embeded/ARM2015. 2. 2. 14:53

별거 없네 -_-a

라고 하지만 일단 칩 벤더 패치 먹이는 것 부터가 일단 난관? ㅋㅋㅋ


$ make distclean

$ make -j8 ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- defconfig imx5_defconfig

$ make -j8 ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- 



distclean 하면 .config 까지 날아가서 완전 새로 설정해야 한다.
그리고 help는 해당 아키텍쳐에 대해서만 나오니

$ make help

Cleaning targets:

  clean   - Remove most generated files but keep the config and

                    enough build support to build external modules

  mrproper   - Remove all generated files + config + various backup files

  distclean   - mrproper + remove editor backup and patch files


Configuration targets:

  config   - Update current config utilising a line-oriented program

  nconfig         - Update current config utilising a ncurses menu based program

  menuconfig   - Update current config utilising a menu based program

  xconfig   - Update current config utilising a QT based front-end

  gconfig   - Update current config utilising a GTK based front-end

  oldconfig   - Update current config utilising a provided .config as base

  localmodconfig  - Update current config disabling modules not loaded

  localyesconfig  - Update current config converting local mods to core

  silentoldconfig - Same as oldconfig, but quietly, additionally update deps

  randconfig   - New config with random answer to all options

  defconfig   - New config with default answer to all options

  allmodconfig   - New config selecting modules when possible

  allyesconfig   - New config where all options are accepted with yes

  allnoconfig   - New config where all options are answered with no


Other generic targets:

  all   - Build all targets marked with [*]

* vmlinux   - Build the bare kernel

* modules   - Build all modules

  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)

  firmware_install- Install all firmware to INSTALL_FW_PATH

                    (default: $(INSTALL_MOD_PATH)/lib/firmware)

  dir/            - Build all files in dir and below

  dir/file.[oisS] - Build specified target only

  dir/file.lst    - Build specified mixed source/assembly target only

                    (requires a recent binutils and recent build (System.map))

  dir/file.ko     - Build module including final link

  modules_prepare - Set up for building external modules

  tags/TAGS   - Generate tags file for editors

  cscope   - Generate cscope index

  kernelrelease   - Output the release version string

  kernelversion   - Output the version stored in Makefile

  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH

                    (default: /home/interm/Downloads/linux/linux-2.6.35.3/usr)


Static analysers

  checkstack      - Generate a list of stack hogs

  namespacecheck  - Name space analysis on compiled kernel

  versioncheck    - Sanity check on version.h usage

  includecheck    - Check for duplicate included header files

  export_report   - List the usages of all exported symbols

  headers_check   - Sanity check on exported headers

  headerdep       - Detect inclusion cycles in headers


Kernel packaging:

  rpm-pkg         - Build both source and binary RPM kernel packages

  binrpm-pkg      - Build only the binary kernel package

  deb-pkg         - Build the kernel as an deb package

  tar-pkg         - Build the kernel as an uncompressed tarball

  targz-pkg       - Build the kernel as a gzip compressed tarball

  tarbz2-pkg      - Build the kernel as a bzip2 compressed tarball


Documentation targets:

 Linux kernel internal documentation in different formats:

  htmldocs        - HTML

  pdfdocs         - PDF

  psdocs          - Postscript

  xmldocs         - XML DocBook

  mandocs         - man pages

  installmandocs  - install man pages generated by mandocs

  cleandocs       - clean all generated DocBook files


Architecture specific targets (x86):

* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)

  install      - Install kernel using

                  (your) ~/bin/installkernel or

                  (distribution) /sbin/installkernel or

                  install to $(INSTALL_PATH) and run lilo

  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)

  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)

  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)

  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)

                  bzdisk/fdimage*/isoimage also accept:

                  FDARGS="..."  arguments for the booted kernel

                  FDINITRD=file initrd for the booted kernel


  i386_defconfig           - Build for i386

  x86_64_defconfig         - Build for x86_64


  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build

  make V=2   [targets] 2 => give reason for rebuild of target

  make O=dir [targets] Locate all output files in "dir", including .config

  make C=1   [targets] Check all c source with $CHECK (sparse by default)

  make C=2   [targets] Force check of all c source with $CHECK


Execute "make" or "make all" to build all targets marked with [*] 

