I'm trying to get mcp2515 to work. It is a can over spi chip and I can't seem to get the device tree overlay right. I made a simple c driver using spidev to check if my hardware was right. Using that driver I can read/write to registers so I'm assuming my hardware is correct. The chip is connected to an external 20mhz oscillator. I've been stuck for this for a week now, and really need some help to get this to work.
A lot of variations on the devicetree overlay posted below.
Hooked up an oscilloscope, and there is no data going in either direction.
Bought a sparkfun can breakoutboard, and some hex converters, but same problem (so hardware is probably right)
I think there is something worng with the way I define the clock or the interrupts, but honestly, I've never done anything this advanced in the device tree overlay, just the regular stuff where there are a lot of resources on the internet, like getting i2c,uart,spi etc. to work.
After enabling the driver lsmod tells me can_dev is loaded and used by mcp251x.
cat /sys/bus/spi/devices/*/modalias returns spi:mcp2515.
ip a show no can devices.
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BB-MIKRO-01";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.25", /* spi irq: gpio3_21 */
"P9.31", /* spi: spi1_sclk */
"P9.29", /* spi: spi1_d0 */
"P9.30", /* spi: spi1_d1 */
"P9.28", /* spi: spi1_cs0 */
/* the hardware IP uses */
"gpio3_21",
"spi1";
clocks{
extclk: oscillator {
compatible="fixed-clock";
#clock-cells = <0>;
clock-frequency=<20000000>;
};
};
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
spi1_pins: pinmux_spi1_pins {
pinctrl-single,pins = <
0x190 0x33 /* mcasp0_aclkx.spi1_sclk, RX_ENABLED | PULLUP | MODE3 */
0x194 0x33 /* mcasp0_fsx.spi1_d0, RX_ENABLED | PULLUP | MODE3 */
0x198 0x13 /* mcasp0_axr0.spi1_d1, OUTPUT_PULLUP | MODE3 */
0x19c 0x13 /* mcasp0_ahclkr.spi1_cs0, OUTPUT_PULLUP | MODE3 */
0x1ac 0x37 /* mcasp0_ahclkx.gpio3_21, RX_ENABLED | PULLUP | MODE7 */
>;
};
};
};
fragment@2 {
target = <&spi1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&spi1_pins>;
ti,pio-mode; /* disable dma when used as an overlay, dma gets stuck at 160 bits... */
can0: can@1 {
compatible = "microchip,mcp2515";
reg = <0>; /* cs0 */
mode = <0>;
spi-max-frequency = <10000000>;
clocks=<&extclk>;
interrupt-parent = <&gpio3>;
interrupts = <21 0x02>;
};
};
};
};
dmesg after enabling it on boot with uEnv.txt:
debian@arm:~$ dmesg
[ 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 4.4.15-ti-r37 (root@a3-imx6q-wandboard-2gb) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Tue Jul 19 17:04:02 UTC 2016
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=50c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine model: TI AM335x BeagleBone Black
[ 0.000000] cma: Reserved 24 MiB at 0x9e000000
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] On node 0 totalpages: 130560
[ 0.000000] free_area_init_node: node 0, pgdat c0c20300, node_mem_map df96d000
[ 0.000000] Normal zone: 1152 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 130560 pages, LIFO batch:31
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES2.1 (sgx neon )
[ 0.000000] PERCPU: Embedded 13 pages/cpu @df925000 s24320 r8192 d20736 u53248
[ 0.000000] pcpu-alloc: s24320 r8192 d20736 u53248 alloc=13*4096
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 129408
[ 0.000000] Kernel command line: console=ttyO0,115200n8 bone_capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN bone_capemgr.enable_partno=BB-MIKRO-01 root=UUID=038be4da-7eba-45f9-977b-3540d6ac25f8 ro rootfstype=ext4 rootwait coherent_pool=1M cape_universal=enable
[ 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: 474144K/522240K available (7291K kernel code, 901K rwdata, 3680K rodata, 600K init, 907K bss, 23520K reserved, 24576K cma-reserved, 0K highmem)
[ 0.000000] Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xe0800000 - 0xff800000 ( 496 MB)
lowmem : 0xc0000000 - 0xe0000000 ( 512 MB)
pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
modules : 0xbf800000 - 0xbfe00000 ( 6 MB)
.text : 0xc0008000 - 0xc0abf164 (10973 kB)
.init : 0xc0ac0000 - 0xc0b56000 ( 600 kB)
.data : 0xc0b56000 - 0xc0c37658 ( 902 kB)
.bss : 0xc0c3a000 - 0xc0d1cd68 ( 908 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] Build-time adjustment of leaf fanout to 32.
