구차니의 잡동사니 모음

$ cat /proc/cpuinfo

processor       : 0

model name      : ARMv7 Processor rev 5 (v7l)

BogoMIPS        : 38.40

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

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xc07

CPU revision    : 5 

 Port 2 

 Port 4

 LAN (Port 1)

 Port 3 

 Port 5 

login as: ubuntu

ubuntu@192.168.219.165's password:

Welcome to Ubuntu Vivid Vervet (development branch) (GNU/Linux 3.18.3-v7+ armv7l)

 * Documentation:  https://help.ubuntu.com/

The programs included with the Ubuntu system are free software;

the exact distribution terms for each program are described in the

individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by

applicable law.

Welcome to the Ubuntu Core rolling development release.

 * See https://ubuntu.com/snappy

It's a brave new world here in snappy Ubuntu Core! This machine

does not use apt-get or deb packages. Please see 'snappy --help'

for app installation and transactional updates.

To run a command as administrator (user "root"), use "sudo <command>".

See "man sudo_root" for details.

ubuntu@localhost:~$ sudo apt-get update

Ubuntu Core does not use apt-get, see 'snappy --help'!

ubuntu@localhost:~$ snappy

Usage:snappy [-h] [-v]

             {info,versions,search,update-versions,update,rollback,install,uninstall,tags,config,build,booted,chroot,framework,fake-version,nap}

             ...

ubuntu@localhost:~$ snappy update

This command needs root, please run with sudo

ubuntu@localhost:~$ sudo snappy update

Traceback (most recent call last):

  File "/usr/bin/snappy", line 25, in <module>

    status = Main().__main__()

  File "/usr/lib/python3/dist-packages/snappy/main.py", line 195, in __main__

    return callback(args)

  File "/usr/lib/python3/dist-packages/snappy/main.py", line 511, in _do_update

    for pkg in ClickDataSource().upgradable_apps]

  File "/usr/lib/python3/dist-packages/snappy/click.py", line 180, in upgradable_apps

    all_updates_list = repo.get_upgradable()

  File "/usr/lib/python3/dist-packages/click/repository.py", line 183, in get_upgradable

    headers={"content-type": "application/json"})

  File "/usr/lib/python3/dist-packages/click/network.py", line 70, in http_request

    curl.perform()

pycurl.error: (60, 'server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none')

Soft

• Full software floating point - compiler should refuse to generate a real FPU instruction and -mfpu= is ignored.
• FPU operations are emulated by the compiler
• Function calls are generated to pass FP arguments (float, double) in integer registers (one for float, a pair of registers for double)

Softfp

• To reiterate, function calls are generated to pass FP arguments in integer registers
• Compiler can make smart choices about when and if it generates emulated or real FPU instructions depending on chosen FPU type (-mfpu=)
• This means soft and softfp code can be intermixed

Hardfp

• Full hardware floating point.
• FP arguments are passed directly in FPU registers
• Cannot possibly run without the FPU defined in -mfpu= (or a superset of the FPU defined, where relevant)
• FPU instructions could be emulated by the kernel so that FPU-less systems could run with this ABI but as far as we know this does not exist
• No function prologue or epilogue requirements for FP arguments, no pipeline stalls, maximum performance (just like in PowerPC and MIPS)

[링크 : https://wiki.debian.org/ArmHardFloatPort/VfpComparison]

################################################################################

#      This file is part of OpenELEC - http://www.openelec.tv

#      Copyright (C) 2009-2014 Stephan Raue (stephan@openelec.tv)

#      Inspired and partly copied from:

#  http://youresuchageek.blogspot.fr/2012/09/howto-raspberry-pi-openelec-on.html

#

#  OpenELEC is free software: you can redistribute it and/or modify

#  it under the terms of the GNU General Public License as published by

#  the Free Software Foundation, either version 2 of the License, or

#  (at your option) any later version.

#

#  OpenELEC is distributed in the hope that it will be useful,

#  but WITHOUT ANY WARRANTY; without even the implied warranty of

#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#  GNU General Public License for more details.

#

#  You should have received a copy of the GNU General Public License

#  along with OpenELEC.  If not, see <http://www.gnu.org/licenses/>.

################################################################################

# Bootloader configuration - config.txt

################################################################################

################################################################################

# Memory (System/GPU configuration )

################################################################################

# default GPU memory split (do not change if you do not know what you are doing)

  gpu_mem=128

# SDRAM size based GPU memory split, uncomment and setup to override 'gpu_mem'

  gpu_mem_256=112

  gpu_mem_512=160

  gpu_mem_1024=256

################################################################################

# Overclocking settings

# WARNING: Do not change/enable if you do not know what you are doing!

#          The System may become unstable or you can have data corruption or

#          you can loose your warranty if you set wrong settings

#

# please read: http://elinux.org/RPi_config.txt#Overclocking_configuration

################################################################################

# Overclock mode settings.

#

# default recommended values are: arm_freq | core_freq | sdram_freq | over_voltage

# no overclocking               :    700   |    250    |    400     |      0

# mode 'Modest'                 :    800   |    300    |    400     |      0

# mode 'Medium'                 :    900   |    333    |    450     |      2

# mode 'High'                   :    950   |    450    |    450     |      6

# mode 'Turbo'                  :   1000   |    500    |    500     |      6

# arm_freq=700

# core_freq=250

# sdram_freq=400

# over_voltage=0

# set to 'force_turbo=1' to disable dynamic overclocking (you can lose your warranty!)

  force_turbo=0

# If you have any data corruption using Turbo Mode and overclocking

# try with this setting uncommented

# If this still fails, try to use Medium mode without "over_voltage=2"

# If it ultimately keeps failing, forget about this until it gets fixed

# Use a more conservative mode that will works fine in any cases:

# initial_turbo=30

################################################################################

# Overscan settings

################################################################################

# Make display smaller to stop text spilling off the screen

# see also http://www.raspberrypi.org/phpBB3/viewtopic.php?f=67&t=15700

# overscan_scale=1

# disable_overscan=1

# Adapt overscan values to your needs

# overscan_left=57

# overscan_right=59

# overscan_top=20

# overscan_bottom=20

################################################################################

# various settings see also: http://elinux.org/RPi_config.txt

################################################################################

# Force HDMI even if unplugged or powered off

# hdmi_force_hotplug=1

# Doesn't sent initial active source message.

# Avoids bringing CEC (enabled TV) out of standby and channel switch when

# rebooting.

  hdmi_ignore_cec_init=1

################################################################################

# License keys to enable GPU hardware decoding for various codecs

# to obtain keys visit the shop at http://www.raspberrypi.com

################################################################################

# decode_MPG2=0x00000000

# decode_WVC1=0x00000000

# decode_DTS=0x00000000

# decode_DDP=0x00000000

################################################################################

# End of default configuration

# all values below this line were inserted from config.txt.bk (your old config)

# and can be merged with the above values

################################################################################ 

hdmi_group defines the HDMI type

Not specifying the group, or setting to 0 will use the preferred group reported by the edid.

hdmi_group=1   CEA

hdmi_group=2   DMT

[링크 : http://elinux.org/RPiconfig]