For further info see the ./README file 


아키텍쳐를 정해주면 해당 아키텍쳐에 대한 설정이 쭈욱 나온다.

imx5_defconfig 외에는 되는게 없네 -_-

$ make help ARCH=arm

Cleaning targets:

  clean  - Remove most generated files but keep the config and

                    enough build support to build external modules

  mrproper  - Remove all generated files + config + various backup files

  distclean  - mrproper + remove editor backup and patch files


Configuration targets:

  config  - Update current config utilising a line-oriented program

  nconfig         - Update current config utilising a ncurses menu based program

  menuconfig  - Update current config utilising a menu based program

  xconfig  - Update current config utilising a QT based front-end

  gconfig  - Update current config utilising a GTK based front-end

  oldconfig  - Update current config utilising a provided .config as base

  localmodconfig  - Update current config disabling modules not loaded

  localyesconfig  - Update current config converting local mods to core

  silentoldconfig - Same as oldconfig, but quietly, additionally update deps

  randconfig  - New config with random answer to all options

  defconfig  - New config with default answer to all options

  allmodconfig  - New config selecting modules when possible

  allyesconfig  - New config where all options are accepted with yes

  allnoconfig  - New config where all options are answered with no


Other generic targets:

  all  - Build all targets marked with [*]

* vmlinux  - Build the bare kernel

* modules  - Build all modules

  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)

  firmware_install- Install all firmware to INSTALL_FW_PATH

                    (default: $(INSTALL_MOD_PATH)/lib/firmware)

  dir/            - Build all files in dir and below

  dir/file.[oisS] - Build specified target only

  dir/file.lst    - Build specified mixed source/assembly target only

                    (requires a recent binutils and recent build (System.map))

  dir/file.ko     - Build module including final link

  modules_prepare - Set up for building external modules

  tags/TAGS  - Generate tags file for editors

  cscope  - Generate cscope index

  kernelrelease  - Output the release version string

  kernelversion  - Output the version stored in Makefile

  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH

                    (default: /home/interm/Downloads/linux/linux-2.6.35.3/usr)


Static analysers

  checkstack      - Generate a list of stack hogs

  namespacecheck  - Name space analysis on compiled kernel

  versioncheck    - Sanity check on version.h usage

  includecheck    - Check for duplicate included header files

  export_report   - List the usages of all exported symbols

  headers_check   - Sanity check on exported headers

  headerdep       - Detect inclusion cycles in headers


Kernel packaging:

  rpm-pkg         - Build both source and binary RPM kernel packages

  binrpm-pkg      - Build only the binary kernel package

  deb-pkg         - Build the kernel as an deb package

  tar-pkg         - Build the kernel as an uncompressed tarball

  targz-pkg       - Build the kernel as a gzip compressed tarball

  tarbz2-pkg      - Build the kernel as a bzip2 compressed tarball


Documentation targets:

 Linux kernel internal documentation in different formats:

  htmldocs        - HTML

  pdfdocs         - PDF

  psdocs          - Postscript

  xmldocs         - XML DocBook

  mandocs         - man pages

  installmandocs  - install man pages generated by mandocs

  cleandocs       - clean all generated DocBook files


Architecture specific targets (arm):

* zImage        - Compressed kernel image (arch/arm/boot/zImage)

  Image         - Uncompressed kernel image (arch/arm/boot/Image)

* xipImage      - XIP kernel image, if configured (arch/arm/boot/xipImage)

  uImage        - U-Boot wrapped zImage

  bootpImage    - Combined zImage and initial RAM disk

                  (supply initrd image via make variable INITRD=<path>)

