• a appropriate CortexA15 development board

    geekfolk
    geekfolk

    I am looking for a appropriate CortexA15 development board. If the price is less than $1000, or even $500, so much the better

    Does anyone have the suggestion with such board?

    Thank you!

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Multi Core and Boot Loader

    Victor Mehta
    Victor Mehta

    Would this group be able to answer some multi arm core and boot loader questions that we have ?

    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • SP805 Watchdog Timer

    Jam
    Jam

    Hi,

    I am writing a driver for watchdog timer for my custom platform, what I am observing is, as counter 1st time reaches to zero , then it generates an interrupt and ISR is called

    1. if I clear this interrupt in ISR then counter is reloaded and continue…
    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Problem with understanding memory barriers and problem of barriers taking too long time to execute in ARM Cortex-A15 corepack

    Arif Erman Kulunyar
    Arif Erman Kulunyar

    Hello community and experts,

    I am having a troubled time to understand the memory barriers. The further I read, the further I am being paranoid about the speculative reads and cpu re-ordering.

    I will have some questions and I will really appreciate any…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • How many cycles requires the instruction QBNE?

    Alex
    Alex

    QBNE (Quick branch not equal)

    Using the PRU in the Beaglebone black (AM335x 1GHz ARM® Cortex-A8) I am asking how many cycles requires the instruction QBNE?

    qbeq myLabel, r1, 0

    I suppose two if the comparison is false: one is for compare and one is for…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Cortex 32b/64b processors with Data Trace capability?

    Andreas Koch
    Andreas Koch

    Hello all,

    do any of the faster application processors (Cortex-A9 and up) have data trace capabilities enabled in their on-chip debug logic? I have been looking at both Xilinx and Altera Cortex-A9 cores, and both of them appear to only provide instruction…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Kernel page table makes page fault although other core already mapped.

    Yeo Reum Yun
    Yeo Reum Yun

    Hi, expert. I'm making CacheFlush function by Virtual Address.

    I'm using TTBR0 for user area, and TTBR1 for Kernel Area, and I'm using Dual core, Cortex-A9

    I'm using Cache Flush Policy as Write Through about Kernel PageTable (Below KPT) itself…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • how should a FPGA engineer learn ARM based micro processors?

    vikasp
    vikasp

    Dear all,

    I am an engineer who is doing signal processing on xilinx FPGAs. I am familiar with C/VHDL/MATLAB. However I want to learn ARM based micro-processors. I know very little about processors and their architecture. Absolutely no practical experience…

    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Why does the ARM A15 processor have so many DVFS levels ?

    Kiran Chandramohan
    Kiran Chandramohan

    For eg. the A15 on the Samsung Exynos 5422 has around 19 DVFS levels which varies frequencies from 200MHz to 2GHz.

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • How to start ARM Programming???

    Praveen Ganiger
    Praveen Ganiger


    Dear All,

           I am new to Arm Processors, I don't know how to start Arm Programming and Application development, can anybody help me? I have working experience on DSP Processor, and Microcontroller, which is the best low cost Arm Processor for personal…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • How to get the secure(or non-secure) state on Cortex-A53?

    Brian Kim
    Brian Kim

    Could anyone give me the code to get the current secure state?

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Using the whole Cortex-A L2 Cache without external memory

    Laurent
    Laurent

    I'm thinking about using a cortex-a7 in "bare-metal" where I don't need much memory, so i'd like to avoid using external memory.

    The CPU boots from an external 4MBytes SPI NOR FLASH chip.

    It has 512 KBytes of L2 cache and 32 KBytes…

    • over 5 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • cortex A9 multi-core

    guqintai
    guqintai

    I'm learning cortex-a9 on freescale imx6 platform. How to start multi-core? And how to communicate between cores? I'm confused.

