구차니의 잡동사니 모음

$ tty

/dev/pts/1

$ screen

$ tty

/dev/pts/6

ctrl-a,c

$ tty

/dev/pts/7

ctrl-a,n

window change

ctrl-a,d detach

[detached from 4014.pts-1.odroid_1]

// detach 시에는 다른 창을 만들어 두었더라도 전부 같이 떨어진다.

$ ps -ef | grep -i screen

odroid    4014     1  0 11:49 ?        00:00:00 SCREEN

$ screen -r

reattach

                       Screen key bindings, page 1 of 2.

                       Command key:  ^A   Literal ^A:  a

  break       ^B b         license     ,            removebuf   =

  clear       C            lockscreen  ^X x         reset       Z

  colon       :            log         H            screen      ^C c

  copy        ^[ [         login       L            select      '

  detach      ^D d         meta        a            silence     _

  digraph     ^V           monitor     M            split       S

  displays    *            next        ^@ ^N sp n   suspend     ^Z z

  dumptermcap .            number      N            time        ^T t

  fit         F            only        Q            title       A

  flow        ^F f         other       ^A           vbell       ^G

  focus       ^I           pow_break   B            version     v

  hardcopy    h            pow_detach  D            width       W

  help        ?            prev        ^H ^P p ^?   windows     ^W w

  history     { }          quit        \            wrap        ^R r

  info        i            readbuf     <            writebuf    >

  kill        K k          redisplay   ^L l         xoff        ^S s

  lastmsg     ^M m         remove      X            xon         ^Q q

                  [Press Space for next page; Return to end.]

                       Screen key bindings, page 2 of 2.

^]   paste .

"    windowlist -b

-    select -

0    select 0

1    select 1

2    select 2

3    select 3

4    select 4

5    select 5

6    select 6

7    select 7

8    select 8

9    select 9

I    login on

O    login off

]    paste .

|    split -v

:kB: focus prev

                        [Press Space or Return to end.]  

$ ps -ef | grep -i screen

odroid    4014     1  0 11:49 ?        00:00:00 SCREEN

odroid   17153  1554  0 11:57 pts/1    00:00:00 screen -r 

$ screen -r

There is a screen on:

        4014.pts-1.odroid_1     (22/10/16 11:49:14)     (Attached)

There is no screen to be resumed. 

$ screen -r

There are several suitable screens on:

        24631.pts-12.odroid_1   (22/10/16 12:02:24)     (Detached)

        4014.pts-1.odroid_1     (22/10/16 11:49:13)     (Detached)

Type "screen [-d] -r [pid.]tty.host" to resume one of them. 

$ ps -ef | grep -i screen

odroid    4014     1  0 11:49 ?        00:00:00 SCREEN

odroid   24631     1  0 12:02 ?        00:00:00 SCREEN

GPU acceleration on the Chromium Web browser

/etc/chromium-browser/default

CHROMIUM_FLAGS=" --use-gl=egl --ignore-gpu-blacklist --disable-accelerated-2d-canvas --num-raster-threads=2"

Slow window moving

menu/settings/Default applications for LXSession –> Core applications –> Windows manager –> metacity

Note that, the metacity doesn't support the short-cut keys well. 

The SAMA5D3 provides up to 24 bits of ECC code per sector of 512 or 1024 bytes. Table 1-1 provides the number of ECC bytes required depending on the number of errors to correct. 

Hamming

A 512B data block consists of 4096 (2^12) bits, thus a Hamming code requires 24 parity bits.

Reed-Solomon

An RS over a 512B data block consisting of 9-bit symbols capable of supporting 8 symbol correction would require 2*9*8, or 144 bits of parity.

BCH

Blocksize ECC Level ECC Bits ECC Bytes

512B ECC 8 13*8=104 13

512B ECC 16 13*16=208 26

1024B ECC 24 14*24=336 42

1024B ECC 40 14*40=560 70 

NOTE:

• Windows 8/8.1/10 are NOT supported in PL-2303HXA and PL-2303X EOL chip versions.
• Run PL2303 CheckChipVersion tool program in Windows XP/Vista/7 to check chip version.
• Windows XP, 2000, 98 and Windows ME driver technical support is discontinued.
• Prolific recommends to use PL-2303HXD (HX Rev D) or PL2303TA chip.

Device using PL-2303 H/HXA/HX/X version chips

Driver Version: 3.3.2.102

Driver Date: 09/29/08

Supported device ID and product strings: . VID_067B&PID_2303 for "Prolific USB-to-Serial Comm Port" 

Please be warned that counterfeit (fake) PL-2303HX (Chip Rev A) USB to Serial Controller ICs using Prolific's trademark logo, brandname, and device drivers, were being sold in the China market. Counterfeit IC products show exactly the same outside chip markings but generally are of poor quality and causes Windows driver compatibility issues (Yellow Mark Error Code 10 in Device Manager). We issue this warning to all our customers and consumers to avoid confusion and false purchase. 

OK

U-Boot 2010.12-svn (May 12 2014 - 15:05:46) for Exynox4412

CPU: S5PC220 [Samsung SOC on SMP Platform Base on ARM CortexA9]

APLL = 1000MHz, MPLL = 880MHz

DRAM:  2 GiB

PMIC VERSION : 0x00, CHIP REV : 3

TrustZone Enabled BSP

BL10version: 20121128

Checking Boot Mode ... EMMC4.41

REVISION: 2.0

Manufacture ID 0x11 [ 7456MB ]

NAME: S5P_MSHC4

MMC Device 0: 7456 MB

MMC Device 1: 14804 MB

MMC Device 2 not found

*** Warning - using default environment

USB3503 NINT = OUTPUT0LOW!

ModeKey Check... run normal_boot

No ethernet found.

