap=1 sdhci-bcm2708.emmc_clock_freq=250000000 vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/ram0 elevator=deadline rootwait nortc loglevel=3 noembed
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[ 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: 435788K/458752K available (4531K kernel code, 260K rwdata, 1364K rodata, 145K init, 702K bss, 22964K reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xdc800000 - 0xff000000 ( 552 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xdc000000 ( 448 MB)
[ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)
[ 0.000000] .text : 0xc0008000 - 0xc05c9f28 (5896 kB)
[ 0.000000] .init : 0xc05ca000 - 0xc05ee64c ( 146 kB)
[ 0.000000] .data : 0xc05f0000 - 0xc0631040 ( 261 kB)
[ 0.000000] .bss : 0xc063104c - 0xc06e0908 ( 703 kB)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] NR_IRQS:522
[ 0.000000] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every 4294967ms
[ 0.000000] Switching to timer-based delay loop
[ 0.000000] Console: colour dummy device 80x30
[ 0.000000] console [tty1] enabled
[ 0.000614] Calibrating delay loop (skipped), value calculated using timer frequency.. 2.00 BogoMIPS (lpj=10000)
[ 0.000634] pid_max: default: 32768 minimum: 301
[ 0.001137] Mount-cache hash table entries: 512
[ 0.001957] Initializing cgroup subsys memory
[ 0.002039] Initializing cgroup subsys devices
[ 0.002056] Initializing cgroup subsys freezer
[ 0.002069] Initializing cgroup subsys blkio
[ 0.002198] CPU: Testing write buffer coherency: ok
[ 0.002617] Setting up static identity map for 0xc0450b58 - 0xc0450bb4
[ 0.004481] devtmpfs: initialized
[ 0.020571] VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5
[ 0.022113] NET: Registered protocol family 16
[ 0.027517] DMA: preallocated 4096 KiB pool for atomic coherent allocations
[ 0.028127] cpuidle: using governor ladder
[ 0.028148] cpuidle: using governor menu
[ 0.028654] bcm2708.uart_clock = 0
[ 0.030535] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.
[ 0.030555] hw-breakpoint: maximum watchpoint size is 4 bytes.
[ 0.030568] mailbox: Broadcom VideoCore Mailbox driver
[ 0.030641] bcm2708_vcio: mailbox at f200b880
[ 0.030721] bcm_power: Broadcom power driver
[ 0.030739] bcm_power_open() -> 0
[ 0.030748] bcm_power_request(0, 8)
[ 0.531457] bcm_mailbox_read -> 00000080, 0
[ 0.531473] bcm_power_request -> 0
[ 0.531720] Serial: AMBA PL011 UART driver
[ 0.531861] dev:f1: ttyAMA0 at MMIO 0x20201000 (irq = 83, base_baud = 0) is a PL011 rev3
[ 0.532208] console [ttyAMA0] enabled
[ 0.554503] bio: create slab <bio-0> at 0
[ 0.555887] SCSI subsystem initialized
[ 0.556087] usbcore: registered new interface driver usbfs
[ 0.556172] usbcore: registered new interface driver hub
[ 0.556424] usbcore: registered new device driver usb
[ 0.557921] Switched to clocksource stc
[ 0.558274] FS-Cache: Loaded
[ 0.558575] CacheFiles: Loaded
[ 0.571012] NET: Registered protocol family 2
[ 0.572505] TCP established hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.572645] TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.572744] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.572824] TCP: reno registered
[ 0.572847] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.572878] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.573339] NET: Registered protocol family 1
[ 0.573901] RPC: Registered named UNIX socket transport module.
[ 0.573926] RPC: Registered udp transport module.
[ 0.573936] RPC: Registered tcp transport module.
[ 0.573945] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.574259] Trying to unpack rootfs image as initramfs...
