Problem disabling cache on ARM926ej-s

Started by flashzr in AT91SAM ARM6 years ago 4 replies

I've been using mmu.c to setup my MMU table and enable the caches - for months now, so I think that part is OK. Now I need to disable the...

I've been using mmu.c to setup my MMU table and enable the caches - for months now, so I think that part is OK. Now I need to disable the icache, dcache and mmu, do some stuff and re-enable them. But when I disable the cache, the prog starts to behave like it has a will of its own. If I don't disable the cache, then it works normally. Please take a look... [code] // creates a mmu l...


AT91sam9xe512 - Internal Flash got erased at powerup

Started by raja_mahendra10 in AT91SAM ARM6 years ago 1 reply

Hi All We have developed a custom board based on at91sam9xe512 chip. With sam-ba2.10 I can enable internal flash access, Reading and writing...

Hi All We have developed a custom board based on at91sam9xe512 chip. With sam-ba2.10 I can enable internal flash access, Reading and writing to internal flash is also working.The problem is when I poweroff and poweron the board, the internal flash content got erased. We have checked that the ERASE pin is maintained "Low"..still internal flash got erased. Appreciate your help on this issue...


AT91sam9261 - linux does not execute an elf file.

Started by Paulo Carvalho Silva in AT91SAM ARM6 years ago 3 replies

Hi, I have the following problem: The at91sam9261ek kit, Atmel does not send the sources in CD, I hate this. So I download and compile, the...

Hi, I have the following problem: The at91sam9261ek kit, Atmel does not send the sources in CD, I hate this. So I download and compile, the bootstrap, u-boot and kernel, the kernel is booting ok, but I neew graphical interface, as I am a newbie to graphical interface I realise that will be easy if I copy all files that belongs to graphica interface from filesystem that Atmel mount whe...


getting started with SAM3U-EK

Started by Rafael in AT91SAM ARM7 years ago

Hi people, I'm starting in the study of Arm-Cortex processors and I choose the ATMEL SAM3U microcontroler. I have a lot of experience with...

Hi people, I'm starting in the study of Arm-Cortex processors and I choose the ATMEL SAM3U microcontroler. I have a lot of experience with others microcontrolers (aka PIC24, 8051, Z80, 68000, AVR) ans now I'm looking for ARM Cortex microcontrolers. I already read a lot of documentations, tutorials and I got started to try to run some examples and tests in SAM3U-EK board. I started with ...


Returning from ISR erases my local variables. What am I doing wrong?

Started by "evan.miller530" in AT91SAM ARM7 years ago 1 reply

I'm using an at91sam7s256 combined with the yagarto/eclipse gnu toolchain, with an ISR setup based on the PIT. After the first interrupt fires,...

I'm using an at91sam7s256 combined with the yagarto/eclipse gnu toolchain, with an ISR setup based on the PIT. After the first interrupt fires, it enters the ISR, executes a few lines of code, then returns to the main loop. The problem I seem to be having is that all local variables/pointers have been reverted back to their reset values (0xAAAA....) once I've returned from the ISR, and the ISR...


SAM-BA isn't modifying values, what am I doing wrong here

Started by "evan.miller530" in AT91SAM ARM7 years ago 3 replies

I have recently installed AT91-ISP v1.12, and am trying to modify memory on my AT91SAM7S256 using SAM-BA. The problem I am having is after...

I have recently installed AT91-ISP v1.12, and am trying to modify memory on my AT91SAM7S256 using SAM-BA. The problem I am having is after connecting, SAM-BA doesn't modify memory values in the internal flash or ram. When I send a file, changes are not made, and similarly when I try to manually change a single memory value, the changes are not made. I have followed the instructions for loading ...


AT91SAM7S256-Program pitfalls

Started by anil kumar in AT91SAM ARM7 years ago 1 reply

hi everyone. this is anil, currently persuing M-Tech(Embedded systems). I would like to take part in this group. currently i'm working as an...

hi everyone. this is anil, currently persuing M-Tech(Embedded systems). I would like to take part in this group. currently i'm working as an intern in Thotaka Technologies pvt ltd. presently i'm doing a project, based on AT91SAM7S256 controller. Recently i tried to program on at91sam7s256 using H-JTAG with parallel port. At first the target was detected.But when i tried to program it...


FreeRTOS help needed

Started by sAm in AT91SAM ARM7 years ago 2 replies

Hi guys.. i am working on FreeRTOS kernel and stuck in creating my first task.. i am not sure that it is the right place to get help but i know...

Hi guys.. i am working on FreeRTOS kernel and stuck in creating my first task.. i am not sure that it is the right place to get help but i know for sure that u guys know much about FreeRTOS. i have modified the port of Microblaze to fit my architecture for AEMB. So basically my kernel now has no hardware setup and i want to kick my tasks using the cooperative mode.. so far i have already mad...


help connecting STM32-P107 with ARM-USB-Tiny-H

Started by Richard Leenheer in AT91SAM ARM7 years ago 1 reply

hello, I am kinda new with using development boards, and the last couple of days I am trying to play with the device I bought. But I am not able...

hello, I am kinda new with using development boards, and the last couple of days I am trying to play with the device I bought. But I am not able to acually program something in the device. I am working with Windows XP, SP3, 32bit The device I bought was from Olimex, : STM32-P107 with the JTAG cable: ARM-USB-Tiny-H I followed the instructions in the manual on the cd. It installes Eclipse...


ISI Image Sensor, anyone working on Linux code?

Started by Tobias Weber in AT91SAM ARM7 years ago 3 replies

Hi all, I got a fine running 2.6.30 on my AT91SAm9G45 dev board here (Embest) and would like to use the Image Sensor Interface. So far, I was...

Hi all, I got a fine running 2.6.30 on my AT91SAm9G45 dev board here (Embest) and would like to use the Image Sensor Interface. So far, I was unable to find any linux support for this peripheral. Is there something that could be tested (even alpha-code is welcome) or is someone already working on an implementation of this? I would really help on this, but I never worked on kernel driv...


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