구차니의 잡동사니 모음

$ dtc -@ -I dts -O dtb -o 1st-overlay.dtb 1st-overlay.dts

$ fdtdump 1st-overlay.dtb

/dts-v1/;

// magic:           0xd00dfeed

// totalsize:       0x106 (262)

// off_dt_struct:   0x38

// off_dt_strings:  0xe8

// off_mem_rsvmap:  0x28

// version:         17

// last_comp_version:    16

// boot_cpuid_phys: 0x0

// size_dt_strings: 0x1e

// size_dt_struct:  0xb0

/ {

    compatible = "brcm,bcm2708";

    fragment@0 {

        target = <0xdeadbeef>;

        __overlay__ {

            status = "okay";

        };

    };

    __fixups__ {

        i2s = "/fragment@0:target:0";

    };

};

[링크 : https://www.raspberrypi.org/documentation/configuration/device-tree.md] 

$ LD_SHOW_AUXV=1 ls

AT_HWCAP:    half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt

AT_PAGESZ:       4096

AT_CLKTCK:       100

AT_PHDR:         0x10034

AT_PHENT:        32

AT_PHNUM:        9

AT_BASE:         0x76fae000

AT_FLAGS:        0x0

AT_ENTRY:        0x13a6d

AT_UID:          1000

AT_EUID:         1000

AT_GID:          1000

AT_EGID:         1000

AT_SECURE:       0

AT_RANDOM:       0x7eb85e2f

AT_HWCAP2:       0x0

AT_EXECFN:       /bin/ls

AT_PLATFORM:     v7l 

    *** At least one emulation must be selected ***

[*] VFP-format floating point maths                

[ ]   Advanced SIMD (NEON) Extension support     

$ LD_SHOW_AUXV=1 ls

AT_HWCAP:    half thumb fastmult vfp edsp vfpv3 tls vfpv4 idiva idivt

AT_PAGESZ:       4096

AT_CLKTCK:       100

AT_PHDR:         0x10034

AT_PHENT:        32

AT_PHNUM:        9

AT_BASE:         0x76f84000

AT_FLAGS:        0x0

AT_ENTRY:        0x13a6d

AT_UID:          1000

AT_EUID:         1000

AT_GID:          1000

AT_EGID:         1000

AT_SECURE:       0

AT_RANDOM:       0x7edf9e2f

AT_HWCAP2:       0x0

AT_EXECFN:       /bin/ls

AT_PLATFORM:     v7l 

$ cat /proc/cpuinfo

processor       : 0

model name      : ARMv7 Processor rev 5 (v7l)

BogoMIPS        : 38.40

Features        : half thumb fastmult vfp edsp vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xc07

CPU revision    : 5 

Your current Hardware Enablement Stack (HWE) is no longer supported

since 2014-08-07.  Security updates for critical parts (kernel and graphics stack) of your system are no longer available.

For more information, please see:

http://wiki.ubuntu.com/1204_HWE_EOL

There is a graphics stack installed on this system. An upgrade to a

supported (or longer supported) configuration will become available

on 2014-07-16 and can be invoked by running 'update-manager' in the Dash.

$ cat /proc/cpuinfo

processor       : 0

vendor_id       : GenuineIntel

cpu family      : 6

model           : 58

model name      : Intel(R) Celeron(R) CPU G1610 @ 2.60GHz

stepping        : 9

microcode       : 0x12

cpu MHz         : 1600.000

cache size      : 2048 KB

physical id     : 0

siblings        : 2

core id         : 0

cpu cores       : 2

apicid          : 0

initial apicid  : 0

fpu             : yes

fpu_exception   : yes

cpuid level     : 13

wp              : yes

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer xsave lahf_lm arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms

bogomips        : 5188.23

clflush size    : 64

cache_alignment : 64

address sizes   : 36 bits physical, 48 bits virtual

power management: 

$ cat /etc/hostname

devmini 

$ cat /etc/hosts

127.0.0.1       localhost

127.0.1.1       devmini

# The following lines are desirable for IPv6 capable hosts

::1     ip6-localhost ip6-loopback

fe00::0 ip6-localnet

ff00::0 ip6-mcastprefix

ff02::1 ip6-allnodes

ff02::2 ip6-allrouters 

$ iwconfig --help

Usage: iwconfig [interface]

                interface essid {NNN|any|on|off}

                interface mode {managed|ad-hoc|master|...}

                interface freq N.NNN[k|M|G]

                interface channel N

                interface bit {N[k|M|G]|auto|fixed}

                interface rate {N[k|M|G]|auto|fixed}

                interface enc {NNNN-NNNN|off}

                interface key {NNNN-NNNN|off}

                interface power {period N|timeout N|saving N|off}

                interface nickname NNN

                interface nwid {NN|on|off}

                interface ap {N|off|auto}

                interface txpower {NmW|NdBm|off|auto}

                interface sens N

                interface retry {limit N|lifetime N}

                interface rts {N|auto|fixed|off}

                interface frag {N|auto|fixed|off}

                interface modulation {11g|11a|CCK|OFDMg|...}

                interface commit

       Check man pages for more details.

$ iwconfig

wlan0     IEEE 802.11bgn  ESSID:off/any

          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm

          Retry short limit:7   RTS thr:off   Fragment thr:off

          Power Management:off

lo        no wireless extensions.

eth0      no wireless extensions.

eth0      no wireless extensions.