Finding one's way through references to Arm processors is not always obvious. This article is the first of a series on Arm fundamentals that will introduce various topics to help you get more familiar with the Arm architecture. It aims at helping…
Finding one's way through references to Arm processors is not always obvious. This article is the first of a series on Arm fundamentals that will introduce various topics to help you get more familiar with the Arm architecture. It aims at helping…
Arm is a 32-bit CPU architecture where every instruction is 32 bits long. Any constants which are part of an instruction must be encoded within the 32 bits of the given instruction and this naturally limits the range of constants that can be represented…
Hello,
I'm using an ARMv8 processor in 32 bit ARMv7 compatibility mode.
I would like to know if there is any difference (performance gain) in ARMv8 running in AArch32 mode Vs running the same on an an ARMv7.
Thanks!
This document demonstrates how to call the JNI, through a procedure :
The procedure will be…
Hi,
I have some bare metal code written for Arm cortex A9. I would like to port this code to cortex R7. Since both of them belong to ARMv7, How much effort will this take?
I have never worked on cortex R processors. Will i be able to use the same assembly…
Hi there,
I have been going through a lot of ARMv8 documents, and I have a very basic question:
-Can I take a Linux Kernel, compiled for a ARMv7 device, and run it on an ARMv8 device in Aarch32 execution mode?
( Lets assume that the two SOCs are identical…
Hi Experts,
Is there any document on general software guidelines in reducing the cache miss rate in the system for ARMV7 architectures ?
If it is more specific to A/R/M then its great..
Hi experts,
I really get confused with the page table cachability bit (c bit) effect (Cortex-A8) and need your help to find answer of my question. The questions is whether page table C-bit only controls writing/updating into the cache(inner or outer) lines…
Dear All,
Technical data sheets for the ARM7500FE and ARM7100 say that:
"In the ARM Processor the cache will be searched regardless of the state of the C bit, only reads that miss the cache will be affected."
Now the question is that whether…
for ARMv7 architecture:What happens if an interrupt occurs as it is already disabled
hi, experts:
i am studying ARMv7 ARM.pdf's Part C: Debug Architecure.
In Chapter C8.1.3, it described :
Software can access DBGDSCRext, DBGDTRRXext, and DBGDTRTXext through:
.the CP14 interface:
— in v7 Debug it is IMPLEMENTATION DEFINED if these…
I'm compiling an Android kernel for my Xperia Z using Linaro GCC 4.9. My question is, which option gives better optimization -mcpu=cortex-a15 or -march=armv7ve? Or do they give the same results?
I have started working on TI's ARM based Soc and wanted to know how to design secure boot ?
Is implementation of Secure boot is part of first stage boot-loader Rom boot loader ?
I have gone through the below link as well
Can anyone…
"the Security Extensions integrate hardware security features into the architecture". Please can anybody make clear what exactly is "security" in hardware point of view in an ARMv7-A profile..?
can you please give any real-time example…
I am new to ARM architecture and trying to understand ARMv7 pipelining.I am comfortable with armv7 instruction set
Can anyon provied me simple example for operation ARMv7 pipeline with simple instrction?
Thanks
Amit
Hi all,
Is there any document related to the branch predictor algorithm utilized in the ARMV7 and ARMV8 and how the software (ABI) can be aptly developed ac-complying the same ?
Hi all,
In ARMv-7 the co-processor register is used to configure the TCM, cache, MMU, MPU, etc.
In ARMv-8 the co-processor logic is removed and integrated as the system register. Is there any performance difference by doing that ?
In software there are often cases where you need to have critical interrupts serviced. For example, for:
With the ARMv7-M architecture this can be achieved using nested interrupt handlers, but…
“This content was initially posted 27 September 2013 on blogs.arm.com”
Contemporary ARM® architecture (ARMv7, the upcoming ARMv8) offers advanced CPU features like MMU, multi-level cache, TLB, multi core, hardware coherency and similar, which…
This application note is intended to help you migrate software applications from ARMv5 to ARMv7-A/R. It describes the differences between ARMv5 and ARMv7, and explains the issues involved in migrating an existing software application from ARMv5 to ARMv7…
The ARM Cortex-A7 MPCore processor is the most energy efficient application processor that ARM has ever developed and has dramatically extended ARM’s low-power leadership in entry level smart phones, tablets and other high end mobile devices. Here…
In recent articles, I’ve overviewed the ARMv7 architecture and then looked in more detail at ARMv7-A (ARMv7-A - Power to the People) and ARMv6-M/ARMv7-M (ARMv6-M vs ARMv7-M - Unpacking the Microcontrollers). You will recall that there are three…