  install       - Install uncompressed kernel

  zinstall      - Install compressed kernel

                  Install using (your) ~/bin/installkernel or

                  (distribution) /sbin/installkernel or

                  install to $(INSTALL_PATH) and run lilo


  acs5k_defconfig          - Build for acs5k

  acs5k_tiny_defconfig     - Build for acs5k_tiny

  afeb9260_defconfig       - Build for afeb9260

  am200epdkit_defconfig    - Build for am200epdkit

  am3517_evm_defconfig     - Build for am3517_evm

  ams_delta_defconfig      - Build for ams_delta

  ap4evb_defconfig         - Build for ap4evb

  assabet_defconfig        - Build for assabet

  at572d940hfek_defconfig  - Build for at572d940hfek

  at91cap9adk_defconfig    - Build for at91cap9adk

  at91rm9200dk_defconfig   - Build for at91rm9200dk

  at91rm9200ek_defconfig   - Build for at91rm9200ek

  at91sam9260ek_defconfig  - Build for at91sam9260ek

  at91sam9261ek_defconfig  - Build for at91sam9261ek

  at91sam9263ek_defconfig  - Build for at91sam9263ek

  at91sam9g20ek_defconfig  - Build for at91sam9g20ek

  at91sam9rlek_defconfig   - Build for at91sam9rlek

  ateb9200_defconfig       - Build for ateb9200

  badge4_defconfig         - Build for badge4

  bcmring_defconfig        - Build for bcmring

  cam60_defconfig          - Build for cam60

  carmeva_defconfig        - Build for carmeva

  cerfcube_defconfig       - Build for cerfcube

  cm_t35_defconfig         - Build for cm_t35

  cm_x2xx_defconfig        - Build for cm_x2xx

  cm_x300_defconfig        - Build for cm_x300

  cns3420vb_defconfig      - Build for cns3420vb

  colibri_pxa270_defconfig - Build for colibri_pxa270

  colibri_pxa300_defconfig - Build for colibri_pxa300

  collie_defconfig         - Build for collie

  corgi_defconfig          - Build for corgi

  cpu9260_defconfig        - Build for cpu9260

  cpu9g20_defconfig        - Build for cpu9g20

  cpuat91_defconfig        - Build for cpuat91

  csb337_defconfig         - Build for csb337

  csb637_defconfig         - Build for csb637

  da8xx_omapl_defconfig    - Build for da8xx_omapl

  davinci_all_defconfig    - Build for davinci_all

  devkit8000_defconfig     - Build for devkit8000

  dove_defconfig           - Build for dove

  ebsa110_defconfig        - Build for ebsa110

  ecbat91_defconfig        - Build for ecbat91

  edb7211_defconfig        - Build for edb7211

  em_x270_defconfig        - Build for em_x270

  ep93xx_defconfig         - Build for ep93xx

  eseries_pxa_defconfig    - Build for eseries_pxa

  ezx_defconfig            - Build for ezx

  footbridge_defconfig     - Build for footbridge

  fortunet_defconfig       - Build for fortunet

  g3evm_defconfig          - Build for g3evm

  g4evm_defconfig          - Build for g4evm

  h3600_defconfig          - Build for h3600

  h5000_defconfig          - Build for h5000

  h7201_defconfig          - Build for h7201

  h7202_defconfig          - Build for h7202

  hackkit_defconfig        - Build for hackkit

  htcherald_defconfig      - Build for htcherald

  igep0020_defconfig       - Build for igep0020

  imote2_defconfig         - Build for imote2

  imx23evk_defconfig       - Build for imx23evk

  imx23evk_updater_defconfig - Build for imx23evk_updater

  imx25_3stack_defconfig   - Build for imx25_3stack

  imx25_updater_defconfig  - Build for imx25_updater

  imx28evk_defconfig       - Build for imx28evk

  imx28evk_updater_defconfig - Build for imx28evk_updater

  imx5_defconfig           - Build for imx5

  imx5_updater_defconfig   - Build for imx5_updater

  integrator_defconfig     - Build for integrator

  iop13xx_defconfig        - Build for iop13xx

  iop32x_defconfig         - Build for iop32x

  iop33x_defconfig         - Build for iop33x

  ixp2000_defconfig        - Build for ixp2000

  ixp23xx_defconfig        - Build for ixp23xx