[ 0.000000] RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=32, nr_cpu_ids=1
[ 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
[ 0.000013] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000032] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000044] OMAP clocksource: timer1 at 24000000 Hz
[ 0.001148] clocksource_probe: no matching clocksources found
[ 0.001333] Console: colour dummy device 80x30
[ 0.001359] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[ 0.001366] This ensures that you still see kernel messages. Please
[ 0.001372] update your kernel commandline.
[ 0.001389] Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)
[ 0.046926] pid_max: default: 32768 minimum: 301
[ 0.047060] Security Framework initialized
[ 0.047074] Yama: becoming mindful.
[ 0.047107] AppArmor: AppArmor disabled by boot time parameter
[ 0.047265] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.047278] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.048060] Initializing cgroup subsys io
[ 0.048092] Initializing cgroup subsys memory
[ 0.048132] Initializing cgroup subsys devices
[ 0.048149] Initializing cgroup subsys freezer
[ 0.048166] Initializing cgroup subsys net_cls
[ 0.048179] Initializing cgroup subsys perf_event
[ 0.048194] Initializing cgroup subsys net_prio
[ 0.048208] Initializing cgroup subsys pids
[ 0.048265] CPU: Testing write buffer coherency: ok
[ 0.048317] ftrace: allocating 33957 entries in 67 pages
[ 0.132753] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[ 0.132873] Setting up static identity map for 0x80008240 - 0x8000828c
[ 0.136328] Brought up 1 CPUs
[ 0.136349] SMP: Total of 1 processors activated (995.32 BogoMIPS).
[ 0.136357] CPU: All CPU(s) started in SVC mode.
[ 0.137774] devtmpfs: initialized
[ 0.155513] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.173278] omap_hwmod: debugss: _wait_target_disable failed
[ 0.228460] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.230587] xor: measuring software checksum speed
[ 0.266931] arm4regs : 1221.000 MB/sec
[ 0.306926] 8regs : 1093.000 MB/sec
[ 0.346927] 32regs : 1153.000 MB/sec
[ 0.386924] neon : 1731.000 MB/sec
[ 0.386931] xor: using function: neon (1731.000 MB/sec)
[ 0.387029] pinctrl core: initialized pinctrl subsystem
[ 0.388946] NET: Registered protocol family 16
[ 0.392445] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[ 0.393646] cpuidle: using governor ladder
[ 0.393668] cpuidle: using governor menu
[ 0.398764] OMAP GPIO hardware version 0.1
[ 0.409880] No ATAGs?
[ 0.409910] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.410449] omap4_sram_init:Unable to allocate sram needed to handle errata I688
[ 0.410461] omap4_sram_init:Unable to get sram pool needed to handle errata I688
[ 0.487083] raid6: int32x1 gen() 270 MB/s
[ 0.555030] raid6: int32x1 xor() 240 MB/s
[ 0.623073] raid6: int32x2 gen() 356 MB/s
[ 0.690930] raid6: int32x2 xor() 269 MB/s
[ 0.759074] raid6: int32x4 gen() 405 MB/s
[ 0.826936] raid6: int32x4 xor() 259 MB/s
[ 0.895079] raid6: int32x8 gen() 359 MB/s
[ 0.963051] raid6: int32x8 xor() 231 MB/s
[ 1.030955] raid6: neonx1 gen() 1457 MB/s
[ 1.098938] raid6: neonx1 xor() 847 MB/s
[ 1.166932] raid6: neonx2 gen() 1880 MB/s
[ 1.234944] raid6: neonx2 xor() 1166 MB/s
[ 1.302946] raid6: neonx4 gen() 1974 MB/s
[ 1.370942] raid6: neonx4 xor() 1204 MB/s
[ 1.438960] raid6: neonx8 gen() 1211 MB/s
[ 1.506942] raid6: neonx8 xor() 672 MB/s
[ 1.506949] raid6: using algorithm neonx4 gen() 1974 MB/s
[ 1.506956] raid6: .... xor() 1204 MB/s, rmw enabled
[ 1.506962] raid6: using intx1 recovery algorithm
[ 1.515698] edma 49000000.edma: TI EDMA DMA engine driver
[ 1.520192] SCSI subsystem initialized
[ 1.520563] libata version 3.00 loaded.
