Weird clock signal on dataread (AT91SAM9260)

Started by Anonymous in comp.arch.embedded13 years ago 1 reply

I tried posting this once before but I think it was rejected because of inline images, i'll try posting it again with links to the images: I...

I tried posting this once before but I think it was rejected because of inline images, i'll try posting it again with links to the images: I have a 6 layered sam9260 board and I'm seeing something strange on the 18Mhz clock. This is a scan from the SAM9260-EK (reference) board, when there's any data written to the dataflash, a probe on the crystal shows this pattern. (notice the slight...


AT91RM9200 bootloaders (to boot into u-boot)

Started by Darrell Harmon in comp.arch.embedded16 years ago 2 replies

I have a board based on the AT91RM9200, and want to boot from SPI dataflash. The loader will proceed to boot u-boot (Which is too big for the...

I have a board based on the AT91RM9200, and want to boot from SPI dataflash. The loader will proceed to boot u-boot (Which is too big for the ROM bootloader to handle). I have read the atmel appnote on that, but boot program will need to be changed. My SDRAM is configured differently than the DK. The program with the appnote includes source, but it is missing quite a bit to be able to be ...


Weird clock behaviour on dataread (AT91SAM9260)

Started by Anonymous in comp.arch.embedded13 years ago

I have a 6 layered sam9260 board and I'm seeing something strange on the 18Mhz clock. This is a scan from the SAM9260-EK (reference) board,...

I have a 6 layered sam9260 board and I'm seeing something strange on the 18Mhz clock. This is a scan from the SAM9260-EK (reference) board, when there's any data written to the dataflash, a probe on the crystal shows this pattern. (notice the slightly raised ground, which then stabilizes and continues. [URL=http://img121.imagevenue.com/img.php?image=44891_ek- normal_122_731lo.JPG][IMG]h...


Position independent code with position dependent data ?

Started by nono240 in comp.arch.embedded10 years ago 23 replies

Hi there ! My CPU has no MMU, very little RAM (8KB), and is running a modified FreeRTOS. I'd like to have the ability to "load" and run some...

Hi there ! My CPU has no MMU, very little RAM (8KB), and is running a modified FreeRTOS. I'd like to have the ability to "load" and run some code from USART/DATAFLASH to FLASH as a RTOS task. Of course, for convenience, the compiled code must be fully position independent. Using the -fPIC or -fpic option, looking at the assembler, the code seems OK : a dynamically computed offset is applie...


at91rm9200 Board gets reset spontaneously

Started by Mayank Kaushik in comp.arch.embedded15 years ago 2 replies

Hi , Im trying to build a Development board for the AT91RM9200 and am using SDRAM in 16 bit mode , and 2 Mb Flash. I have managed to Store...

Hi , Im trying to build a Development board for the AT91RM9200 and am using SDRAM in 16 bit mode , and 2 Mb Flash. I have managed to Store U-boot in the Dataflash and to get it to boot from it. The Atmel Utility picks up U-boot from the Flash and runs it from SDRAM. The problem im having is that spontaneously while running , the System automatically Resets. This was not happening prior ...


SPI as secondary storage on ARM dev kit?

Started by Mayank Kaushik in comp.arch.embedded15 years ago 2 replies

Hi, Im trying to build a dev kit for the AT91rm9200, and have linux running on the final board. However, due to the unavailability of buffers...

Hi, Im trying to build a dev kit for the AT91rm9200, and have linux running on the final board. However, due to the unavailability of buffers for the parallel flash, i can only use the SPI DataFlash for storage, and this is where the OS would reside. If anyone out here has the At91rm9200-Dk or Ek, can you tell me where (in parallel or spi flash) is the OS stored, and what is the remainin...


Serial Flash

Started by Jack in comp.arch.embedded12 years ago 6 replies

For an application I need to store a large amount of data (ca. 3MB). A serial flash could be a good idea (I don't need to erase very often, and...

For an application I need to store a large amount of data (ca. 3MB). A serial flash could be a good idea (I don't need to erase very often, and if I erase, I will erase all the data at once). I found Atmel's products. But there is a problem: Atmel produces 2 types of serial flash: Serial Flash and DataFlash(r). What's the difference? Any other suggestion (producer, kind of memory,...) ar...


Looking for large serial EEPROM or FLASH like Atmel's DataFlash

Started by Tom in comp.arch.embedded16 years ago 7 replies

I'm looking for a large serial EEPROM or FLASH chip that comes in a small package and uses a serial interface. I need something in the range of...

I'm looking for a large serial EEPROM or FLASH chip that comes in a small package and uses a serial interface. I need something in the range of 1024 kbit - 2048 kbit in an 8-SOIC or smaller package, and it needs to be as cheap as possible. :) So far I've only found I2C EEPROMs like the 24C512, but these only seem to go up to 512 kbit or 1024 kbit, and they also get very expensive when y...


Interface Freescale MC9S08Gxx with Atmel DataFlash / Serial Flash ??

Started by ch in comp.arch.embedded13 years ago

Hi, I am currently working on a project that requires me to interface an existing platform to an external memory, for additional storage....

Hi, I am currently working on a project that requires me to interface an existing platform to an external memory, for additional storage. Below is a block diagram of what I intend to do. [PC serial port] [existing platform board] [Serial Flash] The reason of interfacing with my existing board to a serial flash is that, the current embedded flash on the MC9S08GB uC is insuffic