cortex-a8 Questions
2
Solved
I'm writing bare metal code (no OS), for an ARM Cortex A9 processor.
I need to read a register which is only accessible on supervisor mode (the multiprocessor affinity register, MPIDR).
When I'm ...
4
Solved
I'm writing code targeting ARM Cortex-A on Android devices (using GNU assembler and compiler), and I'm trying to interface between Assembly and C. In particular, I'm interested in calling functions...
Astraea asked 7/12, 2011 at 20:45
1
Solved
5
Solved
I'm working on Cortex-A8 and Cortex-A9 in particular. I know that some architectures don't come with integer division, but what is the best way to do it other than convert to float, divide, convert...
Roos asked 1/12, 2011 at 20:45
2
Solved
When i look through u-boot source code, i found that it pass global data through r9 register like this
register volatile gd_t *gd asm ("r9")
So, i'm curious, how does u-boot ensure further codes...
2
Solved
I'm using S5PV210 which is based on ARM cortex-A8
When i declare a interrupt routine like this:
void isr_routine(void) __attribute__ ((interrupt ("IRQ")));
And compile like this
arm-linux-gcc ...
4
Solved
I'm using an ARM Cortex-A8 based processor called as i.MX515. There is linux Ubuntu 9.10 distribution. I'm running a very big application written in C and I'm making use of gettimeofday(); function...
Frater asked 14/7, 2010 at 14:52
2
I'm using a Exynos 3110 processor (1 GHz Single-core ARM Cortex-A8, e.g. used in the Nexus S) and try to measure execution times of particular functions. I have an Android 4.0.3 running on the Nexu...
Exhilaration asked 20/3, 2012 at 21:18
1
I have found in my actual program for ARM CortexA8 with linux a following issue:
´*** glibc detected *** ./PRUssExternal: double free or corruption (top): 0x00024fe8 ***´
I`m searching for that ...
Ambi asked 4/6, 2013 at 14:34
1
Solved
I am really a new starter to Cortex A and I am aware the ARM applies weakly-ordered memory model, and there are three mutually exclusive memory types:
Strongly-ordered
Device
Normal
I roughly und...
3
Solved
I need to run Java applications on top of Linux on my Beaglebone. I know that ARM cores do have support for Jazelle technology to execute Java bytecode in hardware. Anyway it is not clear to me wha...
4
Solved
In ARM Cortex-A8 processor, I understand what NEON is, it is an SIMD co-processor.
But is VFP(Vector Floating Point) unit, which is also a co-processor, works as a SIMD processor? If so which one ...
1
Solved
If you see this popular pipeline diagram of ARM Cortex-A8 given in one of ARM presentations. It is clear that the instruction fetch stage takes 3 cycles, yet the first cycle is sort of discounted. ...
3
Solved
Might look similar to: ARM and NEON can work in parallel?, but its not, I have some other issue ( may be problem with my understanding):
In the protocol stack, while we compute checksum, that is d...
2
Solved
Refering to @auselen's answer here: Using ARM NEON intrinsics to add alpha and permute, looks like armcc compiler is far more better than the gcc compiler for NEON optimizations. Is this really tru...
1
Solved
This is with reference to question:
Checksum code implementation for Neon in Intrinsics
Opening the sub-questions listed in the link as separate individual questions. As multi questions aren't to...
Pyrites asked 5/9, 2012 at 8:37
1
Solved
I'm trying to implement the checksum computation code(2's complement addition) for NEON, using intrinsic. The current checksum computation is being carried out on ARM.
My implementation fetches 12...
2
Solved
I'm developing an iOS app that needs to convert images from RGB -> BGRA fairly quickly. I would like to use NEON intrinsics if possible. Is there a faster way than simply assigning the components?
...
Arnica asked 9/8, 2012 at 19:56
4
Solved
There is a big (~100 000) array of floating point variables, and there is a threshold (also floating point).
The problem is that I have to compare each one variable from the array with a threshold...
3
Solved
Learning about ARM NEON intrinsics, I was timing a function that I wrote to double the elements in an array.The version that used the intrinsics takes more time than a plain C version of the functi...
2
Solved
I'm working on writing several real-time DSP algorithms on Android, so I decided to program the ARM directly in Assembly to optimize everything as much as possible and make the math maximally light...
Trooper asked 8/11, 2011 at 17:4
5
Solved
2
Solved
I've recently encountered a strange behaviour of ARM Cortex-A8 when programming it in Assembly. Whenever I MOV anything into R4, my program crashes (stack dump below)
10-14 09:48:43.117: INFO/DEBU...
Apprise asked 14/10, 2011 at 14:4
1
Solved
I'm using Cortex-A8 processor and I'm not understanding how to use the -mfpu flag.
On the Cortex-A8 there are both vfpv3 and neon co-processors. Previously I was not knowing how to use neon so I w...
Outhaul asked 18/11, 2010 at 10:2
1
© 2022 - 2024 — McMap. All rights reserved.