  ixp4xx_defconfig         - Build for ixp4xx

  jornada720_defconfig     - Build for jornada720

  kafa_defconfig           - Build for kafa

  kb9202_defconfig         - Build for kb9202

  kirkwood_defconfig       - Build for kirkwood

  ks8695_defconfig         - Build for ks8695

  lart_defconfig           - Build for lart

  loki_defconfig           - Build for loki

  lpd270_defconfig         - Build for lpd270

  lpd7a400_defconfig       - Build for lpd7a400

  lpd7a404_defconfig       - Build for lpd7a404

  lubbock_defconfig        - Build for lubbock

  lusl7200_defconfig       - Build for lusl7200

  magician_defconfig       - Build for magician

  mainstone_defconfig      - Build for mainstone

  mini2440_defconfig       - Build for mini2440

  mmp2_defconfig           - Build for mmp2

  msm_defconfig            - Build for msm

  mv78xx0_defconfig        - Build for mv78xx0

  mx1_defconfig            - Build for mx1

  mx21_defconfig           - Build for mx21

  mx27_defconfig           - Build for mx27

  mx31pdk_defconfig        - Build for mx31pdk

  mx3_defconfig            - Build for mx3

  mx3_updater_defconfig    - Build for mx3_updater

  mx51_defconfig           - Build for mx51

  n770_defconfig           - Build for n770

  n8x0_defconfig           - Build for n8x0

  neocore926_defconfig     - Build for neocore926

  neponset_defconfig       - Build for neponset

  netwinder_defconfig      - Build for netwinder

  netx_defconfig           - Build for netx

  nhk8815_defconfig        - Build for nhk8815

  ns9xxx_defconfig         - Build for ns9xxx

  nuc910_defconfig         - Build for nuc910

  nuc950_defconfig         - Build for nuc950

  nuc960_defconfig         - Build for nuc960

  omap_2430sdp_defconfig   - Build for omap_2430sdp

  omap_3430sdp_defconfig   - Build for omap_3430sdp

  omap_3630sdp_defconfig   - Build for omap_3630sdp

  omap3_beagle_defconfig   - Build for omap3_beagle

  omap3_defconfig          - Build for omap3

  omap3_evm_defconfig      - Build for omap3_evm

  omap3_pandora_defconfig  - Build for omap3_pandora

  omap3_stalker_lks_defconfig - Build for omap3_stalker_lks

  omap3_touchbook_defconfig - Build for omap3_touchbook

  omap_4430sdp_defconfig   - Build for omap_4430sdp

  omap_apollon_2420_defconfig - Build for omap_apollon_2420

  omap_generic_1510_defconfig - Build for omap_generic_1510

  omap_generic_1610_defconfig - Build for omap_generic_1610

  omap_generic_1710_defconfig - Build for omap_generic_1710

  omap_generic_2420_defconfig - Build for omap_generic_2420

  omap_h2_1610_defconfig   - Build for omap_h2_1610

  omap_h4_2420_defconfig   - Build for omap_h4_2420

  omap_innovator_1510_defconfig - Build for omap_innovator_1510

  omap_innovator_1610_defconfig - Build for omap_innovator_1610

  omap_ldp_defconfig       - Build for omap_ldp

  omap_osk_5912_defconfig  - Build for omap_osk_5912

  omap_perseus2_730_defconfig - Build for omap_perseus2_730

  omap_zoom2_defconfig     - Build for omap_zoom2

  omap_zoom3_defconfig     - Build for omap_zoom3

  onearm_defconfig         - Build for onearm

  orion5x_defconfig        - Build for orion5x

  overo_defconfig          - Build for overo

  palmte_defconfig         - Build for palmte

  palmtt_defconfig         - Build for palmtt

  palmz71_defconfig        - Build for palmz71

  palmz72_defconfig        - Build for palmz72

  pcm027_defconfig         - Build for pcm027

  picotux200_defconfig     - Build for picotux200

  pleb_defconfig           - Build for pleb

  pnx4008_defconfig        - Build for pnx4008

  pxa168_defconfig         - Build for pxa168

  pxa255-idp_defconfig     - Build for pxa255-idp

  pxa3xx_defconfig         - Build for pxa3xx

  pxa910_defconfig         - Build for pxa910

  qil-a9260_defconfig      - Build for qil-a9260