[ 1.520887] usbcore: registered new interface driver usbfs
[ 1.520957] usbcore: registered new interface driver hub
[ 1.521049] usbcore: registered new device driver usb
[ 1.521603] omap_i2c 44e0b000.i2c: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring probe
[ 1.521648] omap_i2c 4819c000.i2c: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c2_pins, deferring probe
[ 1.521771] media: Linux media interface: v0.10
[ 1.521831] Linux video capture interface: v2.00
[ 1.521934] pps_core: LinuxPPS API ver. 1 registered
[ 1.521943] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 1.521971] PTP clock support registered
[ 1.522810] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[ 1.524190] NetLabel: Initializing
[ 1.524205] NetLabel: domain hash size = 128
[ 1.524211] NetLabel: protocols = UNLABELED CIPSOv4
[ 1.524273] NetLabel: unlabeled traffic allowed by default
[ 1.524648] clocksource: Switched to clocksource timer1
[ 1.630046] NET: Registered protocol family 2
[ 1.630802] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[ 1.630851] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
[ 1.630909] TCP: Hash tables configured (established 4096 bind 4096)
[ 1.630976] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 1.630996] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 1.631287] NET: Registered protocol family 1
[ 1.631798] RPC: Registered named UNIX socket transport module.
[ 1.631809] RPC: Registered udp transport module.
[ 1.631816] RPC: Registered tcp transport module.
[ 1.631821] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.632379] Unpacking initramfs...
[ 1.962944] Freeing initrd memory: 4688K (cfb6c000 - d0000000)
[ 1.963623] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[ 1.966146] futex hash table entries: 256 (order: 2, 16384 bytes)
[ 1.966259] audit: initializing netlink subsys (disabled)
[ 1.966333] audit: type=2000 audit(1.904:1): initialized
[ 1.975995] zbud: loaded
[ 1.976705] VFS: Disk quotas dquot_6.6.0
[ 1.976948] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 1.979438] NFS: Registering the id_resolver key type
[ 1.979506] Key type id_resolver registered
[ 1.979514] Key type id_legacy registered
[ 1.979542] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 1.979872] fuse init (API version 7.23)
[ 1.980445] SGI XFS with ACLs, security attributes, realtime, no debug enabled
[ 1.988161] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
[ 1.988374] io scheduler noop registered
[ 1.988388] io scheduler deadline registered
[ 1.988447] io scheduler cfq registered (default)
[ 1.989826] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
[ 1.991443] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[ 1.992862] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
[ 1.995651] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, base_baud = 3000000) is a 8250
[ 2.891623] console [ttyS0] enabled
[ 2.896537] [drm] Initialized drm 1.1.0 20060810
[ 2.952716] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[ 2.958878] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
[ 2.965446] davinci_mdio: dt: updated phy_id[0] from phy_mask[fffffffe]
[ 2.979016] libphy: 4a101000.mdio: probed
[ 2.983152] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
[ 2.993263] cpsw 4a100000.ethernet: Detected MACID = 6c:ec:eb:ab:d4:bb
[ 3.001765] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 3.008494] ehci-platform: EHCI generic platform driver
[ 3.013967] ehci-omap: OMAP-EHCI Host Controller driver
[ 3.019658] usbcore: registered new interface driver usb-storage
[ 3.027625] 47401300.usb-phy supply vcc not found, using dummy regulator
[ 3.036757] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[ 3.036774] musb-hdrc: MHDRC RTL version 2.0
[ 3.036782] musb-hdrc: setup fifo_mode 4
[ 3.036798] musb-hdrc: 28/31 max ep, 16384/16384 memory
[ 3.038234] 47401b00.usb-phy supply vcc not found, using dummy regulator
[ 3.047121] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[ 3.047137] musb-hdrc: MHDRC RTL version 2.0
[ 3.047145] musb-hdrc: setup fifo_mode 4
[ 3.047159] musb-hdrc: 28/31 max ep, 16384/16384 memory
[ 3.047284] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 3.053152] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
[ 3.061282] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 3.068127] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.075417] usb usb1: Product: MUSB HDRC host driver
[ 3.080420] usb usb1: Manufacturer: Linux 4.4.15-ti-r37 musb-hcd
[ 3.086467] usb usb1: SerialNumber: musb-hdrc.1.auto
[ 3.092369] hub 1-0:1.0: USB hub found
[ 3.096280] hub 1-0:1.0: 1 port detected
[ 3.109261] mousedev: PS/2 mouse device common for all mice
[ 3.116901] omap_rtc 44e3e000.rtc: already running
[ 3.122162] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0
[ 3.130102] i2c /dev entries driver
[ 3.135123] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 3.142459] cpuidle: enable-method property 'ti,am3352' found operations
[ 3.149875] omap_hsmmc 48060000.mmc: Got CD GPIO
[ 3.218047] hidraw: raw HID events driver (C) Jiri Kosina
[ 3.224309] usbcore: registered new interface driver usbhid
[ 3.229992] usbhid: USB HID core driver
[ 3.237318] ashmem: initialized
[ 3.241483] remoteproc0: wkup_m3 is available
[ 3.246057] remoteproc0: Note: remoteproc is still under development and considered experimental.