Hit any0key to stop autoboot:  0

Exynos4412 # boot

do_fat_cfgload : cmd = fatload mmc 0:1 0x41000000 boot.ini

reading boot.ini

** Unable0to read file boot.ini **

NAME: S5P_MSHC4

NAME: S5P_MSHC4

>>> Load Boot Script from mmc 0:1 <<<

reading boot.scr

Warning : Reads a file that is smaller than the cluster size.

355 bytes read in 46 ms (6.8 KiB/s)

##0Executing script at 40008000

reading zImage

** Unable to read file zImage **

reading0uInitrd

Warning : Reads a file that is smaller than the cluster size.

64 bytes read in 32 ms (2 KiB/s)

## Booting kernel from Legacy Image at 40008000 ...

   Image0Name:  0

  0Image Type:   ARM Linux Script (uncompressed)

   Data Size:    291 Bytes = 291 Bytes

  0Load Address: 00000000

   Entry Point:  00000000

   Contents:

   0 0Image 0: 283 Bytes = 283 Bytes

0 0Verifying Checksum ... OK

Wrong Image Type for bootm command

ERROR: can't get kernel image!

Exynos4412 # 

Exynos44120# pri

baudrate=115200

bootargs=fb_x_res=1280 fb_y_res=720 hdmi_phy_res=720

bootcmd=    cfgload; mmc rescan 0:1; mmc rescan 0:2;  if run loadbootscript_1;

bootdelay=1

bootscript=source 40008000

cfg_file_name=boot.ini

cfg_load_base_mem=41000000

cfg_load_device=0

cfg_load_partition=1

cfg_load_partition_type=fat

copy_uboot_emmc2sd=emmc open 0;movi r z f 0 40000000;emmc close 0;movi0w f 1 40;

copy_uboot_sd2emmc=movi r f 0 40000000;emmc open 1;movi w z f 1 40000000;emmc c;

default_bootcmd=echo0>>> Run Default Bootcmd <<<;movi read kernel 0 40008000;mo0

erase_uboot_env=mmc write 0 0x40008000 0x977 0x20;

ethaddr=00:40:5c:26:0a:5b

extra_arg_0=0

extra_arg_1=0

extra_arg_2=0

extra_arg_3=0

gatewayip=192.168.0.1

ipaddr=192.168.0.20

loadbootscript_1=echo >>> Load Boot Script from mmc 0:1 <<<;fatload mmc 0:1 400r

loadbootscript_2=echo >>> Load Boot Script from mmc 0:2 <<<;fatload mmc 0:20400r

netmask=255.255.255.0

serverip=192.168.0.10

usb_invert_clken=0

Environment size: 1706/16380 bytes 

$ find ./ -name zImage

./arch/arm/boot/zImage 

$ sudo apt-get install gcc-4.7

$ gcc-4.7 -v

Using built-in specs.

COLLECT_GCC=/usr/bin/gcc-4.7.real

COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.7/lto-wrapper

Target: arm-linux-gnueabihf

Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.3-12ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-gnu-unique-object --disable-libmudflap --disable-libitm --enable-plugin --with-system-zlib --enable-objc-gc --with-cloog --enable-cloog-backend=ppl --disable-cloog-version-check --disable-ppl-version-check --enable-multiarch --enable-multilib --disable-sjlj-exceptions --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb --disable-werror --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf

Thread model: posix

gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1)

asm() doesn't seem to work with -std=c99. It's a bad idea in my opinion, since the standard actually suggests that compilers support an asm() keyword, but it isn't mandatory. 

Try -std=gnu99

-std=

Determine the language standard. This option is currently only supported when compiling C or C ++ .

The compiler can accept several base standards, such as c89 or c++98, and GNU dialects of those standards, such as gnu89 or gnu++98. By specifying a base standard, the compiler will accept all programs following that standard and those using GNU extensions that do not contradict it. For example, -std=c89 turns off certain features of GCC that are incompatible with ISO C90, such as the "asm" and "typeof" keywords, but not other GNU extensions that do not have a meaning in ISO C90, such as omitting the middle term of a "?:" expression. On the other hand, by specifying a GNU dialect of a standard, all features the compiler support are enabled, even when those features change the meaning of the base standard and some strict-conforming programs may be rejected. The particular standard is used by -pedantic to identify which features are GNU extensions given that version of the standard. For example -std=gnu89 -pedantic would warn about C ++ style // comments, while -std=gnu99 -pedantic would not.

A value for this option must be provided; possible values are

c89

iso9899:1990

Support all ISO C90 programs (certain GNU extensions that conflict with ISO C90 are disabled). Same as -ansi for C code.

iso9899:199409

ISO C90 as modified in amendment 1.

c99

c9x

iso9899:1999

iso9899:199x

ISO C99. Note that this standard is not yet fully supported; see <http://gcc.gnu.org/gcc-4.4/c99status.html> for more information. The names c9x and iso9899:199x are deprecated.

gnu89

GNU dialect of ISO C90 (including some C99 features). This is the default for C code.

gnu99

gnu9x

GNU dialect of ISO C99. When ISO C99 is fully implemented in GCC , this will become the default. The name gnu9x is deprecated.

c++98

The 1998 ISO C ++ standard plus amendments. Same as -ansi for C ++ code.

gnu++98

GNU dialect of -std=c++98. This is the default for C ++ code.

c++0x

The working draft of the upcoming ISO C ++ 0x standard. This option enables experimental features that are likely to be included in C ++ 0x. The working draft is constantly changing, and any feature that is enabled by this flag may be removed from future versions of GCC if it is not part of the C ++ 0x standard.

gnu++0x

GNU dialect of -std=c++0x. This option enables experimental features that may be removed in future versions of GCC .