  raumfeld_defconfig       - Build for raumfeld

  realview_defconfig       - Build for realview

  realview-smp_defconfig   - Build for realview-smp

  rpc_defconfig            - Build for rpc

  rx51_defconfig           - Build for rx51

  s3c2410_defconfig        - Build for s3c2410

  s3c6400_defconfig        - Build for s3c6400

  s5p6440_defconfig        - Build for s5p6440

  s5p6442_defconfig        - Build for s5p6442

  s5pc100_defconfig        - Build for s5pc100

  s5pc110_defconfig        - Build for s5pc110

  s5pv210_defconfig        - Build for s5pv210

  sam9_l9260_defconfig     - Build for sam9_l9260

  shannon_defconfig        - Build for shannon

  shark_defconfig          - Build for shark

  simpad_defconfig         - Build for simpad

  spear300_defconfig       - Build for spear300

  spear310_defconfig       - Build for spear310

  spear320_defconfig       - Build for spear320

  spear600_defconfig       - Build for spear600

  spitz_defconfig          - Build for spitz

  stamp9g20_defconfig      - Build for stamp9g20

  stmp378x_defconfig       - Build for stmp378x

  stmp37xx_defconfig       - Build for stmp37xx

  sx1_defconfig            - Build for sx1

  tct_hammer_defconfig     - Build for tct_hammer

  trizeps4_defconfig       - Build for trizeps4

  u300_defconfig           - Build for u300

  u8500_defconfig          - Build for u8500

  usb-a9260_defconfig      - Build for usb-a9260

  usb-a9263_defconfig      - Build for usb-a9263

  versatile_defconfig      - Build for versatile

  viper_defconfig          - Build for viper

  xcep_defconfig           - Build for xcep

  yl9200_defconfig         - Build for yl9200

  zeus_defconfig           - Build for zeus


  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build

  make V=2   [targets] 2 => give reason for rebuild of target

  make O=dir [targets] Locate all output files in "dir", including .config

  make C=1   [targets] Check all c source with $CHECK (sparse by default)

  make C=2   [targets] Force check of all c source with $CHECK


Execute "make" or "make all" to build all targets marked with [*] 

For further info see the ./README file


$ make -j8 ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- uImage

  CHK     include/linux/version.h

  CHK     include/generated/utsrelease.h

make[1]: `include/generated/mach-types.h' is up to date.

  CALL    scripts/checksyscalls.sh

  CHK     include/generated/compile.h

  Kernel: arch/arm/boot/Image is ready

  SHIPPED arch/arm/boot/compressed/lib1funcs.S

  AS      arch/arm/boot/compressed/lib1funcs.o

  LD      arch/arm/boot/compressed/vmlinux

  OBJCOPY arch/arm/boot/zImage

  Kernel: arch/arm/boot/zImage is ready

  UIMAGE  arch/arm/boot/uImage

"mkimage" command not found - U-Boot images will not be built

  Image arch/arm/boot/uImage is ready 


$ mkimage

The program 'mkimage' is currently not installed. You can install it by typing:

sudo apt-get install u-boot-tools


$ sudo apt-get install u-boot-tools


기본으로는 zImage와 Image가 생성되며

uImage는 커널 컴파일시에 uImage로 해야 생성이 된다.



linux-2.6.35.3/arch/arm/boot$ file *Image

Image:  data

uImage: u-boot legacy uImage, Linux-2.6.35.3, Linux/ARM, OS Kernel Image (Not compressed), 2985820 bytes, Sun Feb  1 22:33:13 2015, Load Address: 0x70008000, Entry Point: 0x70008000, Header CRC: 0x0A03D97E, Data CRC: 0x99B88B34

zImage: Linux kernel ARM boot executable zImage (little-endian)


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Posted by 구차니
embeded/ARM2015. 2. 2. 14:48

SD + MA인가 했는데

S + DMA



programmable smart DMA


[링크 : http://cache.freescale.com/files/32bit/doc/data_sheet/IMX53IEC.pdf]

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Posted by 구차니
Programming/php2015. 2. 2. 11:59


IE는 잘되는데 크롬은 안되서 이래저래 검색중




[링크 : http://en.wikipedia.org/wiki/Chunked_transfer_encoding]

