 | | From: | funkymunky | | Subject: | at91rm9200:starting up with only the default bootloader | | Date: | 3 Jan 2005 01:54:21 -0800 |
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 | Hi,
im trying to run a simple program that toggles the pio_c pins on and
off. The board i have is a plain one, with no external ram for the
chip; it starts up, the default boot program takes teh program to run
from the debug pins thru a serial cable connected to the computer where
im sending the file thru hyper terminal.
Im just loading the PIO registers with the appropriate values to reset
the last 4 pins of PIO_C. but its not working. do i also need to setup
the PMC?? i dont think so because im not using the pio pins for input!
im also not using any startup file or anything. do i need anything
between the time where the board boots up and the code is ready to run?
thanx
Mayank
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| | From: | Mayank Kaushik | | Subject: | Re: at91rm9200:starting up with only the default bootloader | | Date: | 4 Jan 2005 22:21:41 -0800 |
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| A bit of self help here:
This is for newbies like me who dont know anything about the
AT91RM9200:
AT91RM9200-BasicBoot-ARM1_2-2_0.zip
download this from the atmel website.
enough code to get you started
regards
Mayank
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| | From: | Marco Cavallini | | Subject: | Re: at91rm9200:starting up with only the default bootloader | | Date: | Wed, 5 Jan 2005 14:06:11 +0100 |
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| > This is for newbies like me who dont know anything about the
> AT91RM9200:
> AT91RM9200-BasicBoot-ARM1_2-2_0.zip
> download this from the atmel website.
> enough code to get you started
Good point ideed,
but consider that these examples are based on U-Boot initialization
Regards
Marco Cavallini
==============================================
Koan s.a.s. - Software Engineering (x86 and ARM)
Linux and WinCE solutions for Embedded and Real-Time Software
Klinux : the embedded distribution for industrial applications
- Microsoft Windows Embedded Partner
- Intel PCA Developer Network member
Via Pascoli, 3 - 24121 Bergamo - ITALIA
Tel. (++39) 035-255.235 - Fax (++39) 178-223.9748
http://www.koansoftware.com - http://www.klinux.org
==============================================
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| | From: | Marco Cavallini | | Subject: | Re: at91rm9200:starting up with only the default bootloader | | Date: | Mon, 3 Jan 2005 14:33:03 +0100 |
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| > im trying to run a simple program that toggles the pio_c pins on and
> off. The board i have is a plain one, with no external ram for the
> chip; it starts up, the default boot program takes teh program to run
> from the debug pins thru a serial cable connected to the computer where
> im sending the file thru hyper terminal.
>
> Im just loading the PIO registers with the appropriate values to reset
> the last 4 pins of PIO_C. but its not working. do i also need to setup
> the PMC?? i dont think so because im not using the pio pins for input!
> im also not using any startup file or anything. do i need anything
> between the time where the board boots up and the code is ready to run?
Because you are not using an operating system
I can only suggest you to take a look at the U-Boot bootloader starting code
http://cvs.sourceforge.net/viewcvs.py/u-boot/u-boot/cpu/at91rm9200/start.S?rev=1.7&view=markup
You should find here some intresting microcontroller initializations that
probably you are missing.
Regards
Marco Cavallini
==============================================
Koan s.a.s. - Software Engineering (x86 and ARM)
Linux and WinCE solutions for Embedded and Real-Time Software
Klinux : the embedded distribution for industrial applications
- Microsoft Windows Embedded Partner
- Intel PCA Developer Network member
Via Pascoli, 3 - 24121 Bergamo - ITALIA
Tel. (++39) 035-255.235 - Fax (++39) 178-223.9748
www.koansoftware.com - www.klinux.org
==============================================
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| | From: | Mayank Kaushik | | Subject: | Re: at91rm9200:starting up with only the default bootloader | | Date: | 5 Jan 2005 06:39:15 -0800 |
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| umm..is that similar to the u-boot code..mayb, as u say, these examples
are based on u-boot initialization techniques..whatever it is, its
simple enough for a beginner. thanks!
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