[ 3.255076] remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.
[ 3.270092] NET: Registered protocol family 10
[ 3.278057] mip6: Mobile IPv6
[ 3.281150] NET: Registered protocol family 17
[ 3.285768] Key type dns_resolver registered
[ 3.290096] mpls_gso: MPLS GSO support
[ 3.294253] omap_voltage_late_init: Voltage driver support not added
[ 3.301939] PM: Cannot get wkup_m3_ipc handle
[ 3.306506] ThumbEE CPU extension supported.
[ 3.310907] Registering SWP/SWPB emulation handler
[ 3.316696] registered taskstats version 1
[ 3.321007] zswap: loaded using pool lzo/zbud
[ 3.325487] mmc1: MAN_BKOPS_EN bit is not set
[ 3.333093] Btrfs loaded
[ 3.337777] mmc1: new high speed MMC card at address 0001
[ 3.352833] mmcblk1: mmc1:0001 MMC04G 3.66 GiB
[ 3.360943] mmcblk1boot0: mmc1:0001 MMC04G partition 1 1.00 MiB
[ 3.372902] mmcblk1boot1: mmc1:0001 MMC04G partition 2 1.00 MiB
[ 3.382115] Key type encrypted registered
[ 3.386431] mmcblk1: p1
[ 3.393892] input: tps65217_pwr_but as /devices/platform/ocp/44e0b000.i2c/i2c-0/0-0024/input/input0
[ 3.425982] tps65217 0-0024: TPS65217 ID 0xe version 1.2
[ 3.431886] at24 0-0050: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[ 3.438883] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 3.446084] at24 2-0054: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[ 3.453452] at24 2-0055: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[ 3.460796] at24 2-0056: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[ 3.468071] at24 2-0057: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[ 3.475034] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
[ 3.481691] remoteproc0: powering up wkup_m3
[ 3.486176] remoteproc0: Booting fw image am335x-pm-firmware.elf, size 219735
[ 3.493771] remoteproc0: remote processor wkup_m3 is now up
[ 3.499467] wkup_m3_ipc 44e11324.wkup_m3_ipc: CM3 Firmware Version = 0x191
[ 3.510959] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,00C0,4414BBBK8674'
[ 3.518288] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4
[ 3.564655] bone_capemgr bone_capemgr: slot #0: No cape found
[ 3.608652] bone_capemgr bone_capemgr: slot #1: No cape found
[ 3.652652] bone_capemgr bone_capemgr: slot #2: No cape found
[ 3.696652] bone_capemgr bone_capemgr: slot #3: No cape found
[ 3.702459] bone_capemgr bone_capemgr: enabled_partno PARTNO 'BB-MIKRO-01' VER 'N/A' PR '0'
[ 3.710865] bone_capemgr bone_capemgr: slot #4: override
[ 3.716218] bone_capemgr bone_capemgr: Using override eeprom data at slot 4
[ 3.723229] bone_capemgr bone_capemgr: slot #4: 'Override Board Name,00A0,Override Manuf,BB-MIKRO-01'
[ 3.732835] bone_capemgr bone_capemgr: initialized OK.
[ 3.740032] PM: bootloader does not support rtc-only!
[ 3.745757] omap_rtc 44e3e000.rtc: setting system clock to 2016-08-17 13:02:05 UTC (1471438925)
[ 3.754629] of_cfs_init
[ 3.757259] of_cfs_init: OK
[ 3.765093] PM: Hibernation image not present or could not be loaded.
