abstract.txt

来自「开发板AT91SAM9260-EK的测试程序」· 文本 代码 · 共 41 行

SAM9260 DF        P1056              CS1
SAM9260 DataFlash Page 1056 bytes on Chip Select 1

The 2-nd level Bootloader for Atmel AT91SAM9260 
running from External DataFlash (Page Size 1056 
Bytes, eg. AT45DB642D) using Chip Select 1 for 
DataFlash interfacing

It downloads to first 16.5kB of DataFlash.
1-st level bootloader that is in ROM of 
AT91SAM9260 first downloads this 2-nd level 
bootloader to internal RAM and starts it.

2-nd level bootloader's main function is to 
copy user program from DataFlash to 
External SDRAM and start it.

Just select Flash -> Download to download it 
to DataFlash.

Notes:
  - to erase Bootloader just press "BP4" button 
    on the board while power-up

DataFlash Organization:

0x00000000 _ ____________________________
            |                            |
            |   2-nd Level Bootloader    |
            |                            |
0x00001000 -| - - - - - - - - - - - - - -|
            |                            |
            :  Reserved for future use   :
            :                            :
            |                            |
0x00004200 -|============================|
            |                            |
            |       User Program         |
            :                            :
            :                            :
0x00840000 _|____________________________|