[ 1.051784] Freeing initrd memory: 3668K (c0a00000 - c0d95000)
[ 1.067683] bcm2708_dma: DMA manager at f2007000
[ 1.067791] bcm2708_gpio: bcm2708_gpio_probe c05fdf10
[ 1.068323] vc-mem: phys_addr:0x00000000 mem_base=0x1ec00000 mem_size:0x20000000(512 MiB)
[ 1.069616] audit: initializing netlink socket (disabled)
[ 1.069701] type=2000 audit(1.060:1): initialized
[ 1.232939] zbud: loaded
[ 1.233442] VFS: Disk quotas dquot_6.5.2
[ 1.233761] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 1.235850] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 1.236272] FS-Cache: Netfs 'nfs' registered for caching
[ 1.237822] NFS: Registering the id_resolver key type
[ 1.238001] Key type id_resolver registered
[ 1.238019] Key type id_legacy registered
[ 1.238763] msgmni has been set to 874
[ 1.240892] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[ 1.241215] io scheduler noop registered
[ 1.241238] io scheduler deadline registered (default)
[ 1.241545] io scheduler cfq registered
[ 1.242882] BCM2708FB: allocated DMA memory 5bc00000
[ 1.242947] BCM2708FB: allocated DMA channel 0 @ f2007000
[ 1.258636] Console: switching to colour frame buffer device 160x64
[ 1.270258] bcm2708-dmaengine bcm2708-dmaengine: Load BCM2835 DMA engine driver
[ 1.270611] uart-pl011 dev:f1: no DMA platform data
[ 1.271249] vc-cma: Videocore CMA driver
[ 1.271269] vc-cma: vc_cma_base = 0x00000000
[ 1.271281] vc-cma: vc_cma_size = 0x00000000 (0 MiB)
[ 1.271291] vc-cma: vc_cma_initial = 0x00000000 (0 MiB)
[ 1.280847] brd: module loaded
[ 1.286008] loop: module loaded
[ 1.286348] vchiq: vchiq_init_state: slot_zero = 0xdb800000, is_master = 0
[ 1.287456] Loading iSCSI transport class v2.0-870.
[ 1.288621] usbcore: registered new interface driver smsc95xx
[ 1.288710] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[ 1.488903] Core Release: 2.80a
[ 1.488934] Setting default values for core params
[ 1.488975] Finished setting default values for core params
[ 1.689055] Using Buffer DMA mode
[ 1.689082] Periodic Transfer Interrupt Enhancement - disabled
[ 1.689094] Multiprocessor Interrupt Enhancement - disabled
[ 1.689106] OTG VER PARAM: 0, OTG VER FLAG: 0
[ 1.689122] Dedicated Tx FIFOs mode
[ 1.689492] WARN::dwc_otg_hcd_init:1042: FIQ DMA bounce buffers: virt = 0xdbc14000 dma = 0x5bc14000 len=9024
[ 1.689528] FIQ FSM acceleration enabled for :
[ 1.689528] Non-periodic Split Transactions
[ 1.689528] Periodic Split Transactions
[ 1.689528] High-Speed Isochronous Endpoints
[ 1.689555] dwc_otg: Microframe scheduler enabled
[ 1.689613] WARN::hcd_init:473: FIQ at 0xc032aa24
[ 1.689630] WARN::hcd_init:474: FIQ ASM at 0xc032acd8 length 36
[ 1.689659] WARN::hcd_init:500: MPHI regs_base at 0xdc806000
[ 1.689689] dwc_otg bcm2708_usb: DWC OTG Controller
[ 1.689743] dwc_otg bcm2708_usb: new USB bus registered, assigned bus number 1
[ 1.689802] dwc_otg bcm2708_usb: irq 32, io mem 0x00000000
[ 1.689840] Init: Port Power? op_state=1
[ 1.689850] Init: Power Port (0)
[ 1.690182] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.690206] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.690221] usb usb1: Product: DWC OTG Controller
[ 1.690236] usb usb1: Manufacturer: Linux 3.12.36-piCore+ dwc_otg_hcd
[ 1.690250] usb usb1: SerialNumber: bcm2708_usb
[ 1.691108] hub 1-0:1.0: USB hub found
[ 1.691196] hub 1-0:1.0: 1 port detected
[ 1.691681] dwc_otg: FIQ enabled
[ 1.691698] dwc_otg: NAK holdoff enabled
[ 1.691709] dwc_otg: FIQ split-transaction FSM enabled
[ 1.691730] Module dwc_common_port init
[ 1.692204] usbcore: registered new interface driver usb-storage
[ 1.692556] mousedev: PS/2 mouse device common for all mice
[ 1.693221] bcm2835-cpufreq: min=700000 max=900000 cur=700000
[ 1.693327] bcm2835-cpufreq: switching to governor ondemand
[ 1.693342] bcm2835-cpufreq: switching to governor ondemand
[ 1.694788] sdhci: Secure Digital Host Controller Interface driver
[ 1.694802] sdhci: Copyright(c) Pierre Ossman
[ 1.694973] DMA channels allocated for the MMC driver
[ 1.727958] Load BCM2835 MMC driver
[ 1.728089] sdhci-pltfm: SDHCI platform and OF driver helper
[ 1.728114] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.728206] hidraw: raw HID events driver (C) Jiri Kosina
[ 1.730456] usbcore: registered new interface driver usbhid
[ 1.730468] usbhid: USB HID core driver
[ 1.736341] zram: Created 1 device(s) ...