[링크 : http://coffeenix.net/board_view.php?bd_code=1280]

[링크 : https://www.fir3net.com/Networking/Protocols/http-what-does-transfer-encoding-chunked-mean.html]

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Programming/php2015. 2. 2. 10:51

define으로 변수를 지정해서 include 하는건 지금사용하는 방법과 같지만

lang[] 이라는 어레이를 이용하니

이게 변수인지 문자열인지 조금은 더 잘 구분이 되니 쓸만해 보이는 방법




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이렇다할 이메일 공지도 없다가

2월 1일 위키에 접속하니 안되서

혹시나 하는 마음에 호스팅 업체 접속을 해보니..


머시라?

-_-



정말 무료라는 이유로

열정페이 짓을 당했구나 싶다.

이런저런 문제점과 몇번이나 데이터 날아가면서 버텼는데..

이렇게 소리소문 없이 유료 전환일줄이야...


굿바이 인트로솔루션




아오... 닝기리 닝기리 -_-

호스팅어 밖에 안남은건가!?



Posted by 구차니

아이패드 2 잘가..

그래도 여자친구에서 아내로 업그레이드 할 동안

19만원 주고 쓴거 치고는 오래 버텨 주었구나 ㅠㅠ

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콘솔에서 보려니 까매서.. 눈에 안보이는 까막눈...



$ svn diff | view -

빔: 표준입력에서 읽는 중...


$ whereis view

view: /usr/bin/view /usr/share/man/man1/view.1.gz

$ ll /usr/bin/view

lrwxrwxrwx 1 root root 22 2014-08-25 16:42 /usr/bin/view -> /etc/alternatives/view*

$ ll /etc/alternatives/view

lrwxrwxrwx 1 root root 18 2014-08-25 16:42 /etc/alternatives/view -> /usr/bin/vim.gnome*


[링크 : http://www.commandlinefu.com/commands/view/2420/colored-svn-diff]

Posted by 구차니

MPEG4 오디오는 크게 AAC-LC와 HE-AAC로 나누어 진다.

확장자나 상품명 content type으로 치면

AAC-LC는 aac로

HE-AAC v1은 aacplus / aacp / aac+

HE-AAC v2는 eAAC+ / enhanced aacPlus / aacPlus v2

이런식으로 갈리는 것으로 보여진다.


VLC에서 확인하면

HE-AAC는 

AAC 확장: SBR 이라는 항목이 추가되어 출력된다.


Low Complexity AAC (AAC LC)

High-Efficiency Advanced Audio Coding (HE-AAC)

    HE-AAC v1 - SBR = aacplus / AAC+ / aacp(?)

    HE-AAC v2 - SBR + PS = Enhanced aacPlus


VersionCommon trade namesCodec featureStandards
HE-AAC v1aacPlus v1, eAAC, AAC+, CT-aacPlusAAC LC + SBRISO/IEC 14496-3:2001/Amd 1:2003
HE-AAC v2aacPlus v2, eAAC+, AAC++, Enhanced AAC+AAC LC + SBR + PSISO/IEC 14496-3:2005/Amd 2:2006


[링크 : http://en.wikipedia.org/wiki/High-Efficiency_Advanced_Audio_Coding]



nero 인코더/디코더를 보면

기본적으로 quality로 설정해서 압축하면 VBR 이며

0.25 quality 정도면(25%) 66kbps 에서

VBR로 대략 40kbps~56kbps 사이에서 데이터가 실제 전송양이 측정될 것으로 예상된다.



[링크 : http://www.nero.com/enu/company/about-nero/nero-aac-codec.php] nero non-commercial

[링크 : http://wiki.multimedia.cx/index.php?title=AAC_Reference_Software#mp4mcDec] official codec

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embeded/ARM2015. 1. 28. 16:41

cortex-A8 / i.MX515 개발환경에서 커널 빌드하려고 패치하고 설정을 보니

CPU 설정에서 다음과 같은 ARM errata 관련 설정이 보인다.


