Hello everyone, I have been working with an AT91RM9200-EK board for a couple of months now and we are about to make our own custom board. Lately I started investigating about U-Boot and how it works in this board and, though I have found a lot of bits of information, I am still quite confused. I would like to ask about U-Boot running from RAM. On the one hand, I have seen links [1] and [2] that say that it should not be done but, on the other hand, from the documentation from Atmel [3] I see it _is_ being run from RAM. I have done this myself with u-boot 1.1.6 defining CONFIG_SKIP_LOWLEVEL_INIT at the top of include/configs/at91rm9200dk.h, otherwise it wouldn't work. I found out about this define here [4] For what I gather from the instructions from Atmel, there is always a bootloader before U-Boot, loading it from the dataflash, serial port or Flash and this could explain why I must define CONFIG_SKIP_LOWLEVEL_INIT, so that the hardware is not initialized twice. Would it work to put an uncompressed image of U-Boot at the beginning of the flash memory and let it initialize the board if I don't add the define I mentioned before? Thank you all for your time and help.
Regards, Javier Ruere
[1] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/25551/focus=25596 [2] http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStarted... [3] http://www.atmel.com/dyn/resources/prod_documents/UBootFlashProgramming.zip [4] http://www.at91.com/www/phpBB2_mirror/viewtopic.php4?t=1300&highlight=at...