구차니의 잡동사니 모음

exynos의 위력인가 odroid 계열이 성능은 꽤 좋은데 가격이 안드로메다라 문제지..

U3를 구해왔는데.. pi3 보다 성능은 좋지만 가격은 최소 2배 그리고 단종 ㅋ

[링크 : http://wiki.glidernet.org/cpu-boards]

JTAG TRACER라고 해서 먼가 찾다 보니 ETM 이라는 단어 출몰

실시간으로 CPU의 데이터를 모니터링 할 수 있다는데 그래서 드럽게 비싼듯

(물론 아날로그나 디지털 probe 포함이라 일종의 오실로스코프 역활도 해서 그런가?)

ARM Embedded Trace Macrocell (ETM) modules

[링크 : https://en.wikipedia.org/wiki/JTAG]

segger 사의 j-link(jtag)과 j-flash(굽는거)

ulink나 ulink2와 달리 독립형 프로그램이 존재함.

[링크 : https://www.segger.com/jlink-flash-download.html]

ARM 공식인듯 한데

ulink ulink2는 KEIL MDK와 통합되어 있고

그로 인해 uvision이 아니면 굽기가 힘들다.

콘솔에서 굽는 우회법이 있긴하나 양산에 쓰긴 무리일테고

flashmagictool 툴은 라이센스상

개발용으로 허용, 양산용으로는 부적합

[링크 : http://www.keil.com/forum/9369/stand-alone-ulink-programmer-needed/]

[링크 : http://www.flashmagictool.com/]

[링크 : http://itempage3.auction.co.kr/DetailView.aspx?ItemNo=A615866847]

집에 있는 DS213j가 armv7 계열인데

문득 보다 보니 feature에 neon이 없는걸 발견

> cat /proc/cpuinfo

Processor       : Marvell PJ4Bv7 Processor rev 1 (v7l)

BogoMIPS        : 1196.85

Features        : swp half thumb fastmult vfp edsp vfpv3 vfpv3d16 tls

CPU implementer : 0x56

CPU architecture: 7

CPU variant     : 0x1

CPU part        : 0x581

CPU revision    : 1

Hardware        : Marvell Armada-370

Revision        : 0000

Serial          : 0000000000000000

엥? 375는 neon 첨가! 370은 없어영~ 라고?!?!

The Armada 375 resembles the Armada 370, which has one of Marvell’s ARMv7-compatible PJ4 cores running at 1.2GHz. Although this home-grown CPU is clocked 20% faster than the 375’s Cortex-A9 cores, it lacks Neon extensions and has a less capable version of the VFP unit.

[링크 : http://www.linleygroup.com/newsletters/newsletter_detail.php?num=5010]

흐음...

pull up/down 저항이 낮아서 문제가 되려나?

[링크 : http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/p/348680/1220668]

[링크 : http://www.alteraforum.com/forum/archive/index.php/t-32059.html]

[링크 : https://www.lpcware.com/content/faq/lpcxpresso/debug-design]

[링크 : http://www.support.code-red-tech.com/CodeRedWiki/HardwareDebugConnections] 조만간 폭파

[링크 : http://www.keil.com/support/man/docs/ulink2/ulink2_hw_connectors.htm]

[링크 : http://forum.falinux.com/zbxe/?document_srl=796669...]

음.. JTAG없이 SWD만으로 하는데

SWD로 안되면.. 머가 문제일려나..

TCK/TMS 인식인가..?

How do I switch the debugger connection between JTAG and SWD (Serial Wire Debug) protocol?

Applies to: Debug Access Port (DAP)

Answer

The SWJ-DP component supports both protocols - Serial Wire and JTAG. The selector is part of the SWJ-DP.

The default protocol at power-up is JTAG, so if you want to use Serial Wire, you need to use the TCK and TMS pins to scan in a special 'key', which is a sequence of TMS values which has no effect for a pure JTAG TAP but is recognized by a SWJ-DP TAP as a request to switch into Serial Wire mode. Similarly, there is another another TMS sequence to switch back from SWD to JTAG protocol.

[링크 : http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka11775.html]

음.. 문서도 같이 있으려나?

[링크 : https://github.com/beagleboard]

[링크 : http://elinux.org/Building_BBB_Kernel]

확실히. SIMD쪽이 DSP 보다는 명령어가 먼가.. 파워풀 해보이는 기분?

ARM9 dsp

[링크 : http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dvi0022a/ar01s02s14.html]

ARM11 simd

[링크 : http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0301h/Caccebch.html]

Parallel add /subtract

Sign/zero extend and add

Signed multiply and multiply, accumulate

Saturate, select, and pack

[링크 : http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491i/CJADHCJE.html]

그나저나..ARM11의 SIMD 명령어 셋 목록 구하기 어렵네..

무슨 차이가 있나 보려고 했더니..

ARMv6 SIMD Features:

 75% performance increase for audio and video processing

 Simultaneous computation of 2x16-bit or 4x8-bit operands

 Fractional arithmetic

 User definable saturation modes (arbitrary word-width)

 Dual 16x16 multiply-add/subtract 32x32 fractional MAC

 Simultaneous 8/16-bit select operations

 Performance up to 3.2 GOPS at 800MHz

 Performance is achieved with a "near zero" increase in power consumption on a typical implementation

[링크 : http://www.arm.com/products/processors/technologies/dsp-simd.php]

[링크 : http://elinux.org/images/4/40/Elc2011_anderson_arm.pdf]

[링크 : https://web.eecs.umich.edu/~prabal/teaching/eecs373-f10/readings/ARM_Architecture_Overview.pdf]

오예 찾았다

__qadd16 intrinsic

__qadd8 intrinsic

__qasx intrinsic

__qsax intrinsic

__qsub16 intrinsic

__qsub8 intrinsic

__sadd16 intrinsic

__sadd8 intrinsic

__sasx intrinsic

__sel intrinsic

__shadd16 intrinsic

__shadd8 intrinsic

__shasx intrinsic

__shsax intrinsic

__shsub16 intrinsic

__shsub8 intrinsic

__smlad intrinsic

__smladx intrinsic

__smlald intrinsic

__smlaldx intrinsic

__smlsd intrinsic

__smlsdx intrinsic

__smlsld intrinsic

__smlsldx intrinsic

__smuad intrinsic

__smuadx intrinsic

__smusd intrinsic

__smusdx intrinsic

__ssat16 intrinsic

__ssax intrinsic

__ssub16 intrinsic

__ssub8 intrinsic

__sxtab16 intrinsic

__sxtb16 intrinsic

__uadd16 intrinsic

__uadd8 intrinsic

__uasx intrinsic

__uhadd16 intrinsic

__uhadd8 intrinsic

__uhasx intrinsic

__uhsax intrinsic

__uhsub16 intrinsic

__uhsub8 intrinsic

__uqadd16 intrinsic

__uqadd8 intrinsic

__uqasx intrinsic

__uqsax intrinsic

__uqsub16 intrinsic

__uqsub8 intrinsic

__usad8 intrinsic

__usada8 intrinsic

__usax intrinsic

__usat16 intrinsic

__usub16 intrinsic

__usub8 intrinsic

__uxtab16 intrinsic

__uxtb16 intrinsic.

[링크 : http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491i/CJADHCJE.html]