After working with the ARM instruction set for a bit after heavy X86 work in the past, I'm pondering something for the CIL AOT/JIT compiler I'm working on. My intermediate representation is a fixed-width expansion of the CIL byte code with a couple extra opcodes. Here's an example of a situation that arises in the JIT, and two possible s...
Hi, I have a problem probably with my arm toolchain but maybe there's something other that I do wrong. I have Chinese made dev board qq2440 using Samsung s3c2440 ARM9 uC. I'm using Ubuntu x86 with native gcc(4.3.3) and cross-compile version arm-unknown-linux-uclibc-gcc (crosstool-NG-1.3.2) 4.3.2 I followed tutorials from http://blog.le...
I'm preparing myself to build RTOS solution on top of Linux this going to work on embedded device. I've done some investigation by myself but still I'm a bit confused. Those are my criteria: Easy to run on Samsung s3c2440 ARM9 machine Open Source Works together with Linux Good community support I've seen RTLinux and Xenomai. Xenomai...
I'm building a kernel for an ARM platform running uClinux 2.4 and under "General Setup" in the Linux configuration there is an option called "m68knommu-style attached romfs in RAM support". My ARM assembly skills are somewhat limited but as far as I can tell if I enable this option the ROMFS is copied to the end of the kernels BSS. What...
I want to reinterpret cast a function pointer into a void* variable. The type of the function pointer will be of type Class* (*)(void*). Below is the sample code, class Test { int a; }; int main() { Test* *p(void **a); void *f=reinterpret_cast<void*>(p); } The above code works well with Visual Studio/x86 compilers. B...
ARMv6 introduce a great feature - unaligned memory access, which make some things in code much more simplier and faster. But microsoft gives API for it only in winCE6. And most PDAs now based on WinMobile6 (which is on CE 5.x). And unaligned access is disabled by default :( I've try to set unaligned flag in CP15 register, but this doesn...
For fun, I'm working on a compiler for a small language, and I'm targeting the ARM instruction set first due to its ease. Currently, I'm able to compile the code so I have ARM machine code for the body of each method. At this point I need to start tying a few things together: What format should I persist my machine code to so I can... ...
Hi Friends, I want to profile my code on arm 9, Is there any profiler which can give me function call timings and total cycles taken by each function? I would prefer any free profiler. I loved to work with kcachegrind in linux. Thanks, Sunny. ...
I'm debugging some odd ARM exceptions in an embedded system using the IAR workbench toolchain. Sometimes, when an exception is trapped the SVC_STACK is reported as out of range (very out of range!) Is this relevant, or just an artifact of the J-Link JTAG debugger? What is the SVC_STACK used for? It is set to 0x1000 size, but when it is o...
So I'm getting a "prefetch abort" exception on our arm9 system. This system does not have an MMU, so is there anyway this could be a software problem? All the registers seem correct to me, and the code looks right (not corrupted) from the JTAG point of view. Right now I'm thinking this is some kind of hardware issue (although I hate to ...
So now I understand that I'm getting a ARM Data Abort exception - I see how to trap the exception itself (a bad address in the STL library), but I would like to walk back up the stack frame before the exception. I'm using the IAR toolchain, and it tells me the call stack is unavailable after the exception - is there a trick way to convin...
Hi Friends, I am working on embedded device with 266 Mhz processor and 32 Bit bus and 480x272 screen. we want to play fullscreen video with 1024 kbps Bitrate and 24 fps. Is there any video file format which is bigger in size but fast to decode than H263 and H264. Thanks, Sunny. ADDED I am using processor version ARM926EJS, Arch is...
I'm getting an Undefined Instruction error while running an embedded system, no coprocessor, no MMU, Atmel 9263. The embedded system has memory in the range 0x20000000 - 0x23FFFFFF. I've had two cases so far: SP 0x0030B840, LR 2000AE78 - the LR points at valid code, so I'm not sure what causes the exception, although the SP is bogus. W...
What could possibly cause this weird python behaviour? Python 2.6.2 (r262:71600, May 31 2009, 03:55:41) [GCC 3.3.4] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> .1 1251938906.2350719 >>> .1 0.23507189750671387 >>> .1 0.0 >>> .1 -1073741823.0 >>> .1 -1073741823.0 >>> .1 -1073741823.0 >>> It gives...
Hi Friends, I am using embedded-linux for device which has Arch ARMv5 Speed 266MHZ, vfpu and 32bit bus, 32MB 133 Mhz DDR Ram. can you tell me which windowing system should I use, 1).QT for embedded linux 2). Android. 3). Other!! Well, I am using microwindows for last one year and not satisfied with it as it does not have BSP (Binary...
Hi Friends, I am using ARM926EJS. I am getting 20 % more memory speed in memory copy test, without Linux ( Just as a Getting Started executable). But in linux same code is running 20% slower. Code is /// Below code just performs burst mode memcopy test. void asmcpy(void *a, void *b, int iSize) { do { asm volatile ( ...
We have a simple architecture : Main chip (arm9 based) PIC controller The PIC communicates to ARM via an interrupt based I2C communication protocol for transfer of data. Inside the interrupt we signal a task which reads the data from the I2C layer (bus). In case the data is limited we usually won't have much problem to read the data...
I'm doing a project on image processing using ARM. I have with me an AT91SAM9263 with Linux ported in it. I would like to know what are the image processing libraries which can be used? And what are the other toolsets required? I'm a newbie in this field. ...
Hi Friends, I want to port Android on the device with ARM9 200Mhz and no-fpu support, Is this possible, Has google revealed all code of android or it is just available to partners? if ANDROID_PORT_POSSIBLE { Is there any tutorial available for porting? } Thanks and Regards, Sunny. ...
Hi I'm trying to get started with the STM32 (Cortex-M3) and my plan is get this working from Ubuntu (9.04 / AMD64). To start with I got the Olimex stm32-h103 header board and the Olimex ARM-USB-OCD jtag, and on to of that I will probably use OpenOCD, gcc and Eclipse. But right now I'm looking into what version of gcc to use and how ...