[ 3.766300] Freeing unused kernel memory: 600K (c0ac0000 - c0b56000)
[ 4.026255] systemd-udevd[105]: starting version 215
[ 4.039176] random: systemd-udevd urandom read with 24 bits of entropy available
[ 4.741015] bone_capemgr bone_capemgr: loader: failed to load slot-4 BB-MIKRO-01:00A0 (prio 0)
[ 5.009532] EXT4-fs (mmcblk1p1): mounted filesystem with ordered data mode. Opts: (null)
[ 5.416069] systemd[1]: systemd 215 running in system mode. (+PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ -SECCOMP -APPARMOR)
[ 5.429962] systemd[1]: Detected architecture 'arm'.
[ 5.463177] systemd[1]: Set hostname to <arm>.
[ 5.935466] systemd[1]: Cannot add dependency job for unit display-manager.service, ignoring: Unit display-manager.service failed to load: No such file or directory.
[ 5.953727] systemd[1]: Starting Forward Password Requests to Wall Directory Watch.
[ 5.962113] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[ 5.969962] systemd[1]: Expecting device dev-ttyS0.device...
[ 5.985236] systemd[1]: Starting Remote File Systems (Pre).
[ 5.997153] systemd[1]: Reached target Remote File Systems (Pre).
[ 6.003683] systemd[1]: Starting Arbitrary Executable File Formats File System Automount Point.
[ 6.025189] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
[ 6.034922] systemd[1]: Starting Encrypted Volumes.
[ 6.045195] systemd[1]: Reached target Encrypted Volumes.
[ 6.050903] systemd[1]: Starting Dispatch Password Requests to Console Directory Watch.
[ 6.059331] systemd[1]: Started Dispatch Password Requests to Console Directory Watch.
[ 6.067450] systemd[1]: Starting Swap.
[ 6.077112] systemd[1]: Reached target Swap.
[ 6.081650] systemd[1]: Starting Root Slice.
[ 6.093180] systemd[1]: Created slice Root Slice.
[ 6.098129] systemd[1]: Starting User and Session Slice.
[ 6.113170] systemd[1]: Created slice User and Session Slice.
[ 6.119169] systemd[1]: Starting /dev/initctl Compatibility Named Pipe.
[ 6.137183] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
[ 6.144391] systemd[1]: Starting Delayed Shutdown Socket.
[ 6.157115] systemd[1]: Listening on Delayed Shutdown Socket.
[ 6.163132] systemd[1]: Starting Journal Socket (/dev/log).
[ 6.177186] systemd[1]: Listening on Journal Socket (/dev/log).
[ 6.183421] systemd[1]: Starting udev Control Socket.
[ 6.197117] systemd[1]: Listening on udev Control Socket.
[ 6.202850] systemd[1]: Starting udev Kernel Socket.
[ 6.221127] systemd[1]: Listening on udev Kernel Socket.
[ 6.226748] systemd[1]: Starting Journal Socket.
[ 6.237042] systemd[1]: Listening on Journal Socket.
[ 6.242408] systemd[1]: Starting System Slice.
[ 6.253102] systemd[1]: Created slice System Slice.
[ 6.258335] systemd[1]: Started File System Check on Root Device.
[ 6.264583] systemd[1]: Starting system-getty.slice.
[ 6.277182] systemd[1]: Created slice system-getty.slice.
[ 6.282830] systemd[1]: Starting system-serial\x2dgetty.slice.
[ 6.297180] systemd[1]: Created slice system-serial\x2dgetty.slice.
[ 6.303860] systemd[1]: Starting Increase datagram queue length...
[ 6.324541] systemd[1]: Starting Load Kernel Modules...
[ 6.376038] systemd[1]: Started Set Up Additional Binary Formats.
[ 6.386665] systemd[1]: Mounted Huge Pages File System.
[ 6.394179] systemd[1]: Mounting POSIX Message Queue File System...
[ 6.415528] systemd[1]: Starting udev Coldplug all Devices...
[ 6.469096] systemd[1]: Starting Create list of required static device nodes for the current kernel...
[ 6.499634] systemd[1]: Starting Slices.
[ 6.517153] systemd[1]: Reached target Slices.
[ 6.557108] systemd[1]: Starting Remount Root and Kernel File Systems...
[ 6.617089] systemd[1]: Mounted POSIX Message Queue File System.
[ 6.643674] EXT4-fs (mmcblk1p1): re-mounted. Opts: errors=remount-ro
[ 6.653004] systemd[1]: Started Increase datagram queue length.
[ 6.673037] systemd[1]: Started Load Kernel Modules.