[ 1.736805] TCP: cubic registered
[ 1.736820] Initializing XFRM netlink socket
[ 1.736849] NET: Registered protocol family 17
[ 1.736975] Key type dns_resolver registered
[ 1.740096] registered taskstats version 1
[ 1.740147] vc-sm: Videocore shared memory driver
[ 1.740163] [vc_sm_connected_init]: start
[ 1.744911] [vc_sm_connected_init]: end - returning 0
[ 1.748098] Freeing unused kernel memory: 144K (c05ca000 - c05ee000)
[ 1.786139] mmc0: host does not support reading read-only switch. assuming write-enable.
[ 1.788995] mmc0: new high speed SDHC card at address b368
[ 1.794394] mmcblk0: mmc0:b368 SMI 3.74 GiB
[ 1.795743] mmcblk0: p1
[ 1.888230] Indeed it is in host mode hprt0 = 00021501
[ 2.128146] usb 1-1: new high-speed USB device number 2 using dwc_otg
[ 2.128323] Indeed it is in host mode hprt0 = 00001101
[ 2.398334] usb 1-1: New USB device found, idVendor=0424, idProduct=9512
[ 2.398359] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.399070] hub 1-1:1.0: USB hub found
[ 2.399185] hub 1-1:1.0: 3 ports detected
[ 2.678171] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[ 2.778360] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[ 2.778371] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.781180] smsc95xx v1.0.4
[ 2.848599] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:40:73:0a
[ 2.928234] usb 1-1.2: new low-speed USB device number 4 using dwc_otg
[ 3.043986] usb 1-1.2: New USB device found, idVendor=04f3, idProduct=0103
[ 3.044011] usb 1-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.068714] input: HID 04f3:0103 as /devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2:1.0/input/input0
[ 3.069040] hid-generic 0003:04F3:0103.0001: input,hidraw0: USB HID v1.11 Keyboard [HID 04f3:0103] on usb-bcm2708_usb-1.2/input0
[ 3.087116] input: HID 04f3:0103 as /devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2:1.1/input/input1
[ 3.087412] hid-generic 0003:04F3:0103.0002: input,hidraw1: USB HID v1.11 Device [HID 04f3:0103] on usb-bcm2708_usb-1.2/input1
[ 3.142020] bcm2708_i2c_init_pinmode(1,2)
[ 3.142041] bcm2708_i2c_init_pinmode(1,3)
[ 3.142525] bcm2708_i2c bcm2708_i2c.1: BSC1 Controller at 0x20804000 (irq 79) (baudrate 100000)
[ 3.198769] bcm2708_spi bcm2708_spi.0: master is unqueued, this is deprecated
[ 3.208676] bcm2708_spi bcm2708_spi.0: SPI Controller at 0x20204000 (irq 80)
[ 3.624082] Adding 106900k swap on /dev/zram0. Priority:-1 extents:1 across:106900k SSFS
[ 5.664060] bcm2835-cpufreq: switching to governor ondemand
[ 5.664088] bcm2835-cpufreq: switching to governor ondemand
[ 5.748296] i2c /dev entries driver
[ 5.790079] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[ 7.289782] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0x45E1