  │ │        [*] ARM errata: Stale prediction on replaced interworking branch               │ │   

  │ │        [*] ARM errata: Processor deadlock when a false hazard is created              │ │  

  │ │        [*] ARM errata: Data written to the L2 cache can be overwritten with stale data│ │  


음.. 이건 ARM/Thumb 섞어서 쓸때 분기문에서 주소 충돌이 나는 버그 같은데..

Thumb를 활성화 안해준다면 크게 걱정안해도 될 버그 같고

  ┌ ARM errata: Stale prediction on replaced interworking branch ───────────────┐

  │ CONFIG_ARM_ERRATA_430973:                                                                 │  

  │                                                                                           │  

  │ This option enables the workaround for the 430973 Cortex-A8                               │  

  │ (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb                          │  

  │ interworking branch is replaced with another code sequence at the                         │  

  │ same virtual address, whether due to self-modifying code or virtual                       │  

  │ to physical address re-mapping, Cortex-A8 does not recover from the                       │  

  │ stale interworking branch prediction. This results in Cortex-A8                           │  

  │ executing the new code sequence in the incorrect ARM or Thumb state.                      │  

  │ The workaround enables the BTB/BTAC operations by setting ACTLR.IBE                       │  

  │ and also flushes the branch target cache at every context switch.                         │  

  │ Note that setting specific bits in the ACTLR register may not be                          │  

  │ available in non-secure mode.                                                             │  

  │                                                                                           │  

  │ Symbol: ARM_ERRATA_430973 [=y]                                                            │  

  │ Prompt: ARM errata: Stale prediction on replaced interworking branch                      │  

  │   Defined at arch/arm/Kconfig:1004                                                        │  

  │   Depends on: CPU_V7 [=y]                                                                 │  

  │   Location:                                                                               │  

  │     -> System Type                                                                        │  

[링크 : http://cateee.net/lkddb/web-lkddb/ARM_ERRATA_430973.html]


매우 특정한 순서의 메모리 연산을 할 경우 캐시 라인이 엉겨서 cpu가 데드락에 빠질수 있다는데.

드물게 죽는(?) 이유가 이 녀석 이었으려나?

  ┌ ARM errata: Processor deadlock when a false hazard is created ──────────────┐

  │ CONFIG_ARM_ERRATA_458693:                                                                 │  

  │                                                                                           │  

  │ This option enables the workaround for the 458693 Cortex-A8 (r2p0)                        │  

  │ erratum. For very specific sequences of memory operations, it is                          │  

  │ possible for a hazard condition intended for a cache line to instead                      │  

  │ be incorrectly associated with a different cache line. This false                         │  

  │ hazard might then cause a processor deadlock. The workaround enables                      │  

  │ the L1 caching of the NEON accesses and disables the PLD instruction                      │  

  │ in the ACTLR register. Note that setting specific bits in the ACTLR                       │  

  │ register may not be available in non-secure mode.                                         │  

  │                                                                                           │  

  │ Symbol: ARM_ERRATA_458693 [=y]                                                            │  

  │ Prompt: ARM errata: Processor deadlock when a false hazard is created                     │  

  │   Defined at arch/arm/Kconfig:1020                                                        │  

  │   Depends on: CPU_V7 [=y]                                                                 │  

  │   Location:                                                                               │  

  │     -> System Type                                                                        │  

[링크 : http://cateee.net/lkddb/web-lkddb/ARM_ERRATA_458693.html]


L2 캐시에 신선한 데이터가 상한 데이터로 바꿔치기 되는 버그.

죽는다고는 안하지만.. 캐시 히트를 못하는 걸까.. 히트했는데 이상한 데이터를 주는 걸까?