[ 6.705051] systemd[1]: Started Create list of required static device nodes for the current kernel.
[ 6.741012] systemd[1]: Started Remount Root and Kernel File Systems.
[ 6.817213] systemd[1]: Started udev Coldplug all Devices.
[ 6.997130] systemd[1]: Started Various fixups to make systemd work better on Debian.
[ 7.005265] systemd[1]: Starting Load/Save Random Seed...
[ 7.021790] systemd[1]: Starting Create Static Device Nodes in /dev...
[ 7.054939] systemd[1]: Mounting FUSE Control File System...
[ 7.087682] systemd[1]: Mounting Configuration File System...
[ 7.141810] systemd[1]: Starting Apply Kernel Variables...
[ 7.183055] systemd[1]: Starting Syslog Socket.
[ 7.201281] systemd[1]: Listening on Syslog Socket.
[ 7.210946] systemd[1]: Starting Journal Service...
[ 7.239328] systemd[1]: Started Journal Service.
[ 7.598734] systemd-udevd[197]: starting version 215
[ 8.264138] systemd-journald[195]: Received request to flush runtime journal from PID 1
[ 9.584584] Installing knfsd (copyright (C) 1996 ok...@monad.swb.de).
[ 9.720319] davinci-mcasp 48038000.mcasp: invalid tdm slots: 0
[ 9.812480] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20
[ 9.917271] davinci-mcasp 4803c000.mcasp: invalid tdm slots: 0
[ 10.278291] random: nonblocking pool is initialized
[ 11.286416] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
[ 11.613462] Bluetooth: Core ver 2.21
[ 11.673029] NET: Registered protocol family 31
[ 11.677570] Bluetooth: HCI device and connection manager initialized
[ 11.751575] Bluetooth: HCI socket layer initialized
[ 11.798040] Bluetooth: L2CAP socket layer initialized
[ 11.852982] Bluetooth: SCO socket layer initialized
[ 12.045391] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
[ 12.173199] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
[ 12.202270] NFSD: starting 90-second grace period (net c0c14840)
[ 13.295364] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 13.300832] Bluetooth: BNEP filters: protocol multicast
[ 13.365213] Bluetooth: BNEP socket layer initialized
[ 14.461863] net eth0: initializing cpsw version 1.12 (0)
[ 14.467260] net eth0: initialized cpsw ale version 1.4
[ 14.591445] net eth0: phy found : id is : 0x7c0f1
[ 14.655928] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 14.779032] using random self ethernet address
[ 14.783613] using random host ethernet address
[ 14.788128] using host ethernet address: 6C:EC:EB:AB:D4:BD
[ 14.793486] using self ethernet address: 6C:EC:EB:AB:D4:B0
[ 14.814881] usb0: HOST MAC 6c:ec:eb:ab:d4:bd
[ 14.830132] usb0: MAC 6c:ec:eb:ab:d4:b0
[ 14.841070] using random self ethernet address
[ 14.845605] using random host ethernet address
[ 14.865984] g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
[ 14.872733] g_ether gadget: g_ether ready
[ 15.160607] IPv6: ADDRCONF(NETDEV_UP): usb0: link is not ready
[ 15.428875] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)
[ 15.436668] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready
[ 17.605951] cpsw 4a100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
[ 17.613941] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 17.690799] 8021q: 802.1Q VLAN Support v1.8
[ 17.695213] 8021q: adding VLAN 0 to HW filter on device eth0
dmesg after enabling it on runtime:
debian@arm:~$ sudo sh -c "echo BB-MIKRO-01 > /sys/devices/platform/bone_capemgr/slots"
debian@arm:~$ dmesg
...
...
...
[ 52.139383] bone_capemgr bone_capemgr: part_number 'BB-MIKRO-01', version 'N/A'
[ 52.147153] bone_capemgr bone_capemgr: slot #5: override
[ 52.152685] bone_capemgr bone_capemgr: Using override eeprom data at slot 5
[ 52.159837] bone_capemgr bone_capemgr: slot #5: 'Override Board Name,00A0,Override Manuf,BB-MIKRO-01'
[ 52.192478] bone_capemgr bone_capemgr: slot #5: dtbo 'BB-MIKRO-01-00A0.dtbo' loaded; overlay id #0
[ 52.244268] CAN device driver interface
[ 52.272904] /ocp/spi@481a0000/can@1: could not find phandle
[ 52.278881] mcp251x: probe of spi2.0 failed with error -2