    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • which ARM version that i should use for PLC

    houssam
    houssam

    hello !

    i am houssam an electrical engineering student, i am new to this forum and new for ARM processore i want to make my own PLC (programable logic controler), and i need a processore for to build this PLC, i find a lot of type of ARM processore (cortex…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Barriers in in-order cores like cortex-A53, A7

    oootha
    oootha

    Hi experts!

    As you know, power efficient arm like cortexA7, A53 has in-order pipleline.
    However as far as I understanding, Barriers like dmb, dsb, isb are related with out-of-order memory access.
    But barriers are even used in in-order cpus.
    What is for?
    Can…

    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • How to configure L2 cache in Cortex-A7

    Cherma Rajan
    Cherma Rajan

    Hi all,

    I am working on OrangePi board. The board configuration is,

    • Quad-Core ARM Cortex-A7, 1.6 GHz
    • 32 KB L1 I-Cache and 32 KB L1 D-Cache per core
    • 512 KB L2-Cache

    I have few queries related to Cache memory,

    1. How to disable L2 cache of Cortex-A7 in…
    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • CORTEX-A processor interrupt handling

    Girish Raghavendran
    Girish Raghavendran

    Since I am currently reading lot of ARM documents to understand the architecture as a whole, I request you to mention as to what happens in case of CORTEX-A processor in the nested interrupt handler implementation since we have a SPSR in CORTEX-A processors…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • TZASC (TZC380) enabling sequence

    Vincent Siles
    Vincent Siles

    Hi everyone, I am trying to correctly setup the TZASC of my IMX6q and IMX6ul boards, without blowing the fuse (I only have one board, I'd like to have it right by software before).

    From what I gathered from the documentation of the TZASC and from the…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Cannot access EL1 resources from EL3 or secure world on armv8.

    Tgn Yang
    Tgn Yang

    The working secerio is that I'm testing OP-TEE on a Hikey board(Cortex-A53, armv8), and they use arm-trusted-firmware(see https://github.com/linaro-swg/arm-trusted-firmware) to be the monitor running in EL3.

    I'm trying to access some resources in EL1…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • How to configure Cortex-A57 PMU

    Michael
    Michael

    I asked this question in a different community space but it seemed like this is a more appropriate home.

    I'm trying to configure the performance counters for the Cortex-A57 and I'm very confused. The technical reference manual alludes to accesses being…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • What is differene between cortex A, Cortex M and Cortex R series of ARM?

    tanveermalik
    tanveermalik

    Hi everyone,

    I want to start learning microcontrollers and embedded linux? I want to ask what is differene between A, R and M series of ARM microcontroller? Kindly also suggest me a good book to start learning ARM microcontroller? Which board should I…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Need to invalidate L1 cache after DMA on Cortex A9

    Rohan
    Rohan

    Hi,

    I'm using a Renesas RZ/A1L, Cortex A9 microcontroller. After a DMA operation which transfers some data from a SPI module into RAM, I can't read the data correctly unless I've disabled L1 cache. (The base code which Renesas supplies sets the caches…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • What does PMCEID0_EL0 determine for the the PMU? Performance monitor config

    Michael
    Michael

    The TRM for the a-57 states that PMCEID0_EL0: Defines which common architectural and common micro-architectural feature events are implemented. PMCEID1_EL0 is a continuation of this list. If a bit position is a "1" that means the even is implemented…

    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • Embedded assembly function problem

    Andrea
    Andrea

    Hello all,

    I wrote end embedded assembly function for an ARM Cortex A9 (the specific device is Zynq, from Xilinx) as follow

    float my_fun(float x)

    {

                    asm volatile ("vdup.f32 d0, r0                     \n\t");…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
  • SGIs in AMP Configuration with Non-SMP Linux /RTOS

    Shafique
    Shafique

    I am trying to run two Cortex-A7s in AMP configuration with Linux running on one core (SMP disabled) and baremetal/RTOS running on other core. I am having difficulty in setting up SGIs (IPIs) between the two cores. I am at a point where both of the cores…

    • Answered
    • over 4 years ago
    • Processors
    • Cortex-A / A-Profile forum
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