  ┌ ARM errata: Data written to the L2 cache can be overwritten with stale data ───────┐

  │ CONFIG_ARM_ERRATA_460075:                                                                 │  

  │                                                                                           │  

  │ This option enables the workaround for the 460075 Cortex-A8 (r2p0)                        │  

  │ erratum. Any asynchronous access to the L2 cache may encounter a                          │  

  │ situation in which recent store transactions to the L2 cache are lost                     │  

  │ and overwritten with stale memory contents from external memory. The                      │  

  │ workaround disables the write-allocate mode for the L2 cache via the                      │  

  │ ACTLR register. Note that setting specific bits in the ACTLR register                     │  

  │ may not be available in non-secure mode.                                                  │  

  │                                                                                           │  

  │ Symbol: ARM_ERRATA_460075 [=y]                                                            │  

  │ Prompt: ARM errata: Data written to the L2 cache can be overwritten with stale data       │  

  │   Defined at arch/arm/Kconfig:1033                                                        │  

  │   Depends on: CPU_V7 [=y]                                                                 │  

  │   Location:                                                                               │  

  │     -> System Type                                                                        │  

[링크 : http://cateee.net/lkddb/web-lkddb/ARM_ERRATA_460075.html]


음.. 요약하면

ACTLR의 특정 레지스터 값은 non-secure mode에서 사용이 불가능해지고

반대로 말하면.. secure mode 라면 발생하지 않을 버그라는 걸까나?

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embeded/ARM2015. 1. 28. 08:39

neon을 쓰기 위해서는 kernel이나 uboot 등에서

FPU/NEON을 활성화 해야 하는 것으로 보인다.


The NEON/VFP unit comes up disabled on power on reset. To enable Neon requires some co-processor commands. Below is the assembly code required to enable NEON/VFP. It is in the gcc type syntax. ARM code tools use a slightly different syntax.


Neon and VFP both support floating point, which should I use?

The VFPv3 is fully compliant with IEEE 754

Neon is not fully compliant with IEEE 754, so it is mainly targeted for multimedia applications


[링크 : http://processors.wiki.ti.com/index.php/Cortex-A8]


A sequence for initializing the VFPU can be found in u-boot source.


.macro init_vfpu

  ldr r0, =(0xF << 20)

  mcr p15, 0, r0, c1, c0, 2

  mov r3, #0x40000000

  .long 0xeee83a10

  /* vmsr FPEXC, r3 */

.endm /* init_vfpu */


[링크 : http://stackoverflow.com/questions/19231197/enable-neon-on-arm-cortex-a-series]


Using the Advanced SIMD and VFP in Secure state and Non-secure state other than Hyp mode

To use the Advanced SIMD and VFP in Secure state and Non-secure state other than Hyp mode, you must first define the NSACR, then define the CPACR and FPEXC registers. See Non-Secure Access Control RegisterCoprocessor Access Control Register, and Floating-Point Exception Register.

  1. Enable Non-secure access to CP10 and CP11 and clear the NSASEDIS bit in the NSACR:

    MRC p15, 0, r0, c1, c1, 2
    
    ORR r0, r0, #(3<<10)	    ; Enable Non-secure access to CP10 and CP11
    
    BIC r0, r0, #(3<<14)	    ; Clear NSASEDIS bit
    
    MCR p15, 0, r0, c1, c1, 2
    
    ISB
    
  2. Enable access to CP10 and CP11 and clear the ASEDIS bit in the CPACR:

    MOV r0, 0x00F00000
    
    MCR p15, 0, r0, c1, c0, 2
    
    ISB
    
  3. Set the FPEXC.EN bit to enable Advanced SIMD and VFP:

    MOV r3, #0x40000000
    
    VMSR FPEXC, r3


Kernel mode NEON

================


Introduction

------------

It is possible to use NEON instructions (and in some cases, VFP instructions) in code that runs in kernel mode. However, for performance reasons, the NEON/VFP register file is not preserved and restored at every context switch or taken exception like the normal register file is, so some manual intervention is required. Furthermore, special care is required for code that may sleep [i.e.,may call schedule()], as NEON or VFP instructions will be executed in a non-preemptible section for reasons outlined below.


[링크 : https://www.kernel.org/doc/Documentation/arm/kernel_mode_neon.txt] 



아무튼.. 커널 패치하고 make ARCH=arm menuconfig 로 살펴보니 Floatting point emulation에

(x86일 기본 make menuconfig에서는 보이지 않음)


이렇게 뚜둥! VFP 하위에 Advanced SIMD(NEON)이라고 똭!


머. 도움말은 별거 없다.

[링크 : http://cateee.net/lkddb/web-lkddb/NEON.html]

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