Hello,

AT91RM9200 is quite specific in that ROM Boot program copies initial bootloader in SRAM (see ch.13 in AT91RM9200 manual):

The main features of the Boot Program are: · Downloads and runs an application from external storage media into internal SRAM · Downloaded code size depends on embedded SRAM size

thus in any way you must use a small (<12Kb) initial bootloader, which in turn loads u-boot from dataflash or NOR flash in SDRAM.

------------------------------------ Best regards, Ivan Embedded Linux Engineer Promwad - www.promwad.com ------------------------------------

Hello everyone, 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 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...

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Message: 2 Date: Thu, 04 Jan 2007 01:05:25 +0100 From: Wolfgang Denk wd@denx.de Subject: Re: [U-Boot-Users] Question about U-Boot in general and the AT91RM9200 in particular To: Javier Ruere javierruere@apexar.com Cc: u-boot-users@lists.sourceforge.net Message-ID: 20070104000525.86CB7352636@atlas.denx.de Content-Type: text/plain; charset=ISO-8859-1

In message 200701031949.26084.javierruere@apexar.com you wrote:

...

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

No, this is NOT correct. If you have NOR flash on your board (which we consider a standard configuration) then U-Boot can boot directly, without a primary bootstrap loader. This is the mode of operation you want to have if your task is to get new hardware running.

...

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?

If "flash memory" means NOR flash, then yes, this will work fine. Actually this is the recommended (by me) mode of operation.

Best regards,

Wolfgang Denk

-- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de "An organization dries up if you don't challenge it with growth." - Mark Shepherd, former President and CEO of Texas Instruments

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